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run code in 150+ php & hhvm versions
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<?php $replace = array( '/</', '/>/', '/*/', '/!/', '/;/', '/#/', '/(/', '/)/', '/@/', '/|/', '/[/', '/]/', '/}/', '/{/', '/$/' ); $e = array_fill(0, count($replace), ''); var_dump($e); print preg_replace( $replace, $e, 'ls; ${}[]@()#!*<asdlad>' );
Output for 5.2.5 - 5.6.28, 7.0.0 - 7.1.0
array(15) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(0) "" [6]=> string(0) "" [7]=> string(0) "" [8]=> string(0) "" [9]=> string(0) "" [10]=> string(0) "" [11]=> string(0) "" [12]=> string(0) "" [13]=> string(0) "" [14]=> string(0) "" } Warning: preg_replace(): Compilation failed: nothing to repeat at offset 0 in /in/nGJYc on line 21
Output for hhvm-3.12.0
array(15) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(0) "" [6]=> string(0) "" [7]=> string(0) "" [8]=> string(0) "" [9]=> string(0) "" [10]=> string(0) "" [11]=> string(0) "" [12]=> string(0) "" [13]=> string(0) "" [14]=> string(0) "" } Warning: Compilation failed: nothing to repeat at offset 0 in /in/nGJYc on line 21
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.2.4
array(15) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(0) "" [6]=> string(0) "" [7]=> string(0) "" [8]=> string(0) "" [9]=> string(0) "" [10]=> string(0) "" [11]=> string(0) "" [12]=> string(0) "" [13]=> string(0) "" [14]=> string(0) "" } Warning: preg_replace(): Compilation failed: nothing to repeat at offset 0 in /in/nGJYc on line 21 Warning: preg_replace(): Compilation failed: missing ) at offset 1 in /in/nGJYc on line 21 Warning: preg_replace(): Compilation failed: unmatched parentheses at offset 0 in /in/nGJYc on line 21 Warning: preg_replace(): Compilation failed: missing terminating ] for character class at offset 1 in /in/nGJYc on line 21 ls $[()*asdlad
Output for 4.3.0 - 4.3.10
array(15) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" [5]=> string(0) "" [6]=> string(0) "" [7]=> string(0) "" [8]=> string(0) "" [9]=> string(0) "" [10]=> string(0) "" [11]=> string(0) "" [12]=> string(0) "" [13]=> string(0) "" [14]=> string(0) "" } Warning: Compilation failed: nothing to repeat at offset 0 in /in/nGJYc on line 21 Warning: Compilation failed: missing ) at offset 1 in /in/nGJYc on line 21 Warning: Compilation failed: unmatched parentheses at offset 0 in /in/nGJYc on line 21 Warning: Compilation failed: missing terminating ] for character class at offset 1 in /in/nGJYc on line 21 ls $[()*asdlad