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@ 2017-03-29T11:53:29Z

<?php

    $string = "j3987snmj3j";
    $numbers= filter_var($string , FILTER_SANITIZE_NUMBER_INT);
    $length = strlen($numbers);
    echo "There are ".$length." numbers in that string";

Output
Performance
VLD
References
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filter_var: documentation ( source)

preferences:dark modelive previewkey bindings

36.5 ms | 404 KiB | 5 Q