PHP array_diff_ukey() function definition and usage

巴扎黑
Release: 2023-03-07 21:28:02
Original
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Definition and usage

array_diff_ukey() function is used to compare the key names of two (or more) arrays and return the difference.

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 a difference array that includes everything in the compared array (array1) but not in any other parameter array (array2 or array3, etc.).

Syntax

array_diff_ukey(array1,array2,array3...,myfunction);
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Parameter description

array1 Required. The first array to compare with other arrays. ​

array2 Required. The array to compare to the first array.

array3,... Optional. The other array

myfunction that is compared with the first array must be present. A string that defines a callable comparison function. If the first argument is <, =, > and the second argument is, the corresponding comparison function must return an integer of <, =, > 0.

Return value:

Returns a difference array that includes all elements in the compared array (array1) that are not in any other parameter array (array2) or array3, etc.).

Example display 1:

<!DOCTYPE html>
<html>
<body>
<?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);
?>
</body>
</html>
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Run result:

Array ( [c] => blue )
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Example display 2:

<!DOCTYPE html>
<html>
<body>
<?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);
?>
</body>
</html>
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Running result:

Array ( [c] => blue )
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