<?php $strings = array( 'this is a string', 'this is $ a string', 'this is 12 string', 'this is $12.99 string', ); foreach ($strings as $string) { var_dump(strtolower(preg_replace('#[\s+]#', ' ', preg_replace('#[^a-z0-9\-\s]#', '', $string)))); }
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