<?php $array = [ 'red', ' ', 'blue', ' ', '', 'green ', ' ', 'white', ' ', 'black', ' ', ]; var_export(array_filter($array, fn($v) => !ctype_space($v))); echo "\n---\n"; var_export(preg_grep('/^\s+$/', $array, PREG_GREP_INVERT));
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