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<?php $fileContent = '12em\n1.3 em'; echo preg_replace_callback('/([0-9,-\.]+)\s*(em)/', 'replace_em', $fileContent); function replace_em($value) { return $value[0] * 123 . 'em'; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: A non-numeric value encountered in /in/LAHmC on line 6 Warning: A non-numeric value encountered in /in/LAHmC on line 6 1476em\n159.9em

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