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Error Handling
Normally, when an error occurs in a PHP script, the error message is inserted into the script's output. If the error is fatal, the script execution stops.
Changing Error Reporting
By default, all conditions except runtime notices are caught and displayed to the user. You can change this behavior globally in your php.ini file with the error_reporting option. You can also locally change the error-reporting behavior in a script using the error_reporting() function.
With both of these, you set the conditions that are caught and displayed by using the various bitwise operators for combinations.
Example - all error-level options:
(E_ERROR | E_PARSE | E_CORE_ERROR | E_COMPILE_ERROR | E_USER_ERROR)
Example - all options except runtime notices:
(E_ALL & ~E_NOTICE)
Error Reporting Values
| Value | Meaning |
|---|---|
| E_ERROR | Runtime errors |
| E_WARNING | Runtime warnings |
| E_PARSE | Compile-time parse errors |
| E_NOTICE | Runtime notices |
| E_CORE_ERROR | Errors generated internally by PHP |
| E_CORE_WARNING | Warnings generated internally by PHP |
| E_COMPILE_ERROR | Errors generated internally by the Zend scripting engine |
| E_COMPILE_WARNING | Warnings generated internally by the Zend scripting engine |
| E_USER_ERROR | Runtime errors generated by a call to trigger_error() |
| E_USER_WARNING | Runtime warnings generated by a call to trigger_error() |
| E_USER_NOTICE | Runtime warnings generated by a call to trigger_error() |
| E_ALL | All of the above options |
Error Suppression
- disable error messages for a single expression:
- $value = @(2 / 0);
- turn off error reporting entirely:
- error_reporting(0);
Triggering Errors
trigger_error(message [, type]);
* the second parameter is the condition level, which is either E_USER_ERROR, E_USER_WARNING, or E_USER_NOTICE (the default)
Defining Error Handlers
