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<?php $data = 'name=Nakka+Chandra&code=%22%27%5C%00&age=18&data%5Bsocial%5D%5Bmarks%5D=80&data%5Bsocial%5D%5Bgrade%5D=A%2B&data%5Benglish%5D%5Bmarks%5D=100&data%5Benglish%5D%5Bgrade%5D=B%2B'; parse_str($data, $data); var_export($data);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array ( 'name' => 'Nakka Chandra', 'code' => '"\'\\' . "\0" . '', 'age' => '18', 'data' => array ( 'social' => array ( 'marks' => '80', 'grade' => 'A+', ), 'english' => array ( 'marks' => '100', 'grade' => 'B+', ), ), )
Output for 4.3.0 - 4.3.8, 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.1 - 5.2.17, 5.3.0 - 5.3.29
array ( 'name' => 'Nakka Chandra', 'code' => '\\"\\\'\\\\\\0', 'age' => '18', 'data' => array ( 'social' => array ( 'marks' => '80', 'grade' => 'A+', ), 'english' => array ( 'marks' => '100', 'grade' => 'B+', ), ), )
Output for 5.2.0
array ( 'name' => 'Nakka Chandra', 'code' => '\\\\\\"\\\\\\\'\\\\\\\\\\\\0', 'age' => '18', 'data' => array ( 'social' => array ( 'marks' => '80', 'grade' => 'A+', ), 'english' => array ( 'marks' => '100', 'grade' => 'B+', ), ), )
Output for 4.3.9
array ( 'name' => 'Nakka Chandra', 'code' => '\\"\\\'\\\\\\', 'age' => '18', 'data' => array ( 'social' => array ( 'marks' => '80', 'grade' => 'A+', ), 'english' => array ( 'marks' => '100', 'grade' => 'B+', ), ), )

preferences:
246.85 ms | 402 KiB | 459 Q