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run code in 150+ php & hhvm versions
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<?php function parseQueryString($str) { $result = []; foreach (explode('&', $str) as $element) { $parts = explode('=', $element, 2); $key = urldecode(array_shift($parts)); $value = $parts ? urldecode(array_shift($parts)) : ''; if (false !== $pos = strpos($key, '[')) { $base = substr($key, 0, $pos++); $result[$base] = []; $target = &$result[$base]; do { $end = strpos($key, ']', $pos); $index = substr($key, $pos, $end - $pos); $target[$index] = []; $target = &$target[$index]; $pos = $end; } while($pos < strlen($key)); var_dump($result); } } } $str = 'foo=bar&baz[foo]=qux&baz[foo][goat]=chick'; parseQueryString($str);
Output for 7.0.14 - 7.1.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/93eAc on line 20
Process exited with code 255.
Output for 7.0.0 - 7.0.6
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4096 bytes) in /in/93eAc on line 19
Process exited with code 255.
Output for hhvm-3.12.0

Process exited with code 139.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.6.7 - 5.6.28
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 32 bytes) in /in/93eAc on line 19
Process exited with code 255.
Output for 5.5.24 - 5.5.35
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 72 bytes) in /in/93eAc on line 20
Process exited with code 255.
Output for 5.4.26 - 5.4.45
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 73 bytes) in /in/93eAc on line 20
Process exited with code 255.
Output for 5.4.0 - 5.4.25
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 73 bytes) in /in/93eAc on line 20
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/93eAc on line 5
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 '[' in /in/93eAc on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/93eAc on line 5
Process exited with code 255.