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PHP Quiz PHP CertificatePHP array_diff_ukey() Function
Example
Compare the keys of two arrays (use a user-defined function to compare the keys), and return the differences:
<?php
function key_comp_func($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}
$a1=array("red","green","blue","yellow");
$a2=array("red","green","white");
$result=array_diff_ukey($a1,$a2,"key_comp_func");
print_r($result);
?>
function key_comp_func($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}
$a1=array("red","green","blue","yellow");
$a2=array("red","green","white");
$result=array_diff_ukey($a1,$a2,"key_comp_func");
print_r($result);
?>
Run example »
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.
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 associative 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 two associative arrays (use a user-defined function to compare the keys), and return the differences:
<?php
function key_comp_func($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("c"=>"red","d"=>"green","e"=>"blue");
$result=array_diff_ukey($a1,$a2,"key_comp_func");
print_r($result);
?>
function key_comp_func($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("c"=>"red","d"=>"green","e"=>"blue");
$result=array_diff_ukey($a1,$a2,"key_comp_func");
print_r($result);
?>
Run example »
PHP Array Reference
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