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PHP array_diff_ukey() function definition and usage
- 巴扎黑Original
- 2017-05-24 14:25:351446browse
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 f2c570bc5a616fb55b90df8c3566974f and the second argument is, the corresponding comparison function must return an integer of f2c570bc5a616fb55b90df8c3566974f 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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