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    strtr

    (PHP 4, PHP 5, PHP 7, PHP 8)

    strtr — 转换字符或替换字串

    说明

    strtr(string $string, string $from, string $to): string

    替代签名（不支持命名参数）：

    strtr(string $string, array $replace_pairs): string

    如果指定三个参数，则该函数返回 string 的副本，from 中所有出现的每个（单字节）字符都已转换为 to 中的相应字符。例如，每次出现的 $from[$n] 都会替换为 $to[$n]，$n 是两个参数中的有效位移(offset)。

    如果 from 与 to 长度不相等，那么忽略两者中较长的多余字符。string 的长度将与返回的长度一样。

    如果指定两个参数，则第二个参数应该是 array('from' => 'to', ...) 形式的 array。返回值是 string，数组中所有所有出现的键都替换为相应的值。首先会尝试最长的键。一旦子字符串被替换，则新值将不会再次搜索。

    在这种情况下，键和值可以是任意长度，前提是没有空值的键；另外，返回值的长度可以跟 string 的长度不同。但是，当所有键的长度相同时，函数最有效。

    参数

    string

    待转换的 string。

    from

    要转成 to 的 string。

    to

    替换 from 的 string。

    replace_pairs

    参数 replace_pairs 可以用来取代 to 和 from ，因为它是 array('from' => 'to', ...) 形式的 array。

    如果 replace_pairs 包含空 string（""）键，将忽略该元素；自 PHP 8.0.0 起，这种情况会引发 E_WARNING。

    返回值

    返回转换后的 string。

    示例

    示例 #1 strtr() 示例

    <?php
    // 在这种形式中，strtr() 进行逐字节转换
    // 因此，假设这里是单字节编码：
    $addr = strtr($addr, "äåö", "aao");
    ?>

    下面的示例展示了仅使用两个参数调用 strtr() 的行为。注意优先替换（没有选择 "h"，因为有更长的匹配项）以及不再搜索已替换的文本。

    示例 #2 使用两个参数的 strtr() 示例

    <?php
    $trans     = array("h" => "-", "hello" => "hi", "hi" => "hello");
    echo     strtr("hi all, I said hello", $trans);
    ?>

    以上示例会输出：

    hello all, I said hi

    两种行为的模式本质上是不同的。使用三个参数，strtr() 将按字节替换；使用两个参数，优先替换更长的子字符串，

    示例 #3 strtr() 行为比较

    <?php
    echo strtr("baab", "ab", "01"),"\n";

    $trans = array("ab" => "01");
    echo     strtr("baab", $trans);
    ?>

    以上示例会输出：

    1001
ba01

    参见

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    用户贡献的备注 32 notes

    up
    118
    evan dot king at NOSPAM dot example dot com
    9 years ago
    Here's an important real-world example use-case for strtr where str_replace will not work or will introduce obscure bugs:

    <?php

    $strTemplate     = "My name is :name, not :name2.";
    $strParams = [
    ':name' => 'Dave',
    'Dave' => ':name2 or :password', // a wrench in the otherwise sensible input
    ':name2' => 'Steve',
    ':pass' => '7hf2348', // sensitive data that maybe shouldn't be here
    ];

    echo     strtr($strTemplate, $strParams);
    // "My name is Dave, not Steve."

    echo str_replace(array_keys($strParams), array_values($strParams), $strTemplate);
    // "My name is Steve or 7hf2348word, not Steve or 7hf2348word2."

    ?>

    Any time you're trying to template out a string and don't necessarily know what the replacement keys/values will be (or fully understand the implications of and control their content and order), str_replace will introduce the potential to incorrectly match your keys because it does not expand the longest keys first.

    Further, str_replace will replace in previous replacements, introducing potential for unintended nested expansions. Doing so can put the wrong data into the "sub-template" or even give users a chance to provide input that exposes data (if they get to define some of the replacement strings).

    Don't support recursive expansion unless you need it and know it will be safe. When you do support it, do so explicitly by repeating strtr calls until no more expansions are occurring or a sane iteration limit is reached, so that the results never implicitly depend on order of your replacement keys. Also make certain that any user input will expanded in an isolated step after any sensitive data is already expanded into the output and no longer available as input.

