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<?php $replace = array( '/</', '/>/', '/*/', /*'/!/', '/;/', '/#/', '/(/', '/)/', '/@/', '/|/', '/[/', '/]/', '/}/', '/{/', '/$/'*/ ); $e = array_fill(0, count($replace), ''); var_dump($e); print preg_replace( $replace, $e, 'ls; ${}[]@()#!*<asdlad>' );

preferences:
36.88 ms | 402 KiB | 5 Q