die() in php

Basic Error Handling: Using the die() function
The first example shows a simple script that opens a text file:

<?php $file=fopen("welcome.txt","r"); ?>

If the file does not exist you might get an error like this:

Warning:

fopen(welcome.txt) [function.fopen]: failed to open stream:
No such file or directory in C:\webfolder\test.php on line 2
To avoid that the user gets an error message like the one above, we test if the file exist before we try to access it:

<?php if(!file_exists("welcome.txt")) { die("File not found"); } else { $file=fopen("welcome.txt","r"); } ?>

Now if the file does not exist you get an error like this:
File not found

The code above is more efficient than the earlier code, because it uses a simple error handling

mechanism to stop the script after the error.

However, simply stopping the script is not always the right way to go. Let's take a look at

alternative PHP functions for handling errors. 

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error handling in php

PHP Error Handling
The default error handling in PHP is very simple. An error message with filename, line number and a message describing the error is sent to the browser.
PHP Error Handling
When creating scripts and web applications, error handling is an important part. If your code lacks error checking code, your program may look very unprofessional and you may be open to security risks.
We will show different error handling methods:

• Simple "die()" statements
• Custom errors and error triggers
• Error reporting

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