PHP array_diff_ukey() function definition and usage-PHP Tutorial-php.cn

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PHP array_diff_ukey() function definition and usage

巴扎黑

May 24, 2017 pm 02:25 PM

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);

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>

Run result:

Array ( [c] => blue )

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>

Running result:

Array ( [c] => blue )

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