Home > Article > Backend Development > PHP uses the user-defined function array_intersect_ukey() to compare key names
Example
Compare the key names of two arrays (using user custom function to compare key names) and return the intersection:
<?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"); $result=array_intersect_ukey($a1,$a2,"myfunction"); print_r($result); ?>
Definition and usage
array_intersect_ukey() function is used to compare the key names of two (or more) arrays and return the intersection.
Note: This function uses a user-defined function to compare key names!
This function compares the key names of two (or more) arrays and returns an intersection array that includes everything in the compared array (array1) and any other parameter arrays. (array2 or array3, etc.).
array3, etc.
Syntax
array_intersect_ukey(array1,array2,array3...,myfunction)
Parameters | Description |
array1 | Required. The first array to compare with other arrays. |
array2 | Required. The array to compare to the first array. |
array3,... | Optional. Additional array to compare with the first array. |
myfunction | Required. A string that defines a callable comparison function. If the first argument is f2c570bc5a616fb55b90df8c3566974f and the second argument is, the corresponding comparison function must return an integer of f2c570bc5a616fb55b90df8c3566974f 0. |
Technical details
Return value: | Returns an intersection array, which contains All keys in the compared array (array1) that are also in any other parameter arrays (array2 or array3, etc.). |
PHP version: | 5.1.0+ |
More examples
Examples 1
Compare the key names of the three arrays (use a user-defined function to compare the key names) and return the intersection:
<?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"); $result=array_intersect_ukey($a1,$a2,$a3,"myfunction"); print_r($result); ?>
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