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run code in 150+ php & hhvm versions
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<?php $array = array("lol","lulz","42","\\blub"); array_walk($array, function(&$elm) use($array) { $elm = str_replace('\\', '\\\\', $elm); var_dump($array); }); $value = json_encode($array); var_dump($value);
Output for 5.3.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } string(30) "["lol","lulz","42","\\\\blub"]"
Output for 5.3.6
array(4) { [0]=> &string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> &string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> &string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> &string(6) "\\blub" } string(127) "{"36857672":"1\u0000\u0000","36857272":"1\u0000\u0000\u0000","36849256":"1\u0000","36849344":"1\u0000\u0000\u0000\u0000\u0000"}"
Output for 5.3.0 - 5.3.5
array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } array(4) { [0]=> string(3) "lol" [1]=> string(4) "lulz" [2]=> string(2) "42" [3]=> string(5) "\blub" } string(28) "["lol","lulz","42","\\blub"]"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/00Nfi on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/00Nfi on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/00Nfi on line 3
Process exited with code 255.