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PHP array_uintersect_uassoc() Function

Quick summary: The PHP array_uintersect_uassoc() function computes the intersection of arrays using user-defined callbacks for both value and key comparison.

PHP array_uintersect_uassoc() Syntax 

array_uintersect_uassoc(array $array, array ...$arrays, callable $value_compare_func, callable $key_compare_func): array
PHP

PHP array_uintersect_uassoc() Basic examples 

function valCmp($a,$b){ return $a <=> $b; }
function keyCmp($a,$b){ return strcmp($a,$b); }
$a=['a'=>1,'b'=>2];
$b=['a'=>1,'b'=>3];
print_r(array_uintersect_uassoc($a,$b,'valCmp','keyCmp'));
PHP
Output:
Array ( [a] => 1 )

Uses custom comparison for both keys and values.

PHP array_uintersect_uassoc() Real-world usage

PHP array_uintersect_uassoc() Edge cases 

array_uintersect_uassoc($a,$b,null,null);
PHP
Output:
Warning

Both callbacks must be valid callables.

PHP array_uintersect_uassoc() Common mistakes

Incorrect callback order

Value comparison callback must come before key comparison callback.

Incorrect
array_uintersect_uassoc($a,$b,'keyCmp','valCmp');
Correct
array_uintersect_uassoc($a,$b,'valCmp','keyCmp');

Provide value comparison first, then key comparison.

PHP array_uintersect_uassoc() Frequently Asked Questions

What does array_uintersect_uassoc() do?

Intersection with user-defined comparison for both values and keys.

Use case?

Fully custom intersection logic.

Callbacks required?

Yes.

Common mistake?

Wrong callback logic.

Return type?

Array.

Performance?

Slower due to callbacks.

Safe?

Yes.

Alternative?

array_uintersect_assoc().

Flexible?

Highly.

Handles keys and values?

Yes.

Best practice?

Optimize callbacks.

Used in complex filtering?

Yes.

PHP array_uintersect_uassoc() Related PHP Functions