<?php $var = "one, two , three = ?, four = 'val', five , six = 1, seven, eight = 'val' , nine"; echo implode(', ', array_map(function($x){ return preg_match('/\w+\h*=\h*\S/', $x) === 0 ? $x.' = ?' : $x; }, array_map("trim", explode(',', $var))));
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