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<?php /** @param callable(int): int $closure */ function takesClosure($closure): int { return $closure(123); } function takesIntByRef(int &$i): int { return $i**2; } takesClosure("takesIntByRef");
Output for 8.3.0 - 8.3.29, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.2
Fatal error: Uncaught Error: takesIntByRef(): Argument #1 ($i) could not be passed by reference in /in/T3J6J:6 Stack trace: #0 /in/T3J6J(14): takesClosure('takesIntByRef') #1 {main} thrown in /in/T3J6J on line 6
Process exited with code 255.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30
Fatal error: Uncaught Error: takesIntByRef(): Argument #1 ($i) cannot be passed by reference in /in/T3J6J:6 Stack trace: #0 /in/T3J6J(14): takesClosure('takesIntByRef') #1 {main} thrown in /in/T3J6J on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Cannot pass parameter 1 by reference in /in/T3J6J:6 Stack trace: #0 /in/T3J6J(14): takesClosure('takesIntByRef') #1 {main} thrown in /in/T3J6J on line 6
Process exited with code 255.

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