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<?php $x = [0, 1]; unset($x[1]); $y = $x; $x[] = 'new'; $y[] = 'new'; last($x); last($y); var_dump(key($x)); var_dump(key($y));
Output for 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Call to undefined function last() in /in/8PLRc:9 Stack trace: #0 {main} thrown in /in/8PLRc on line 9
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Call to undefined function last() in /in/8PLRc on line 9
Process exited with code 255.

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