variant_xor

(PHP 5, PHP 7, PHP 8)

variant_xor — Performs a logical exclusion on two variants

说明

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

Performs a logical exclusion.

参数

left: The left operand.
right: The right operand.

Note:
对于所有变量运算函数，本函数的参数可以是 PHP 内置的类型（整数，字符串，浮点数，布尔型或者 null），或者是一个 COM，VARIANT 或者 DOTNET 类的实例。PHP 内置类型将会使用和构造variant类相同的规则转换成变量。COM 和 DOTNET 对象的值将会取其默认属性并被当成变量值使用。

变量运算函数是同名函数在 COM 库中的外包；有关此类函数的更多信息参见 MSDN 库。PHP 函数命名有少许区别，例如 PHP 中的 variant_add() 对应于 MSDN 文档中的 VarAdd()。

返回值

**Variant XOR Rules**
If `left` is	If `right` is	then the result is
`true`	`true`	`false`
`true`	`false`	`true`
`false`	`true`	`true`
`false`	`false`	`false`
`null`	`null`	`null`

错误／异常

Throws a com_exception on failure.

参见

variant_or() - Performs a logical disjunction on two variants
variant_and() - Performs a bitwise AND operation between two variants

User Contributed Notes

tinelbarb at yahoo dot com 30-Aug-2010 12:21


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 :-)

tinelbarb at yahoo dot com 30-Aug-2010 12:20


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 :-)

tinelbarb at yahoo dot com dot RE-MO-VE dot ME 30-Aug-2010 12:20


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 :-)