The PHP array_udiff_uassoc() function compares the keys/values of two or more arrays, and returns the entries from array1 not in the other array(s).
This function uses two user-defined functions for comparison. The key is used in the first function and the value is used in the second.
Both the keys and values are compared. Both must be a match.
$b)?1:-1;
}
function my_function_value($a, $b) {
if ($a===$b) {
return 0;
}
return ($a>$b)?1:-1;
}
$a1 = array('Car 1' => 'Lamborghini', 'Car 2' => 'Alfa Romeo', 'Car 5' => 'Maserati');
$a2 = array('Car 1' => 'Lamborghini', 'Car 2' => 'Ferrari', 'Car 3' => 'Maserati');
$result = array_udiff_uassoc($a1, $a2, 'my_function_value', 'my_function_key');
print_r($result);
?>
Output
Array ( [Car 2] => Alfa Romeo [Car 5] => Maserati )
Syntax
array_udiff_uassoc(array1, array2, array3, ..., myfunc_key, myfunc_value)
Parameters
Parameter | Description |
---|---|
array1 | The array to compare from (required) |
array2 | The array to compare against (required) |
array3, ... | Additional arrays to compare against |
myfunc_key | The name of the user-defined function that compares the array keys; a string that defines a callable comparison function; the comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument (required) |
myfunc_value | The name of the user-defined function that compares the array values; a string that defines a callable comparison function; the comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument (required) |
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PHP NOTES:
- When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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