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<?php $foo = '1'; var_dump($foo); var_dump(addslashes($foo)); var_dump("'" . addslashes($foo) . "'");
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "1" string(1) "1" string(3) "'1'"