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PHP array_udiff () function

PHP Array Reference Complete PHP Array Reference

Examples

Compare two key array (using user-defined comparison function keys), and returns the difference set:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"blue","b"=>"black","e"=>"blue");

$result=array_udiff($a1,$a2,"myfunction");
print_r($result);
?>

Running instance »

Definition and Usage

array_udiff () function is used to compare two (or more) of the array keys, and returns the set difference.

Note: This function uses a user-defined function that compares keys!

This function compares two (or more) key array, and returns a difference of arrays, the array includes all the compared array (array1), but not in any other parameter array (array2 or array3 etc. ) of the key.


grammar

array_udiff( array1,array2,array3...,myfunction )

参数 描述
array1 必需。与其他数组进行比较的第一个数组。
array2 必需。与第一个数组进行比较的数组。
array3,... 可选。与第一个数组进行比较的其他数组。
myfunction 必需。一个定义了可调用比较函数的字符串。如果第一个参数 <, =, > 第二个参数,相应地比较函数必须返回一个 <, =, > 0 的整数。

technical details

return value: Returns a difference of arrays, the array includes all the compared array (array1), but not in any other parameter array (array2 or array3 etc.) in the key.
PHP version: 5.1.0+


More examples

Example 1

Comparison of three key array (using user-defined comparison function keys), and returns the difference set:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue","yellow");
$a2=array("A"=>"red","b"=>"GREEN","yellow","black");
$a3=array("a"=>"green","b"=>"red","yellow","black");

$result=array_udiff($a1,$a2,$a3,"myfunction");
print_r($result);

?>

Running instance »


PHP Array Reference Complete PHP Array Reference