<?php $data = [ 'title' => 'some title', 'date' => 1350498600, 'story' => 'Some story' ]; $template = '#title#, <br>#date(d)#<br> #date(m)#<br>#date(Y)#<br> #story#'; echo preg_replace_callback( '/#(\w+)(?(?<=date)\((.*?)\)|)#/', fn($m) => $m[1] === 'date' ? (date($m[2], $data[$m[1]] ?? null)) : ($data[$m[1]] ?? $m[1]), $template, flags: PREG_UNMATCHED_AS_NULL );
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