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<?php echo preg_replace_callback( '\d+', '123abc456def789', 'incr' ); function incr($args){ var_dump($args); }
Output for 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, function "123abc456def789" not found or invalid function name in /in/IZn9m:3 Stack trace: #0 /in/IZn9m(3): preg_replace_callback('\\d+', '123abc456def789', 'incr') #1 {main} thrown in /in/IZn9m on line 3
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, function "123abc456def789" not found or invalid function name in /in/IZn9m:6 Stack trace: #0 /in/IZn9m(6): preg_replace_callback('\\d+', '123abc456def789', 'incr') #1 {main} thrown in /in/IZn9m on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: preg_replace_callback(): Requires argument 2, '123abc456def789', to be a valid callback in /in/IZn9m on line 6 incr
Output for 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 - 5.6.28
Warning: preg_replace_callback(): Requires argument 2, '123abc456def789', to be a valid callback in /in/IZn9m on line 7 incr
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: preg_replace_callback(): requires argument 2, '123abc456def789', to be a valid callback in /in/IZn9m on line 7 incr
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Warning: preg_replace_callback() requires argument 2, '123abc456def789', to be a valid callback in /in/IZn9m on line 7 incr

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