PHP array_uintersect_assoc() Function
Quick summary: The PHP array_uintersect_assoc() function computes the intersection of arrays with additional index check and uses a user-defined comparison function for values.
PHP array_uintersect_assoc() Syntax
array_uintersect_assoc(array $array, array ...$arrays, callable $value_compare_func): arrayPHP
PHP array_uintersect_assoc() Basic examples
function cmp($a,$b){ return $a <=> $b; }
$a=['a'=>1,'b'=>2];
$b=['a'=>1,'b'=>3];
print_r(array_uintersect_assoc($a,$b,'cmp'));PHP
Output:
Array ( [a] => 1 )Matches both key and value, using custom value comparison.
PHP array_uintersect_assoc() Real-world usage
PHP array_uintersect_assoc() Edge cases
PHP array_uintersect_assoc() Common mistakes
Confusing with array_uintersect()
array_uintersect_assoc() also checks keys.
Incorrect
array_uintersect($a,$b,'cmp');Correct
array_uintersect_assoc($a,$b,'cmp');Use correct function when keys must match.
PHP array_uintersect_assoc() Frequently Asked Questions
What does array_uintersect_assoc() do?
Intersection with user-defined value comparison and index check.
Use case?
Strict intersection.
Callback required?
Yes.
Handles keys?
Yes.
Common mistake?
Ignoring keys.
Return type?
Array.
Performance?
Moderate.
Safe?
Yes.
Alternative?
array_intersect_assoc().
Flexible?
Yes.
Best practice?
Use when keys matter.
Used in configs?
Yes.