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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 git.master, git.master_jit, rfc.property-hooks
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"]"

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