    Note: using some character(s) around your keys to designate them also reduces the possibility of unintended mangling of output, whether maliciously triggered or otherwise. Thus the use of a colon prefix in these examples, which you can easily enforce when accepting replacement input to your templating/translation system.
    up
    63
    Hayley Watson
    11 years ago
    Since strtr (like PHP's other string functions) treats strings as a sequence of bytes, and since UTF-8 and other multibyte encodings use - by definition - more than one byte for at least some characters, the three-string form is likely to have problems. Use the associative array form to specify the mapping.

    <?php
    // Assuming UTF-8
    $str = 'Äbc Äbc'; // strtr() sees this as nine bytes (including two for each Ä)
    echo strtr($str, 'Ä', 'a'); // The second argument is equivalent to the string "\xc3\x84" so "\xc3" gets replaced by "a" and the "\x84" is ignored

    echo strtr($str, array('Ä' => 'a')); // Works much better
    ?>
    up
    19
    allixsenos at gmail dot com
    15 years ago
    fixed "normaliza" functions written below to include Slavic Latin characters... also, it doesn't return lowercase any more (you can easily get that by applying strtolower yourself)...

    also, renamed to normalize()

    <?php

    function normalize ($string) {
    $table = array(
    'Š'=>'S', 'š'=>'s', 'Đ'=>'Dj', 'đ'=>'dj', 'Ž'=>'Z', 'ž'=>'z', 'Č'=>'C', 'č'=>'c', 'Ć'=>'C', 'ć'=>'c',
    'À'=>'A', 'Á'=>'A', 'Â'=>'A', 'Ã'=>'A', 'Ä'=>'A', 'Å'=>'A', 'Æ'=>'A', 'Ç'=>'C', 'È'=>'E', 'É'=>'E',
    'Ê'=>'E', 'Ë'=>'E', 'Ì'=>'I', 'Í'=>'I', 'Î'=>'I', 'Ï'=>'I', 'Ñ'=>'N', 'Ò'=>'O', 'Ó'=>'O', 'Ô'=>'O',
    'Õ'=>'O', 'Ö'=>'O', 'Ø'=>'O', 'Ù'=>'U', 'Ú'=>'U', 'Û'=>'U', 'Ü'=>'U', 'Ý'=>'Y', 'Þ'=>'B', 'ß'=>'Ss',
    'à'=>'a', 'á'=>'a', 'â'=>'a', 'ã'=>'a', 'ä'=>'a', 'å'=>'a', 'æ'=>'a', 'ç'=>'c', 'è'=>'e', 'é'=>'e',
    'ê'=>'e', 'ë'=>'e', 'ì'=>'i', 'í'=>'i', 'î'=>'i', 'ï'=>'i', 'ð'=>'o', 'ñ'=>'n', 'ò'=>'o', 'ó'=>'o',
    'ô'=>'o', 'õ'=>'o', 'ö'=>'o', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ý'=>'y', 'ý'=>'y', 'þ'=>'b',
    'ÿ'=>'y', 'Ŕ'=>'R', 'ŕ'=>'r',
    );

    return     strtr($string, $table);
    }

    ?>
    up
    5
    horak.jan AT centrum.cz
    17 years ago
    Here is a function to convert middle-european windows charset (cp1250) to the charset, that php script is written in:

