Diese Seite bei php.net
The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)
(PHP 5)
variant_xor — Performs a logical exclusion on two variants
The left operand.
The right operand.
Hinweis:
Wie bei allen arithmetischen Variantfunktionen, können die Parameter dieser Funktion entweder native PHP-Typen (Integer, String, Fließkomma, Boolean oder NULL) oder Instanzen einer COM-, VARIANT- oder DOTNET-Klasse sein. Native PHP-Typen werden nach den gleichen Regeln in Varianten umgewandelt wie auch im Konstruktor der VARIANT-Klasse. Für COM- und DOTNET-Objekte wird der Wert ihrer Standardeigenschaft genommen und als Variantenwert genutzt.
Die arithmetischen Variantenfunktionen sind Wrapper für die ähnlich benannten Funktionen der COM-Bibliothek, weiterführende Informationen hierzu finden sie in der MSDN-Bibliothek. Die PHP-Funktionen sind leicht abweichend benannt, so korrespondiert variant_add() in PHP zu VarAdd() in der MSDN-Dokumentation.
| 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 |
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.$column2;
?>
The use of VARIANT_XOR was identical.
@PHP TEAM: the VARIANT set is so great :-)
I've been using a lot the VARIANT_XOR function (all the VARIANT functions ar cool) and I was faceing the problem that some custom copilation of PHP, especially LAMP packs, doesn't have the VARANT functions included, so the scripts halts.
I had to find an alternative for those who doesn't have an implamentation of VARIANT_XOR.
I'd love if somebody improve my "A_XOR_B" function by changing the name in "VARIANT_XOR" and to run the original VARIANT_XOR function (being optimized) if it is already in the PHP compilation, else run the custom XOR code.
<?php
function a_xor_b($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.$column2;
?>
The use of VARIANT_XOR was identical.
@PHP TEAM: the VARIANT set is so great :-)
I've been using a lot the VARIANT_XOR function (all the VARIANT functions ar cool) and I was faceing the problem that some custom copilation of PHP, especially LAMP packs, doesn't have the VARANT functions included, so the scripts halts.
I had to find an alternative for those who doesn't have an implamentation of VARIANT_XOR.
I'd love if somebody improve my "A_XOR_B" function by changing the name in "VARIANT_XOR" and to run the original VARIANT_XOR function (being optimized) if it is already in the PHP compilation, else run the custom XOR code.
<?php
function a_xor_b($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 :-)
Diese Seite bei php.net