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- PHP mysqli Tutorial
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PHP error_reporting() | Enable/Disable Error Reporting
With PHP's error_reporting() function, we can choose which errors should be shown. For example:
<?php error_reporting(0); echo "<BR>Before \$x<BR>"; echo $x; echo "<BR>After \$x<BR>"; ?>
The output produced by the above PHP example using the error_reporting() function is shown in the snapshot given below:
Notice the $x that is not defined. But there is no error displayed in the web browser. It is because I have turned off the reporting of all errors using the first statement, which is error_reporting(0); But if I remove this statement, then the output should be:
PHP error_reporting() Syntax
The syntax of the error_reporting() function in PHP is:
error_reporting(level);
The level parameter is optional and is used to specify the error reporting level. List of predefined error constantsalong with its description, is given in the following table:
| Value Constant | Named Constant | Description |
|---|---|---|
| 1 | E_ERROR | Used to report only fatal run-time errors. After reporting a fatal error, the remaining execution of the script halts. |
| 2 | E_WARNING | Used to report only run-time warnings. After reporting a run-time error, the remaining execution of the script continues. |
| 4 | E_PARSE | Used to report only Compile-time parsing errors |
| 8 | E_NOTICE | Used to report run-time notices, not errors. |
| 16 | E_CORE_ERROR | Used to report fatal errors at startup. It is similar to E_ERROR. It is generated through core PHP. |
| 32 | E_CORE_WARNING | Used to report Non-fatal errors at startup. It is similar to E_WARNING. It is generated through core PHP. |
| 64 | E_COMPILE_ERROR | Used to report Fatal compile-time errors It is similar to E_ERROR. It is generated by the Zend engine. |
| 128 | E_COMPILE_WARNING | Used to report Non-fatal compile-time errors. It is similar to E_WARNING. It is also generated by the Zend engine. |
| 256 | E_USER_ERROR | Used to report Fatal user-generated error. It is similar to E_ERROR. It is generated through trigger_error(). |
| 512 | E_USER_WARNING | Used to report Non-fatal, user-generated warning. It is similar to E_WARNING. It is also generated by trigger_error(). |
| 1024 | E_USER_NOTICE | Used to report user-generated notices. It is similar to E_NOTICE. It is also generated by trigger_error(). |
| 2048 | E_STRICT | Used when we need to allow the PHP engine to suggest some changes that can be made in our PHP code for interoperability and backward compatibility. |
| 4096 | E_RECOVERABLE_ERROR | Used to report only Catchable fatal error. Used to report some dangerous errors (if any). |
| 8192 | E_DEPRECATED | Used to report run-time notices. Used to report some notices about the code that may not work in upcoming versions of PHP. |
| 16384 | E_USER_DEPRECATED | Used to report only user-generated warning messages. It is similar to E_DEPRECATED. It is generated by trigger_error(). |
| 32767 | E_ALL | Used to report all errors and warnings |
Advantages of the error_reporting() function in PHP
- The error reporting() function can assist in the debugging of your PHP code by reporting any errors that occur during execution.
- Setting the error reporting() level to E ALL allows you to identify and fix security flaws in your code.
- By excluding non-critical errors from the error reporting() level, you can improve the performance of your PHP application by reducing the amount of unnecessary error handling.
- Certain coding standards and security frameworks may require that certain error reporting() levels be set, making compliance easier.
Disadvantages of the error_reporting() function in PHP
- If the error reporting() level is set too high, it can reveal sensitive information about your server, database, or application, which attackers could exploit.
- If the error reporting() level is set too high, a large number of error logs will be generated, making it difficult to identify important errors.
- Critical errors may be hidden if the error reporting() level is set too low, making it difficult to identify and fix problems in your code.
- Other settings, such as display errors and log errors, can affect the error reporting() function, resulting in inconsistent error reporting behavior.
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