    <?php
    function cp1250_to_utf2($text){
    $dict = array(chr(225) => 'á', chr(228) => 'ä', chr(232) => 'č', chr(239) => 'ď',
    chr(233) => 'é', chr(236) => 'ě', chr(237) => 'í', chr(229) => 'ĺ', chr(229) => 'ľ',
    chr(242) => 'ň', chr(244) => 'ô', chr(243) => 'ó', chr(154) => 'š', chr(248) => 'ř',
    chr(250) => 'ú', chr(249) => 'ů', chr(157) => 'ť', chr(253) => 'ý', chr(158) => 'ž',
    chr(193) => 'Á', chr(196) => 'Ä', chr(200) => 'Č', chr(207) => 'Ď', chr(201) => 'É',
    chr(204) => 'Ě', chr(205) => 'Í', chr(197) => 'Ĺ', chr(188) => 'Ľ', chr(210) => 'Ň',
    chr(212) => 'Ô', chr(211) => 'Ó', chr(138) => 'Š', chr(216) => 'Ř', chr(218) => 'Ú',
    chr(217) => 'Ů', chr(141) => 'Ť', chr(221) => 'Ý', chr(142) => 'Ž',
    chr(150) => '-');
    return     strtr($text, $dict);
    }
    ?>
    up
    6
    Annubis
    6 years ago
    Since I was having a lot of trouble finding a multibyte safe strtr and the solutions I found didn't help, I came out with this function, I don't know how it works with non latin chars but it works for me using spanish/french utf8, I hope it helps someone...
    <?php
    if(!function_exists('mb_strtr')) {
    function     mb_strtr ($str, $from, $to = null) {
    if(    is_array($from)) {
    $from = array_map('utf8_decode', $from);
    $from = array_map('utf8_decode', array_flip ($from));
    return     utf8_encode (strtr (utf8_decode ($str), array_flip ($from)));
    }
    return     utf8_encode (strtr (utf8_decode ($str), utf8_decode($from), utf8_decode ($to)));
    }
    }
    ?>
    up
    8
    Michael Schuijff
    13 years ago
    I found that this approach is often faster than strtr() and won't change the same thing in your string twice (as opposed to str_replace(), which will overwrite things in the order of the array you feed it with):

    <?php
    function replace ($text, $replace) {
    $keys = array_keys($replace);
    $length = array_combine($keys, array_map('strlen', $keys));
    arsort($length);

    $array[] = $text;
    $count = 1;
    reset($length);
    while (    $key = key($length)) {
    if (    strpos($text, $key) !== false) {
    for (    $i = 0; $i < $count; $i += 2) {
    if ((    $pos = strpos($array[$i], $key)) === false) continue;
    array_splice($array, $i, 1, array(substr($array[$i], 0, $pos), $replace[$key], substr($array[$i], $pos + strlen($key))));
    $count += 2;
    }
    }
    next($length);
    }
    return     implode($array);
    }
    ?>
    up
    12
    dot dot dot dot dot alexander at gmail dot com
    16 years ago
    OK, I debugged the function (had some errors)
    Here it is:

    if(!function_exists("stritr")){
    function stritr($string, $one = NULL, $two = NULL){
    /*
    stritr - case insensitive version of strtr
    Author: Alexander Peev
    Posted in PHP.NET
    */
    if( is_string( $one ) ){
    $two = strval( $two );
    $one = substr( $one, 0, min( strlen($one), strlen($two) ) );
    $two = substr( $two, 0, min( strlen($one), strlen($two) ) );
    $product = strtr( $string, ( strtoupper($one) . strtolower($one) ), ( $two . $two ) );
    return $product;
    }
    else if( is_array( $one ) ){
    $pos1 = 0;
    $product = $string;
    while( count( $one ) > 0 ){
    $positions = array();
    foreach( $one as $from => $to ){
    if( ( $pos2 = stripos( $product, $from, $pos1 ) ) === FALSE ){
    unset( $one[ $from ] );
    }
    else{
    $positions[ $from ] = $pos2;
    }
    }
    if( count( $one ) <= 0 )break;
    $winner = min( $positions );
    $key = array_search( $winner, $positions );
    $product = ( substr( $product, 0, $winner ) . $one[$key] . substr( $product, ( $winner + strlen($key) ) ) );
    $pos1 = ( $winner + strlen( $one[$key] ) );
    }
    return $product;
    }
    else{
    return $string;
    }
    }/* endfunction stritr */
    }/* endfunction exists stritr */
    up
    5
    elloromtz at gmail dot com
    14 years ago
    If you supply 3 arguments and the 2nd is an array, strtr will search the "A" from "Array" (because you're treating it as a scalar string) and replace it with the 3rd argument:

    strtr('Analogy', array('x'=>'y'), '_'); //'_nalogy'

    so in reality the above code has the same affect as:

    strtr('Analogy', 'A' , '_');
    up
    6
    dcz at phpbb-seo dot com
    11 years ago
    strstr will issue a notice when $replace_pairs contains an array, even unused, with php 5.5.0.

    It was not the case with version at least up to 5.3.2, but I'm not sure the notice was added with exactly 5.5.0.

