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<?php $str = 'foo'; $replacement = 'bar'; $str1 = preg_replace_callback('/^foo$/', function($match) { global $replacement; return $replacement; }, $str); $str2 = preg_replace_callback('/^foo$/', function($match, &$replacement) { return $replacement; }, $str); $str3 = preg_replace_callback('/^foo$/', function($match) use ($replacement) { return $replacement; }, $str); var_dump($str1); var_dump($str2); var_dump($str3);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/F3ULn:12 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/F3ULn(12): preg_replace_callback('/^foo$/', Object(Closure), 'foo') #2 {main} thrown in /in/F3ULn on line 12
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/F3ULn:12 Stack trace: #0 [internal function]: {closure}(Array) #1 /in/F3ULn(14): preg_replace_callback('/^foo$/', Object(Closure), 'foo') #2 {main} thrown in /in/F3ULn on line 12
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Warning: Missing argument 2 for {closure}() in /in/F3ULn on line 12 Notice: Undefined variable: replacement in /in/F3ULn on line 13 string(3) "bar" string(0) "" string(3) "bar"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/F3ULn on line 6
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 T_FUNCTION in /in/F3ULn on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/F3ULn on line 6
Process exited with code 255.
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