E_USER_ERROR is a fatal user-generated runtime error. Errors that can no longer be fixed. The story is stopped.
E_USER_WARNING – User generated non-fatal runtime warning. The script often does not stop executing.
E_USER_NOTICE – standard. User generated progress notification.

A PHP php javascript error occurs when something is wrong with the PHP code. The error can be as simple as missing a semicolon, or as complex as calling the wrong variable. To solve a PHP problem safely and effectively with a good script, you need to understand what the problem is.

Error handling in PHP is undemanding. Error message with file name defined
A number and a message describing someone’s mistake are often sent to the browser.

Handling PHP Errors

Error handling is useful when scripting and extending applications.
Part. If you’re missing software verification code, your program may look very good.
unprofessional and you may be at risk of security. Training e manual

These are some of the most commonly used error checking methods in PHP.

Simple die() statements

User-defined errors and their associated error triggers

Reporting

Basic

error Handling: Using The Die() Function

The basic example shows a simple script that specifically opens a text file:

If the data does not exist, you may receive the following error message:

To prevent the user from getting an error message like the one above, let’s take a small example and see if
the file exists before you try to access it:

Now, if the entire file doesn’t exist, you’ll see an error like this:

The above code is more efficient than the previous one because it
uses a generic error handling mechanism to stop a new script after an error occurs.

However, simply fighting scripts is not always the solution. we accept
Check out alternative PHP success stories for error handling.

Create A UserRural Handler

Creating your own error handler can be quite simple. We’re just building specials.
A function that can be specified when an error occurs in PHP.

This function must be able to use at least two strategies (error
level and error message), but probably accepts up to five problems (optional: file, line number, and error context):

Syntax

Settings	Description
Error level	Required. Specifies the error reporting quality for a custom error. Must be a numeric value. See table below for possible error file levels
Error message	Required. Indicates an error message relative to a custom error
error_file	Optional. Indicates my filename where the error occurred
error_string	Optional. Indicates the series of numbers in which the error occurred
Error context	Optional. Specifies an array of each variable andits values ​​to use when an error occurs

Error Message Levels

These error reporting options are of different types that are most commonly associated with errors where a custom error handler is most useful:

The above code is a simple error handler. If it also goes out, then everything
gets the wrong quantity and an error message. It then displays the error level
message and exit the script.

Now that we have a bug created that supports the feature, we must decide at any time if it’s you
must be activated.

Install Error Handler

The default error for PHP handlers is, of course, the built-in error handler. We
will make the described function the default error handler if the duration
script.

It’s easy to change the error learning tool to only apply to certain errors,
This allows the script to handle different errors differently. However, inside
In this example, we are promoting the useUsing our dedicated error learning tool for all errors:

Because we want our custom function to handle all errors, set_error_handler()
Only a parameter is required, the second parameter can be even larger to indicate the error level.

Example

Currently testing the error handler, trying to accommodate non-existent output:

The end result of the above code should sometimes look like this:

Give An Error

In this script, where users can enter important information, it’s useful to cause dilemmas when
illegal entry occurs. In PHP this is done with some functions trigger_error().

Example

In this example, a specific error occurs when the variable “test” is normally greater than “1”:

The output of the above code should look like this:

A similar error can occur anywhere in the script when combined with adding
As a second parameter, a person can specify what level of error is usually raised.

E_USER_ERROR – unresolvedThe th runtime error generated by the user. Mistakes that can no longer be corrected. Execution of main script stopped

E_USER_WARNING because the user generated a non-fatal warning at run time. Script execution is not prevented

E_USER_NOTICE is the default. Confirmation notification created by the user. The script did not find anything that could be an error, although this can happen when another script is running normally

Example

In this example, something E_USER_WARNING occurs when the “test” setting is larger.
as “1”. When every E_USER_WARNING occurs, we use a few of our custom error handlers and exit the specific script:

The output of the code should look like this:

Now that we have learned to create and identify our own flaws,
Consider error logging.

Error Log

By default, PHP sends an error log, usually to the server’s logging system or to a file
depending on how the error_log config should be set to filele php.ini. Across
The error_log() function allows you to send error logs to a selected file or remote destination.

Sending bug reports by email can be a good way to get notified about specific bugs.

Submit A Bug Report By Email

In the example below, we will send an email due to an error message and stop doing so.
Scenario when certain slippage occurs:

The output of the above code should always look like this:

And the ship resulting from the code above looks like this:

This should not be preferred for all bugs. Regular errors should be logged
a server that uses the default PHP logging system.

Warning: fopen(mytestfile.txt) [function.fopen]: unable to open stream:
None of these file types or directories in C:\webfolder\test.php on line 2

Example

if(file_exists(“mytestfile.txt”))
$file equals fopen(“mytestfile.txt”,
“r”);

Also die(“Error: File definitely does not exist.”);

?>

function by PHP script

value	Constant	Description
1	E_ERROR	Fatal execution error. Execution of this script has been stopped
2	WARNING	A non-critical run-time error. Script execution not stopped
8	E_NOTE	The execution index. The script found something because it might be a bug, but it should normally happen when running an illegal program as well
256	E_USER_ERROR	Potentially fatal user error. This is similar to E_ERROR except that generates trigger_error()
512	E_USER_WARNING	A non-fatal custom video clip. This is similar to E_WARNING except that probably generated by a PHP script using the trigger_error() function