PHP array_udiff_assoc () function
Examples
Compare two arrays of keys and values (using the built-in function that compares keys using a 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"=>"red","b"=>"blue","c"=>"green");
$result=array_udiff_assoc($a1,$a2,"myfunction");
print_r($result);
?>
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"=>"red","b"=>"blue","c"=>"green");
$result=array_udiff_assoc($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 values, and returns the set difference.
Note: This function uses the built-in function that compares keys using a user-defined function that compares keys!
This function compares two (or more) of the array keys and values, 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.) the key names and values.
grammar
array_udiff_assoc( 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 key names and values. |
|---|---|
| PHP version: | 5+ |
Complete PHP Array Reference