Description:
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From manual page: http://www.php.net/function.array-intersect-assoc%23Description
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Could you maybe add that entries from both arrays are matched based on their key and value pairs?
If in both arrays a certain key exists but the values are different, then it would not be considered a match.
It took me a while to figure this out.

Thanks in advance!



Test script:
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Another example like this would be helpful to understand the working of the method.
<?PHP
$array1 = array(  1 => 20,  6 => 20);
$array2 = array(  1 => 6,  6 => 20);
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>