variant_xor

(PHP 5, PHP 7, PHP 8)

variant_xor — 2 つの variant の排他的論理和を計算する

説明

variant_xor(mixed $left, mixed $right): variant

排他的論理和を計算します。

パラメータ

left: 左オペランド。
right: 右オペランド。

注意:
variant に関するすべての計算用関数と同様、この関数のパラメータには PHP のネイティブ型 (整数、文字列、浮動小数点数、boolean あるいは null) あるいは COM、VARIANT、DOTNET クラスのインスタンスが使用できます。 PHP のネイティブ型は、variant クラスのコンストラクタと同じ方法で variant に変換されます。 COM オブジェクトおよび DOTNET オブジェクトはデフォルトプロパティの値を持っており、これを variant の値として使用します。

variant に関する計算関数は、COM ライブラリの同名の関数のラッパーです。これらの関数についての詳細な情報は、MSDN ライブラリでご確認ください。 PHP での関数名は微妙に異なります。たとえば、PHP での関数 variant_add() に対応する関数は、MSDN のドキュメントでは VarAdd() となります。

戻り値

**Variant の XOR 規則**
`left`	`right`	結果
`true`	`true`	`false`
`true`	`false`	`true`
`false`	`true`	`true`
`false`	`false`	`false`
`null`	`null`	`null`

エラー / 例外

失敗時に com_exception をスローします。

参考

variant_or() - 2 つの variant の論理和を計算する
variant_and() - 2 つの variant の論理積を計算し、結果を返す

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User Contributed Notes 3 notes

down

tinelbarb at yahoo dot com ¶

14 years ago

I've been using a lot the VARIANT_XOR function (all the VARIANT functions ar cool) and I was faceing the problem that some custom copilation of PHP, especially LAMP packs, doesn't have the VARANT functions included, so the scripts halts.
I had to find an alternative for those who doesn't have an implamentation of VARIANT_XOR.
I'd love if somebody improve my "A_XOR_B" function by changing the name in "VARIANT_XOR" and to run the original VARIANT_XOR function (being optimized) if it is already in the PHP compilation, else run the custom XOR code.

<?php
function a_xor_b($a=0, $b=0) {
    return ( ($a!=$b) && ($a||$b) ) ? TRUE : FALSE ;
}
?>

If using this function, make sure you use the same type for arguments ;-)

Here is a sample code using it:

<?php
if ( a_xor_b(strlen($column1)>0,strlen($column2)>0) ) {
  $add_and='';
}
if ( !a_xor_b(strlen($column1)>0,strlen($column2)>0 ) && strlen($column1)>0 ) {
  $add_and=' and ';
}
$some_sql_filter=$query_str.' having '.$column1.$add_and.$column2;
?>

The use of VARIANT_XOR was identical.

@PHP TEAM: the VARIANT set is so great :-)

down

-1

tinelbarb at yahoo dot com ¶

14 years ago

I've been using a lot the VARIANT_XOR function (all the VARIANT functions ar cool) and I was faceing the problem that some custom copilation of PHP, especially LAMP packs, doesn't have the VARANT functions included, so the scripts halts.
I had to find an alternative for those who doesn't have an implamentation of VARIANT_XOR.
I'd love if somebody improve my "A_XOR_B" function by changing the name in "VARIANT_XOR" and to run the original VARIANT_XOR function (being optimized) if it is already in the PHP compilation, else run the custom XOR code.

<?php
function a_xor_b($a=0, $b=0) {
    return ( ($a!=$b) && ($a||$b) ) ? TRUE : FALSE ;
}
?>

If using this function, make sure you use the same type for arguments ;-)

Here is a sample code using it:

<?php
if ( a_xor_b(strlen($column1)>0,strlen($column2)>0) ) {
  $add_and='';
}
if ( !a_xor_b(strlen($column1)>0,strlen($column2)>0 ) && strlen($column1)>0 ) {
  $add_and=' and ';
}
$some_sql_filter=$query_str.' having '.$column1.$add_and.$column2;
?>

The use of VARIANT_XOR was identical.

@PHP TEAM: the VARIANT set is so great :-)

down

-1

tinelbarb at yahoo dot com dot RE-MO-VE dot ME ¶

14 years ago

I've been using a lot the VARIANT_XOR function (all the VARIANT functions ar cool) and I was faceing the problem that some custom copilation of PHP, especially LAMP packs, doesn't have the VARANT functions included, so the scripts halts.
I had to find an alternative for those who doesn't have an implamentation of VARIANT_XOR.
I'd love if somebody improve my "A_XOR_B" function by changing the name in "VARIANT_XOR" and to run the original VARIANT_XOR function (being optimized) if it is already in the PHP compilation, else run the custom XOR code.

<?php
function a_xor_b($a=0, $b=0) {
    return ( ($a!=$b) && ($a||$b) ) ? TRUE : FALSE ;
}
?>

If using this function, make sure you use the same type for arguments ;-)

Here is a sample code using it:

<?php
if ( a_xor_b(strlen($column1)>0,strlen($column2)>0) ) {
  $add_and='';
}
if ( !a_xor_b(strlen($column1)>0,strlen($column2)>0 ) && strlen($column1)>0 ) {
  $add_and=' and ';
}
$some_sql_filter=$query_str.' having '.$column1.$add_and.$column2;
?>

The use of VARIANT_XOR was identical.

@PHP TEAM: the VARIANT set is so great :-)

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