What is the error in PHP

What is the error in PHP?

PHP errors refer to PHP error handling.

In PHP, the default error handling is simple. An error message is sent to the browser with the file name, line number, and a message describing the error.

PHP Error Handling

Error handling is an important part when creating scripts and web applications. If your code lacks error detection coding, the program will look unprofessional and open the door to security risks.

This tutorial introduces some of the most important error detection methods in PHP.

We will explain different error handling methods to you:

Simple "die()" statement

Custom errors and error triggers

Error reporting

Basic error handling: using the die() function

The first example shows a simple script to open a text file:

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

If the file does not exist, You will get errors like this:

Warning: fopen(welcome.txt) [function.fopen]: failed to open stream:
No such file or directory in /www/runoob/test/test.php on line 2

To avoid users getting error messages like the above, we check if the file exists before accessing it:

<?php
if(!file_exists("welcome.txt"))
{
    die("文件不存在");
}
else
{
    $file=fopen("welcome.txt","r");
}
?>

Now, if the file does not exist, You will get an error message like this:

File does not exist

The above code is more efficient than the previous code because it uses a simple The error handling mechanism terminates the script after an error.

However, simply terminating the script is not always the appropriate approach. Let's examine alternative PHP functions for handling errors.

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