<?php $tests = [ ", One ,, ,,", ", Two , Three", "Four, Five ", " Six,Seven, ", " ,Eight ,Nine , , , , Ten ,", ",,Eleventy Twelve , , Thrirteen " ]; foreach ($tests as $test) { var_export( preg_replace('/[, ]*,[, ]*/', ', ', trim($test, ', ')) ); echo "\n"; }
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