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<?php declare(strict_types=1); function myadd(int $a, int $b): int { return $a + $b . "hello"; } echo myadd(6, 7);
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
Fatal error: Uncaught TypeError: myadd(): Return value must be of type int, string returned in /in/4v8RS:5 Stack trace: #0 /in/4v8RS(8): myadd(6, 7) #1 {main} thrown in /in/4v8RS on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of myadd() must be of the type int, string returned in /in/4v8RS:5 Stack trace: #0 /in/4v8RS(8): myadd(6, 7) #1 {main} thrown in /in/4v8RS on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: Uncaught TypeError: Return value of myadd() must be of the type integer, string returned in /in/4v8RS:5 Stack trace: #0 /in/4v8RS(8): myadd(6, 7) #1 {main} thrown in /in/4v8RS on line 5
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: Unsupported declare 'strict_types' in /in/4v8RS on line 2 Parse error: syntax error, unexpected ':', expecting '{' in /in/4v8RS on line 4
Process exited with code 255.

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