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Learn how to use PHP error_reporting Function
Introduction
Here, On this Page, I'm Publishing Some information about error_reporting function in PHP including Definition, Syntax, Usage, Examples, Parameter Constants, Return Output and some related details associated with it. PHP error_reporting function simplifies our work of changing default behavior of "PHP Errors" directly from our scripts without editing the core "php.ini" configuration file. This function is a part of core "error_handling functions" in PHP which allows us to define our own error handling rules suiting our needs.
Definition and Usage
The error_reporting function allows us set levels of error (in PHP) to be displayed on screen for the particular duration (runtime) of our script.
Syntax of error_reporting Function
int error_reporting ([ int $level ] );
In the above syntax,
- First "int" indicates the data type of return value (function output),
- Second "int" indicates the data type of parameter that this function will accept including predefined parameter constants.
- $level is the parameter of error_reporting function which takes on either a bitmask or predefined named constants. As per the PHP official statement, named constants are suggested to ensure compatibility with future versions of PHP.
Latest Predefined Constants, Bitmasks and Description
Bitmasks
| Named Constant
| Short Description
|
|---|---|---|
1
| E_ERROR
| Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted.
|
2
| E_WARNING
| Run-time warnings (non-fatal errors). Execution of the script is not halted.
|
4
| E_PARSE
| Compile-time parse errors. Parse errors should only be generated by the parser.
|
8
| E_NOTICE
| Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.
|
16
| E_CORE_ERROR
| Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.
|
32
| E_CORE_WARNING
| Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.
|
64
| E_COMPILE_ERROR
| Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.
|
128
| E_COMPILE_WARNING
| Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine.
|
256
| E_USER_ERROR
| User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error().
|
512
| E_USER_WARNING
| User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error().
|
1024
| E_USER_NOTICE
| User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error().
|
2048
| E_STRICT
| Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code.
|
4096
| E_RECOVERABLE_ERROR
| Catchable fatal error. It indicates that a probably dangerous error occured, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.
|
8192
| E_DEPRECATED
| Run-time notices. Enable this to receive warnings about code that will not work in future versions.
|
16384
| E_USER_DEPRECATED
| User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error().
|
30719
| E_ALL
| All errors and warnings, as supported, except of level E_STRICT.
|
Return Output/Values
- Returns the old error_reporting level or the current level if no "level" parameter is given.
Example of error_reporting Function
<?php
// Turn off all error reporting
error_reporting(0);
// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);
// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
// Report all errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);
// Report all PHP errors (see changelog)
error_reporting(E_ALL);
// Report all PHP errors
error_reporting(-1);
// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
?>
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Tip
- Passing in the value -1 as parameter will show every possible error, even when new levels and constants are added in future PHP versions.
