3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = array('key' => null, 'foo' => 0); var_dump(isset($data['key'])); // unsafe var_dump(isset($data['foo'])); // unsafe var_dump(array_key_exists('key', $data)); // better, but still unsafe var_dump(array_key_exists('key', $data) && $data['key']); // safe
Output for 5.4.0 - 5.4.31
Parse error: syntax error, unexpected ''foo'' (T_CONSTANT_ENCAPSED_STRING), expecting ')' in /in/and3V on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ')' in /in/and3V on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ')' in /in/and3V on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/and3V on line 2
Process exited with code 255.
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563.81 ms | 1399 KiB | 122 Q