PHP's set_error_handler function explained
PHP's set_error_handler() function is used to set a user-defined error handler function and trigger an error.
If this function is used then standard PHP error handler is completely bypassed.
If any error occurs before the script is executed the custom error handler cannot be used since it is not registered at that time.
Let's see an example.
We have created a custom error handling function myErrorHandler(). Then we are calling it using set_error_handler() function by passing it as a parameter.
function myErrorHandler($errno, $errstr, $errfile, $errline)
{
echo "Custom error: [$errno] $errstr";
echo " Error on line $errline in $errfile";
}
set_error_handler("myErrorHandler");