<?php $arr = [ "May Hello May", "Jun Hello12", "Jul 3", "Jun Hello13", "Jun Hello14" ]; var_export( preg_replace_callback( '/^[A-Z][a-z]{2}\b/', function($m) { static $trans = []; if (!isset($trans[$m[0]])) { echo "Push date translation element for {$m[0]}\n"; $trans[$m[0]] = date('m', strtotime($m[0])); } return $trans[$m[0]]; }, $arr ) );
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