filter an array and get invalid items in php

Question

I have an array of phone numbers, and I need a fast way to split this array into valid and invalid phone numbers (according to my definition of valid and invalid), something like:

$phone_numbers = array(
    '04165555555',
    '02125555555'
);

$valid_phone_number_regex = '/^0?(416|426|412|424|414)(\d{7})$/i';

I could use array_filter to get all of the valid numbers, but I also need the invalid ones (for reporting issues) in a fast way, the array may hold thousands of numbers!

If you're performing operations on thousands of rows, you may want to consider doing it in a database as it's optimised for that sort of thing. Failing that, I think your array_filter approach is about the best bet with array_diff for invalids — Basic
– Basic, Commented Jun 13, 2012 at 22:31
what's wrong with array_filter() to get $valids followed by an array_diff() against the original array and $valids to get the invalid numbers — Mark Baker
– Mark Baker, Commented Jun 13, 2012 at 22:31
@MarkBaker: there's nothing wrong with that, the only wrong is that didn't occurre to me :-) — Cesar
– Cesar, Commented Jun 13, 2012 at 23:41

nickb · Accepted Answer · 2012-06-13 22:35:59Z

2

After you get the valid ones from array_filter(), use array_diff() to return all of the elements from the $input_array that are not in the $working array.

$input_array = array( '04165555555', '02125555555');
$working = array_filter( $input_array, function( $el){ return preg_match( '/^0?(416|426|412|424|414)(\d{7})$/i', $el ); });
$not_working = array_diff( $input_array, $working);

Output:

Valid:
array(1) { [0]=> string(11) "04165555555" }
Invalid:
array(1) { [1]=> string(11) "02125555555" }

Demo

edited Jun 13, 2012 at 22:35

answered Jun 13, 2012 at 22:29

nickb

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