    <?php
    $str     = 'hi all, I said hello';
    $replace_pairs = array(
    'all' => 'everybody',
    'unused' => array('somtehing', 'something else'),
    'hello' => 'hey',
    );
    // php 5.5.0 Notice: Array to string conversion in test.php on line 8
    echo strtr($str, $replace_pairs); // hi everybody, I said hey
    ?>

    since the result is still correct, @strstr seems a working solution.
    up
    6
    Tedy
    12 years ago
    Since strtr() is twice faster than strlwr I decided to write my own lowering function which also handles UTF-8 characters.

    <?php

    function strlwr($string, $utf = 1)
    {
    $latin_letters = array('Ă' => 'a',
    'Â' => 'a',
    'Î' => 'i',
    'Ș' => 's',
    'Ş' => 's',
    'Ț' => 't',
    'Ţ' => 't');

    $utf_letters = array('Ă' => 'ă',
    'Â' => 'â',
    'Î' => 'î',
    'Ș' => 'ș',
    'Ş' => 'ş',
    'Ț' => 'ț',
    'Ţ' => 'ţ');

    $letters = array('A' => 'a',
    'B' => 'b',
    'C' => 'c',
    'D' => 'd',
    'E' => 'e',
    'F' => 'f',
    'G' => 'g',
    'H' => 'h',
    'I' => 'i',
    'J' => 'j',
    'K' => 'k',
    'L' => 'l',
    'M' => 'm',
    'N' => 'n',
    'O' => 'o',
    'P' => 'p',
    'Q' => 'q',
    'R' => 'r',
    'S' => 's',
    'T' => 't',
    'U' => 'u',
    'V' => 'v',
    'W' => 'w',
    'X' => 'x',
    'Y' => 'y',
    'Z' => 'z');

    return (    $utf == 1) ? strtr($string, array_merge($utf_letters, $letters)) : strtr($string, array_merge($latin_letters, $letters));
    }

    ?>

    This allows you to lower every character (even UTF-8 ones) if you don't set the second parameter, or just lower the UTF-8 ones into their specific latin characters (used when making friendly-urls for example).

    I used romanian characters but, of course, you can add your own local characters.

    Feel free to use/modify this function as you wish. Hope it helps.
    up
    4
    troelskn at gmail dot com
    16 years ago
    Here's another transcribe function. This one converts cp1252 (aka. Windows-1252) into iso-8859-1 (aka. latin1, the default PHP charset). It only transcribes the few exotic characters, which are unique to cp1252.

    function transcribe_cp1252_to_latin1($cp1252) {
    return strtr(
    $cp1252,
    array(
    "\x80" => "e", "\x81" => " ", "\x82" => "'", "\x83" => 'f',
    "\x84" => '"', "\x85" => "...", "\x86" => "+", "\x87" => "#",
    "\x88" => "^", "\x89" => "0/00", "\x8A" => "S", "\x8B" => "<",
    "\x8C" => "OE", "\x8D" => " ", "\x8E" => "Z", "\x8F" => " ",
    "\x90" => " ", "\x91" => "`", "\x92" => "'", "\x93" => '"',
    "\x94" => '"', "\x95" => "*", "\x96" => "-", "\x97" => "--",
    "\x98" => "~", "\x99" => "(TM)", "\x9A" => "s", "\x9B" => ">",
    "\x9C" => "oe", "\x9D" => " ", "\x9E" => "z", "\x9F" => "Y"));
    up
    4
    martin[dot]pelikan[at]gmail[dot]com
    18 years ago
    // if you are upset with windows' ^M characters at the end of the line,
    // these two lines are for you:
    $trans = array("\x0D" => "");
    $text = strtr($orig_text,$trans);

    // note that ctrl+M (in vim known as ^M) is hexadecimally 0x0D
    up
    5
    Sidney Ricardo
    16 years ago
    This work fine to me:

