mysql_fetch_array

(PHP 4, PHP 5)

mysql_fetch_array — Fetch a result row as an associative array, a numeric array, or both

Avviso

Questa enstensione deprecata da PHP 5.5.0, e sarà rimossa in futuro. Al suo posto, usare l'estensione MySQLi o PDO_MySQL. Vedere anche la guida MySQL: scelta dell'API e le FAQ relative per ulteriori informazioni. Le alternative a questa funzione includono:

Descrizione

mysql_fetch_array(resource $result, int $result_type = MYSQL_BOTH): array

Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.

Elenco dei parametri

result: The risultato resource che che viene calcolato. Questo risultato deriva dal una chiamata a mysql_query().
result_type: The type of array that is to be fetched. It's a constant and can take the following values: MYSQL_ASSOC, MYSQL_NUM, and MYSQL_BOTH.

Valori restituiti

Returns an array of strings that corresponds to the fetched row, or false if there are no more rows. The type of returned array depends on how result_type is defined. By using MYSQL_BOTH (default), you'll get an array with both associative and number indices. Using MYSQL_ASSOC, you only get associative indices (as mysql_fetch_assoc() works), using MYSQL_NUM, you only get number indices (as mysql_fetch_row() works).

If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the same name, you must use the numeric index of the column or make an alias for the column. For aliased columns, you cannot access the contents with the original column name.

Esempi

Example #1 Query with aliased duplicate field names

SELECT table1.field AS foo, table2.field AS bar FROM table1, table2

Example #2 mysql_fetch_array() with MYSQL_NUM

<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
    die("Could not connect: " . mysql_error());
mysql_select_db("mydb");

$result = mysql_query("SELECT id, name FROM mytable");

while ($row = mysql_fetch_array($result, MYSQL_NUM)) {
    printf("ID: %s  Name: %s", $row[0], $row[1]);  
}

mysql_free_result($result);
?>

Example #3 mysql_fetch_array() with MYSQL_ASSOC

<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
    die("Could not connect: " . mysql_error());
mysql_select_db("mydb");

$result = mysql_query("SELECT id, name FROM mytable");

while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
    printf("ID: %s  Name: %s", $row["id"], $row["name"]);
}

mysql_free_result($result);
?>

Example #4 mysql_fetch_array() with MYSQL_BOTH

<?php
mysql_connect("localhost", "mysql_user", "mysql_password") or
    die("Could not connect: " . mysql_error());
mysql_select_db("mydb");

$result = mysql_query("SELECT id, name FROM mytable");

while ($row = mysql_fetch_array($result, MYSQL_BOTH)) {
    printf ("ID: %s  Name: %s", $row[0], $row["name"]);
}

mysql_free_result($result);
?>

Note

Nota: Performance

An important thing to note is that using mysql_fetch_array() is not significantly slower than using mysql_fetch_row(), while it provides a significant added value.

Nota: I nomi dei campi restituiti da questa funzione sono case-sensitive.

Nota: Questa funzione imposta i campio NULL al valore PHP null.

Vedere anche:

mysql_fetch_row() - Get a result row as an enumerated array
mysql_fetch_assoc() - Fetch a result row as an associative array
mysql_data_seek() - Move internal result pointer
mysql_query() - Send a MySQL query

Found A Problem?

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 2 notes

down

robjohnson at black-hole dot com ¶

22 years ago

Benchmark on a table with 38567 rows:

mysql_fetch_array
MYSQL_BOTH: 6.01940000057 secs
MYSQL_NUM: 3.22173595428 secs 
MYSQL_ASSOC: 3.92950594425 secs 

mysql_fetch_row: 2.35096800327 secs 
mysql_fetch_assoc: 2.92349803448 secs 

As you can see, it's twice as effecient to fetch either an array or a hash, rather than getting both.  it's even faster to use fetch_row rather than passing fetch_array MYSQL_NUM, or fetch_assoc rather than fetch_array MYSQL_ASSOC.  Don't fetch BOTH unless you really need them, and most of the time you don't.

down

KingIsulgard ¶

16 years ago

I have found a way to put all results from the select query in an array in one line.

// Read records
$result = mysql_query("SELECT * FROM table;") or die(mysql_error());
    
// Put them in array
for($i = 0; $array[$i] = mysql_fetch_assoc($result); $i++) ;
    
// Delete last empty one
array_pop($array);

You need to delete the last one because this will always be empty.

By this you can easily read the entire table to an array and preserve the keys of the table columns. Very handy.

＋add a note