Example
Compare the keys of two arrays (using a user-defined key comparison function), and return the differences:
<?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");
$result=array_diff_ukey($a1,$a2,"myfunction");
print_r($result);
?>
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Definition and Usage
The array_diff_ukey() function compares the keys of two (or more) arrays, and returns the differences.
Note: This function uses a user-defined function to compare the keys!
This function compares the keys of two (or more) arrays, and return an array that contains the entries from array1 that are not present in array2 or array3, etc.
Syntax
array_diff_ukey(array1,array2,array3...,myfunction);
| Parameter | Description |
|---|---|
| array1 | Required. The array to compare from |
| array2 | Required. An array to compare against |
| array3,... | Optional. More arrays to compare against |
| myfunction | Required. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument |
Technical Details
| Return Value: | Returns an array containing the entries from array1 that are not present in any of the other arrays |
|---|---|
| PHP Version: | 5.1+ |
More Examples
Example 1
Compare the keys of three arrays (use a user-defined function to compare the keys), and return the differences:
<?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"=>"black","b"=>"yellow","d"=>"brown");
$a3=array("e"=>"purple","f"=>"white","a"=>"gold");
$result=array_diff_ukey($a1,$a2,$a3,"myfunction");
print_r($result);
?>
Run example »
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