    <?php
    function normaliza ($string){
    $a = 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ
    ßàáâãäåæçèéêëìíîïðñòóôõöøùúûýýþÿŔŕ'    ;
    $b = 'aaaaaaaceeeeiiiidnoooooouuuuy
    bsaaaaaaaceeeeiiiidnoooooouuuyybyRr'    ;
    $string = utf8_decode($string);
    $string = strtr($string, utf8_decode($a), $b);
    $string = strtolower($string);
    return     utf8_encode($string);
    }
    ?>
    up
    4
    dot dot dot dot dot alexander at gmail dot com
    16 years ago
    Here is the stritr I always needed... I wrote it in 15 minutes... But only after the idea struck me. Hope you find it helpful, and enjoy...
    <?php
    if(!function_exists("stritr")){
    function     stritr($string, $one = NULL, $two = NULL){
    /*
    stritr - case insensitive version of strtr
    Author: Alexander Peev
    Posted in PHP.NET
    */
    if( is_string( $one ) ){
    $two = strval( $two );
    $one = substr( $one, 0, min( strlen($one), strlen($two) ) );
    $two = substr( $two, 0, min( strlen($one), strlen($two) ) );
    $product = strtr( $string, ( strtoupper($one) . strtolower($one) ), ( $two . $two ) );
    return     $product;
    }
    else if(     is_array( $one ) ){
    $pos1 = 0;
    $product = $string;
    while(     count( $one ) > 0 ){
    $positions = array();
    foreach(     $one as $from => $to ){
    if( (     $pos2 = stripos( $product, $from, $pos1 ) ) === FALSE ){
    unset(     $one[ $from ] );
    }
    else{
    $positions[ $from ] = $pos2;
    }
    }
    $winner = min( $positions );
    $key = array_search( $winner, $positions );
    $product = ( substr( $product, 0, $winner ) . $positions[$key] . substr( $product, ( $winner + strlen($key) ) ) );
    $pos1 = ( $winner + strlen( $positions[$key] ) );
    }
    return     $product;
    }
    else{
    return     $string;
    }
    }    /* endfunction stritr */
    }/* endfunction exists stritr */
    ?>
    up
    3
    doydoy44
    11 years ago
    The example of VOVA (http://www.php.net/manual/fr/function.strtr.php#111968) is good but the result is false:
    His example dont replace the string.

    <?php
    function f1_strtr() {
    for(    $i=0; $i<1000000; ++$i) {
    $new_string = strtr("aboutdealers.com", array(".com" => ""));
    }
    return     $new_string;
    }
    function     f2_str_replace() {
    for(    $i=0; $i<1000000; ++$i) {
    $new_string = str_replace( ".com", "", "aboutdealers.com");
    }
    return     $new_string;
    }
    $start = microtime(true);
    $strtr = f1_strtr();
    $stop = microtime(true);
    $time_strtr = $stop - $start;

    $start = microtime(true);
    $str_replace = f2_str_replace();
    $stop = microtime(true);
    $time_str_replace = $stop - $start;


    echo     'time strtr : ' . $time_strtr . "\tresult :" . $strtr . "\n";
    echo     'time str_replace : ' . $time_str_replace . "\tresult :" . $str_replace . "\n";
    echo     'time strtr > time str_replace => ' . ($time_strtr > $time_str_replace);
    ?>
    --------------------------------------
    time strtr : 3.9719619750977 result :aboutdealers
    time str_replace : 2.9930369853973 result :aboutdealers
    time strtr > time str_replace => 1

    str_replace is faster than strtr
    up
    3
    qeremy [atta] gmail [dotta] com
    11 years ago
    Weird, but strtr corrupting chars, if used like below and if file is encoded in UTF-8;

    <?php
    $str     = 'Äbc Äbc';
    echo     strtr($str, 'Ä', 'a');
    // output: a�bc a�bc
    ?>

    And a simple solution;

    <?php
    function strtr_unicode($str, $a = null, $b = null) {
    $translate = $a;
    if (!    is_array($a) && !is_array($b)) {
    $a = (array) $a;
    $b = (array) $b;
    $translate = array_combine(
    array_values($a),
    array_values($b)
    );
    }
    // again weird, but accepts an array in this case
    return strtr($str, $translate);
    }

    $str = 'Äbc Äbc';
    echo     strtr($str, 'Ä', 'a') ."\n";
    echo     strtr_unicode($str, 'Ä', 'a') ."\n";
    echo     strtr_unicode($str, array('Ä' => 'a')) ."\n";
    // outputs
    // a�bc a�bc
    // abc abc
    // abc abc
    ?>
    up
    2
    joeldegan AT yahoo
    18 years ago
    After battling with strtr trying to strip out MS word formatting from things pasted into forms I ended up coming up with this..

    it strips ALL non-standard ascii characters, preserving html codes and such, but gets rid of all the characters that refuse to show in firefox.

