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@ 2013-05-28T09:34:31Z

<?php
$fileContent = '12em\n1.3 em';
preg_replace_callback('/([0-9,-\.]+)\s*(em)/', 'replace_em', $fileContent);

function replace_em($value) {
    return $value * 123;
}

Output
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VLD
References
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preg_replace_callback: documentation ( source)

preferences:dark modelive preview

35.74 ms | 402 KiB | 5 Q