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<?php $fileContent = '12em\n1.3 em'; preg_replace('/([0-9,-\.]+)\s*(em)/e', floatval('\1') * 123 . 'em', $fileContent);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/U2CeE on line 3

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