    If you look at this page in firefox you will see a ton of "question mark" characters and so it is not possible to copy and paste those to remove them from strings.. (this fixes that issue nicely, though I admit it could be done a bit better)

    <?
    function fixoutput($str){
    $good[] = 9; #tab
    $good[] = 10; #nl
    $good[] = 13; #cr
    for($a=32;$a<127;$a++){
    $good[] = $a;
    }
    $len = strlen($str);
    for($b=0;$b < $len+1; $b++){
    if(in_array(ord($str[$b]), $good)){
    $newstr .= $str[$b];
    }//fi
    }//rof
    return $newstr;
    }
    ?>
    up
    1
    Romain
    10 years ago
    <?php
    /**
    * Clean string,
    * minimize and remove space, accent and other
    *
    * @param string $string
    * @return string
    */
    public function mb_strtoclean($string){
    // Valeur a nettoyer (conversion)
    $unwanted_array = array( 'Š'=>'S', 'š'=>'s', 'Ž'=>'Z', 'ž'=>'z', 'À'=>'A', 'Á'=>'A', 'Â'=>'A', 'Ã'=>'A', 'Ä'=>'A', 'Å'=>'A', 'Æ'=>'A', 'Ç'=>'C', 'È'=>'E', 'É'=>'E',
    'Ê'=>'E', 'Ë'=>'E', 'Ì'=>'I', 'Í'=>'I', 'Î'=>'I', 'Ï'=>'I', 'Ñ'=>'N', 'Ò'=>'O', 'Ó'=>'O', 'Ô'=>'O', 'Õ'=>'O', 'Ö'=>'O', 'Ø'=>'O', 'Ù'=>'U',
    'Ú'=>'U', 'Û'=>'U', 'Ü'=>'U', 'Ý'=>'Y', 'Þ'=>'B', 'ß'=>'Ss', 'à'=>'a', 'á'=>'a', 'â'=>'a', 'ã'=>'a', 'ä'=>'a', 'å'=>'a', 'æ'=>'a', 'ç'=>'c',
    'è'=>'e', 'é'=>'e', 'ê'=>'e', 'ë'=>'e', 'ì'=>'i', 'í'=>'i', 'î'=>'i', 'ï'=>'i', 'ð'=>'o', 'ñ'=>'n', 'ò'=>'o', 'ó'=>'o', 'ô'=>'o', 'õ'=>'o',
    'ö'=>'o', 'ø'=>'o', 'ù'=>'u', 'ú'=>'u', 'û'=>'u', 'ý'=>'y', 'ý'=>'y', 'þ'=>'b', 'ÿ'=>'y',
    ' ' => '', '_' => '', '-' => '', '.'=> '', ',' => '', ';' => '');

    return     mb_strtolower(strtr($string, $unwanted_array ));
    }
    up
    1
    gabi at unica dot edu
    22 years ago
    To convert special chars to their html entities strtr you can use strtr in conjunction with get_html_translation_table(HTML_ENTITIES) :

    $trans = get_html_translation_table(HTML_ENTITIES);
    $html_code = strtr($html_code, $trans);

    This will replace in $html_code the ? by &Aacute; , etc.
    up
    1
    tomhmambo at seznam dot cz
    18 years ago
    <?
    // Windows-1250 to ASCII
    // This function replace all Windows-1250 accent characters with
    // thier non-accent ekvivalents. Useful for Czech and Slovak languages.

    function win2ascii($str) {

    $str = StrTr($str,
    "\xE1\xE8\xEF\xEC\xE9\xED\xF2",
    "\x61\x63\x64\x65\x65\x69\x6E");

    $str = StrTr($str,
    "\xF3\xF8\x9A\x9D\xF9\xFA\xFD\x9E\xF4\xBC\xBE",
    "\x6F\x72\x73\x74\x75\x75\x79\x7A\x6F\x4C\x6C");

    $str = StrTr($str,
    "\xC1\xC8\xCF\xCC\xC9\xCD\xC2\xD3\xD8",
    "\x41\x43\x44\x45\x45\x49\x4E\x4F\x52");

    $str = StrTr($str,
    "\x8A\x8D\xDA\xDD\x8E\xD2\xD9\xEF\xCF",
    "\x53\x54\x55\x59\x5A\x4E\x55\x64\x44");

    return $str;
    }
    ?>
    up
    0
    Anonymous
    19 years ago
    If you are going to call strtr a lot, consider using str_replace instead, as it is much faster. I cut execution time in half just by doing this.

