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@ 2014-06-24T16:40:00Z

<?php

$phone = '(512) 800-1728';
$phone = preg_replace('/\D+/', '', $phone);
echo $phone;

?>

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive preview

32.02 ms | 402 KiB | 5 Q