PHP Error Handling: All You Need To Know

Error handling is the process of finding errors raised by your program and taking action. This article will help you explore the concept of PHP Error Handling In detail. Following pointers will be covered in this article,

• Error Handling
• Using die ( ) function
• Sample Program

Let us get started with PHP Error Handling article,

Error Handling

It is very easy in PHP to handle errors. When creating scripts and web applications, error handling is a very 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 see different error handling methods:

*Simple “die()” statements

*Custom errors and error triggers

*Error reporting

Let us see how PHP Error Handling works with die function,

Using die ( ) function

When writing your PHP program you should check all possible errors before going ahead and take the appropriate action required. Example without having /tmp/test.xt file

<?php
If(!file_exists (&ldquo;/tmp/test.text&rdquo;))
{
die(&ldquo;File does not founds&rdquo;);
}
else
{
$file = fopen(&ldquo;/tmt/test.txt&rdquo;,&rdquo;r&rdquo;);
Print"opening file successfully&rdquo;;
}
}
?>

Creating a Custom Error Handler

Creating a custom error handler is very simple. We can simply create a special function that can be called whenever an error occurs in PHP code.

This function is able to handle a minimum of two parameters that may be error level or error message but can accept upto five optional parameters, they are file, line-number, and the error context

Syntax

error_function()
Set Error Handler

The default error handler for PHP is the built-in error handler given in the software. We are going to make the function above the default error handler for the duration of the script.

It is possible to change the error handler which is applied for only some errors, in that way the script can handle different errors in different ways in the code. However, in this example, we are going to use our custom error handler for all the errors in it.

set_error_handler(“’’);

Let us take a look at a sample program,

Sample Program

Testing the error handler by trying to output a variable that does not exist:

<?php
//error handler function
function custom error($errno, $errstr)
{
echo "<b>Error:</b> [$errno] $errstr";
}
set_error_handler("customError");
echo($test);
?>

Output

Error: [8] Undefined variable: test

This brings us to the end of this article.

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