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run code in 300+ PHP versions simultaneously
<?php if (defined('HHVM_VERSION')) { exit('*HHVM skipped*'); } function myErrorHandler($errno, $errstr, $errfile, $errline) { if ($errno == E_NOTICE && in_array($errstr, array( 'Undefined variable: undefined', 'Undefined variable: undefined', ), true)) { echo "\n"; echo "Caught a Notice: Undefined variable: undefined in $errfile on line $errline\n"; return true; } if ($errno == E_WARNING && in_array($errstr, array( 'reset() expects parameter 1 to be array, null given', 'reset(): Passed variable is not an array or object', 'reset() [http://www.php.net/function.reset]: Passed variable is not an array or object', ), true)) { echo "\n"; echo "(caught the warning about null not being an array in $errfile on line $errline)\n"; return true; } return false; } set_error_handler('myErrorHandler'); // The following line will not emit a notice, because reset() takes its parameter by reference reset($undefined);

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