Custom Error In Php
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( string message [, int message_type [, string destination [, string extra_headers]]]) While assert() is a good function to make extensive use of, it only catches errors you were expecting. While that might sound obvious, it is quite crucial - if an error you have not planned for occurs, how are you to find out about it? Never fear - there are two functions available to make your life much easier: set_error_handler() and error_log(). Set_error_handler() takes the name of a user callback function as its only parameter, and it servers to notify PHP that if there are any errors, it should call that user function to handle them. The user function needs to accept a minimum of two parameters, but in practice you will likely want to accept four. These are, in order, the error number that occurred, the string version of the error, the file the error occurred in, and the line of the error. Here is an example: On line four we define the general error handler to be the on_error() function, then call print $foo which, as $foo does not exist, is an error, and will result in on_error() being called. The definition of on_error() is as described - it takes four parameters, then prints them out to the screen in a nicely formatted manner. There is a second parameter to set_error_handler() that lets you choose what errors should trigger the error handler, and it works like the error_reporting directive in php.ini. However, it's important to remember that you can only have one active error handler at any time, not one for each level of error. This code should explain it: Note that the error is that $foo isn't set; that should output a notice. On the surface that looks as though we're assigning func_notice() to handle E_NOTICE-level messages and also assigning func_error() to handle E_ERROR-level messages. However, because we can only have one error handler at any one time, the second call to set_error_handler() replaces the first with one that only listens to E_ERROR messages. The restore_error_handler() takes no parameters and returns no meaningful value, but it restores the previous error handler. There is onl