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<?php $arr = []; $arr[] = &$arr; var_dump($arr, count($arr, COUNT_RECURSIVE));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: count(): Recursion detected in /in/7Ihrc on line 5 array(1) { [0]=> *RECURSION* } int(1)
Output for 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: count(): recursion detected in /in/7Ihrc on line 5 array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } int(1)
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33
Warning: count(): recursion detected in /in/7Ihrc on line 5 array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } int(3)
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/7Ihrc 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/7Ihrc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/7Ihrc on line 3
Process exited with code 255.

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