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@ 2014-07-31T10:41:37Z

<?php
$px = '1000px';

var_dump((int)$px);

function get_cm_by_px($px, $dpi = 300, $precision = 2) {
    $comma = ','; // if US use '.'
    return number_format(2.54 * (int)$px / $dpi , $precision, $comma,'') ;
}

get_cm_by_px($px);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
number_format: documentation ( source)

preferences:dark modelive preview

62.55 ms | 402 KiB | 5 Q