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<?php if (!function_exists('get_error_handler')) { function noop_error_handler() { } function get_error_handler(): ?callable { $handler = set_error_handler('noop_error_handler'); restore_error_handler(); return $handler; } } $handler = function (int $errno, string $errstr, ?string $errfile, ?int $errline) { echo "Error: " . $errstr . "\n"; }; set_error_handler($handler); $ab = get_error_handler(); print_R($a); set_error_handler(function() { $a(); print 123;} ); echo $a;
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Error: Undefined variable $a Warning: Undefined variable $a in /in/nLGf4 on line 26 Fatal error: Uncaught Error: Value of type null is not callable in /in/nLGf4:26 Stack trace: #0 /in/nLGf4(30): {closure:/in/nLGf4:24}(2, 'Undefined varia...', '/in/nLGf4', 30) #1 {main} thrown in /in/nLGf4 on line 26
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
Error: Undefined variable $a Warning: Undefined variable $a in /in/nLGf4 on line 26 Fatal error: Uncaught Error: Value of type null is not callable in /in/nLGf4:26 Stack trace: #0 /in/nLGf4(30): {closure}(2, 'Undefined varia...', '/in/nLGf4', 30) #1 {main} thrown in /in/nLGf4 on line 26
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Error: Undefined variable: a Notice: Undefined variable: a in /in/nLGf4 on line 26 Fatal error: Uncaught Error: Function name must be a string in /in/nLGf4:26 Stack trace: #0 /in/nLGf4(30): {closure}(8, 'Undefined varia...', '/in/nLGf4', 30, Array) #1 {main} thrown in /in/nLGf4 on line 26
Process exited with code 255.
Output for 7.0.0 - 7.0.33
Parse error: syntax error, unexpected '?' in /in/nLGf4 on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 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 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/nLGf4 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 ':', expecting '{' in /in/nLGf4 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/nLGf4 on line 6
Process exited with code 255.
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