3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(): ?iterable { return array(); } function bar(): ?iterable { return null; } foo(); bar();
Output for 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, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
Output for 7.0.0 - 7.0.33
Parse error: syntax error, unexpected '?' in /in/rK9vc on line 3
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, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/rK9vc 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 ':', expecting '{' in /in/rK9vc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/rK9vc on line 3
Process exited with code 255.
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94.91 ms | 411 KiB | 5 Q