variant_xor

(PHP 5)

variant_xor — Performs a logical exclusion on two variants

Описание

mixed variant_xor ( mixed $left , mixed $right )

Performs a logical exclusion.

Параметри

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

Забележка: Както и при останалите функции за вариантна аритметика, параметрите на тази функция могат да бъдат както от прост тип в PHP (целочислен, низ, плаващ, булев или NULL), така и инстанция някой от класовете COM, VARIANT или DOTNET. Простите типове в PHP ще бъдат преобразувани до варианти според същите правила, използвани от конструктора на класа VARIANT. Обектите COM и DOTNET ще вземат стйността на свойството им по подразбиране и ще използват тази стойност като стойност на варианта.
Функциите за вариантна аритметика са опаковки на именуваните по подобен начин функции в библиотеката COM; за повече информация относно тези функции се консултирайте с библиотеката MSDN. Функциите в PHP са именувани малко по-различно; например variant_add() в PHP отговаря на VarAdd() в документацията на MSDN.

Връщани стойности

**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`

Вж. също

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

Printer

variant_sub

[edit] Last updated: Fri, 18 Sep 2009

add a note User Contributed Notes variant_xor - [3 notes]

down

tinelbarb at yahoo dot com ¶

2 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

tinelbarb at yahoo dot com ¶

2 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

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

2 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 :-)

add a note