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<?php // error handler function function myErrorHandler($errno, $errstr, $errfile, $errline) { if (!(error_reporting() & $errno)) { // This error code is not included in error_reporting, so let it fall // through to the standard PHP error handler return false; } switch ($errno) { case E_USER_ERROR: echo "My ERROR [$errno] $errstr \n"; echo " Fatal error on line $errline in file $errfile"; echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ") \n"; echo "Aborting... \n"; exit(1); break; case E_USER_WARNING: echo "My WARNING [$errno] $errstr \n"; break; case E_USER_NOTICE: echo "My NOTICE [$errno] $errstr \n"; break; default: echo "Unknown error type: [$errno] $errstr \n"; break; } /* Don't execute PHP internal error handler */ return true; } // function to test the error handling function scale_by_log($vect, $scale) { if (!is_numeric($scale) || $scale <= 0) { trigger_error("log(x) for x <= 0 is undefined, you used: scale = $scale", E_USER_ERROR); } if (!is_array($vect)) { trigger_error("Incorrect input vector, array of values expected", E_USER_WARNING); return null; } $temp = array(); foreach($vect as $pos => $value) { if (!is_numeric($value)) { trigger_error("Value at position $pos is not a number, using 0 (zero)", E_USER_NOTICE); $value = 0; } $temp[$pos] = log($scale) * $value; } return $temp; } // set to the user defined error handler $old_error_handler = set_error_handler("myErrorHandler"); // trigger some errors, first define a mixed array with a non-numeric item echo "vector a\n"; $a = array(2, 3, "foo", 5.5, 43.3, 21.11); print_r($a); // now generate second array echo "----\nvector b - a notice (b = log(PI) * a)\n"; /* Value at position $pos is not a number, using 0 (zero) */ $b = scale_by_log($a, M_PI); print_r($b); // this is trouble, we pass a string instead of an array echo "----\nvector c - a warning\n"; /* Incorrect input vector, array of values expected */ $c = scale_by_log("not array", 2.3); var_dump($c); // NULL // this is a critical error, log of zero or negative number is undefined echo "----\nvector d - fatal error\n"; /* log(x) for x <= 0 is undefined, you used: scale = $scale" */ $d = scale_by_log($a, -2.5); var_dump($d); // Never reached

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