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run code in 150+ php & hhvm versions
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<?php set_time_limit(1); $arr = ['f' => 'apple', 'g' => 'banana']; $child = &$arr; $i = 1; foreach ($child AS $key => $fruit) { $child[$i] = $fruit; unset($child[$key]); $i++; } var_dump($child);
based on 4DYmO
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(5) "apple" [2]=> string(6) "banana" }
Output for 5.4.2, 5.4.8, 5.4.11 - 5.4.13, 5.4.15 - 5.4.18, 5.4.20 - 5.4.21, 5.4.24 - 5.4.25, 5.4.32, 5.5.27, 5.5.29, 5.5.32, 5.6.14 - 5.6.15, 5.6.17, 5.6.19 - 5.6.28
Fatal error: Maximum execution time of 1 second exceeded in /in/G4pMD on line 10
Process exited with code 255.
Output for 5.4.0, 5.4.4, 5.4.7, 5.4.22 - 5.4.23, 5.4.28, 5.4.44, 5.5.24 - 5.5.25, 5.5.31, 5.5.34 - 5.5.35, 5.6.8 - 5.6.9, 5.6.18
Fatal error: Maximum execution time of 1 second exceeded in /in/G4pMD on line 13
Process exited with code 255.
Output for 5.4.1, 5.4.19, 5.4.26 - 5.4.27, 5.4.45, 5.6.11 - 5.6.12, 5.6.16
Fatal error: Maximum execution time of 1 second exceeded in /in/G4pMD on line 14
Process exited with code 255.
Output for 5.4.3, 5.4.5 - 5.4.6, 5.4.9 - 5.4.10, 5.4.14, 5.4.29 - 5.4.31, 5.4.43, 5.5.26, 5.5.28, 5.5.30, 5.5.33, 5.6.7, 5.6.10, 5.6.13
Fatal error: Maximum execution time of 1 second exceeded in /in/G4pMD on line 12
Process exited with code 255.
Output for 5.4.34 - 5.4.42

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/G4pMD 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/G4pMD on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/G4pMD on line 5
Process exited with code 255.