    <?
    // i.e. instead of:
    $s=strtr($s,$replace_array);

    // use:
    foreach($replace_array as $key=>$value) $s=str_replace($key,$value,$s);
    ?>
    up
    0
    ktogias at math dot upatras dot gr
    20 years ago
    This function is usefull for
    accent insensitive regexp
    searches into greek (iso8859-7) text:
    (Select View -> Character Encoding -> Greek (iso8859-7)
    at your browser to see the correct greek characters)

    function gr_regexp($mystring){
    $replacement=array(
    array("?","?","?","?"),
    array("?","?","?","?"),
    array("?","?","?","?"),
    array("?","?","?","?","?","?"),
    array("?","?","?","?"),
    array("?","?","?","?","?","?"),
    array("?","?","?","?")
    );
    foreach($replacement as $group){
    foreach($group as $character){
    $exp="[";
    foreach($group as $expcharacter){
    $exp.=$expcharacter;
    }
    $exp.="]";
    $trans[$character]=$exp;
    }
    }
    $temp=explode(" ", $mystring);
    for ($i=0;$i<sizeof($temp);$i++){
    $temp[$i]=strtr($temp[$i],$trans);
    $temp[$i]=addslashes($temp[$i]);
    }
    return implode(".*",$temp);
    }

    $match=gr_regexp("????????????????????? ??? ????????");

    //The next query string can be sent to MySQL
    through mysql_query()
    $query=
    "Select `column` from `table` where `column2` REGEXP
    '".$match."'";
    up
    0
    j at pureftpd dot org
    20 years ago
    Here's a very useful function to translate Microsoft characters into Latin 15, so that people won't see any more square instead of characters in web pages .

    function demicrosoftize($str) {
    return strtr($str,
    "\x82\x83\x84\x85\x86\x87\x89\x8a" .
    "\x8b\x8c\x8e\x91\x92\x93\x94\x95" .
    "\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f",
    "'f\".**^\xa6<\xbc\xb4''" .
    "\"\"---~ \xa8>\xbd\xb8\xbe");
    }
    up
    0
    bisqwit at iki dot fi
    22 years ago
    #!/bin/sh
    # This shell script generates a strtr() call
    # to translate from a character set to another.
    # Requires: gnu recode, perl, php commandline binary
    #
    # Usage:
    # Set set1 and set2 to whatever you prefer
    # (multibyte character sets are not supported)
    # and run the script. The script outputs
    # a strtr() php code for you to use.
    #
    # Example is set to generate a
    # cp437..latin9 conversion code.
    #
    set1=cp437
    set2=iso-8859-15
    result="`echo '<? for($c=32;$c<256;$c++)'\
    'echo chr($c);'\
    |php -q|recode -f $set1..$set2`"
    echo "// This php function call converts \$string in $set1 to $set2";
    cat <<EOF | php -q
    <?php
    \$set1='`echo -n "$result"\
    |perl -pe "s/([\\\\\'])/\\\\\\\\\\$1/g"`'    ;
    \    $set2='`echo -n "$result"|recode -f $set2..$set1\
    |perl -pe "s/([\\\\\'])/\\\\\\\\\\$1/g"`'    ;
    \    $erase=array();
    \    $l=strlen(\$set1);
    for(\    $c=0;\$c<\$l;++\$c)
    if(\    $set1[\$c]==\$set2[\$c])\$erase[\$set1[\$c]]='';
    if(    count(\$erase))
    {
    \    $set1=strtr(\$set1,\$erase);
    \    $set2=strtr(\$set2,\$erase);
    }
    if(!    strlen(\$set1))echo 'IRREVERSIBLE';else
    echo     "strtr(\\\$string,\n '",
    ereg_replace('([\\\\\\'])', '\\\\\\1', \$set2),
    "'    ,\n '",
    ereg_replace('    ([\\\\\\'])', '\\\\\\1', \$set1),
    "');";
    EOF
    up
    -1
    ajitsingh4u at gmail dot com
    17 years ago
    /**
    * Replaces special characters with single quote,double quote and comma for charset iso-8859-1
    *
    * replaceSpecialChars()
    * @param string $str
    * @return string
    */
    function replaceSpecialChars($str)
    {
    //`(96) ’(130) „(132) ‘(145) ’(146) “(147) ”(148) ´(180) // equivalent ascii values of these characters.
    $str = strtr($str, "`’„‘’´", "'','''");
    $str = strtr($str, '“”', '""');
    return $str;
    }
    up
    -1
    patrick at p-roocks dot de
    19 years ago
    As Daijoubu suggested use str_replace instead of this function for large arrays/subjects. I just tried it with a array of 60 elements, a string with 8KB length, and the execution time of str_replace was faster at factor 20!

