3v4l.org

run code in 300+ PHP versions simultaneously
<?php $packed = pack('a6', 'i'); // PHP 5.4 $data = "hoge" // PHP 5.5 $data = "hoge\0\0" var_dump($data = unpack('a1b/a1c', $packed)); // PHP 5.5 $data = "hoge" var_dump($data = unpack('Z6', $packed));
Output for 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(2) { ["b"]=> string(1) "i" ["c"]=> string(1) "" } array(1) { [1]=> string(1) "i" }
Output for 4.4.8 - 4.4.9, 5.2.4 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45
array(2) { ["b"]=> string(1) "i" ["c"]=> string(0) "" } Warning: unpack(): Invalid format type Z in /in/P9iHt on line 10 bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.7, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.3
array(2) { ["b"]=> string(1) "i" ["c"]=> string(0) "" } array(0) { }

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324.02 ms | 402 KiB | 459 Q