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<?php $arr = [ "May Hello May", "Jun Hello12", "Jul 3" ]; var_export( preg_replace_callback('/^[A-Z][a-z]{2}\b/', fn($m) => date('m', strtotime($m[0])), $arr) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '05 Hello May', 1 => '06 Hello12', 2 => '07 3', )

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