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<?php $a = [1, 2, 3]; unset($a[2]); print_r($a); var_dump(array_is_list($a)); echo "\n"; $a[] = 4; print_r($a); var_dump(array_is_list($a));
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Array ( [0] => 1 [1] => 2 ) bool(true) Array ( [0] => 1 [1] => 2 [3] => 4 ) bool(false)
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Array ( [0] => 1 [1] => 2 ) Fatal error: Uncaught Error: Call to undefined function array_is_list() in /in/fV80Z:7 Stack trace: #0 {main} thrown in /in/fV80Z on line 7
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Array ( [0] => 1 [1] => 2 ) Fatal error: Call to undefined function array_is_list() in /in/fV80Z on line 7
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 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/fV80Z on line 3
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 '[' in /in/fV80Z on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/fV80Z on line 3
Process exited with code 255.

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