    Patrick
    up
    -1
    ru dot dy at gmx dot net
    19 years ago
    Posting umlaute here resulted in a mess. Heres a version of the same function that works with preg_replace only:
    <?php
    function getRewriteString($sString) {
    $string = strtolower(htmlentities($sString));
    $string = preg_replace("/&(.)(uml);/", "$1e", $string);
    $string = preg_replace("/&(.)(acute|cedil|circ|ring|tilde|uml);/", "$1", $string);
    $string = preg_replace("/([^a-z0-9]+)/", "-", html_entity_decode($string));
    $string = trim($string, "-");
    return     $string;
    }
    ?>
    up
    -1
    symlink23-remove-my-spleen at yahoo dot com
    22 years ago
    As noted in the str_rot13 docs, some servers don't provide the str_rot13() function. However, the presence of strtr makes it easy to build your own facsimile thereof:

    if (!function_exists('str_rot13')) {
    function str_rot13($str) {
    $from = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $to = 'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM';

    return strtr($str, $from, $to);
    }
    }

    This is suitable for very light "encryption" such as hiding email addressess from spambots (then unscrambling them in a mail class, for example).

    $mail_to=str_rot13("$mail_to");
    up
    -1
    erik at eldata dot se
    23 years ago
    As an alternative to the not-yet-existing function stritr mentioned in the first note above You can easily do this:

    strtr("abc","ABCabc","xyzxyz")

    or more general:

    strtr("abc",
    strtoupper($fromchars).strtolower($fromchars),
    $tochars.$tochars);

    Just a thought.
    up
    -1
    Anonymous
    4 years ago
    The string, string form cannot remove characters, but the array form can.
    up
    -2
    tekintian#gmail.com
    4 years ago
    /**
    *
    * 将一个字串中含有全角的数字字符、字母、空格或'%+-()'字符转换为相应半角字符
    * @author tekintian#gmail.com
    * @param string $str 待转换字串
    *
    * @return string $str 处理后字串
    */
    function str2byte_convert(String $str):String {
    $arr = array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4',
    '５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',
    'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E',
    'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',
    'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O',
    'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',
    'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y',
    'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',
    'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i',
    'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',
    'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's',
    'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',
    'ｙ' => 'y', 'ｚ' => 'z',
    '（' => '(', '）' => ')', '〔' => '[', '〕' => ']', '【' => '[',
    '】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',
    '‘' => '[', '’' => ']', '｛' => '{', '｝' => '}', '《' => '<',
    '》' => '>',
    '％' => '%', '＋' => '+', '—' => '-', '－' => '-', '～' => '-',
    '：' => ':', '。' => '.', '、' => ',', '，' => '.', '、' => '.',
    '；' => ',', '？' => '?', '！' => '!', '…' => '-', '‖' => '|',
    '”' => '"', '’' => '`', '‘' => '`', '｜' => '|', '〃' => '"',
    '　' => ' ');

    return strtr($str, $arr);
    }
    up
    -3
    Fernando "Malk" Piancastelli
    21 years ago
    Here's a function to replace linebreaks to html <p> tags. This was initially designed to receive a typed text by a form in a "insert new notice" page and put in a database, then a "notice" page could get the text preformatted with paragraph tags instead of linebreaks that won't appear on browser. The function also removes repeated linebreaks the user may have typed in the form.

    function break_to_tags(&$text) {

    // find and remove repeated linebreaks

    $double_break = array("\r\n\r\n" => "\r\n");
    do {
    $text = strtr($text, $double_break);
    $position = strpos($text, "\r\n\r\n");
    } while ($position !== false);

    // find and replace remanescent linebreaks by <p> tags

    $change = array("\r\n" => "<p>");
    $text = strtr($text, $change);
    }

    []'s
    Fernando
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