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PHP Quiz PHP CertificatePHP set_error_handler() Function
Complete PHP Error Reference
Definition and Usage
The set_error_handler() function sets a user-defined function to handle errors.
This function is used to create your own way of handling errors during runtime.
This function returns the old error handler, or NULL on failure.
Syntax
set_error_handler(error_function,error_types)
| Parameter | Description |
|---|---|
| error_function | Required. Specifies the function to be run at errors |
| error_types | Optional. Specifies on which errors report levels the user-defined error will be shown. Default is "E_ALL". See table below for possible error report levels |
error_function
Syntax
error_function(error_level,error_message,
error_file,error_line,error_context)
error_file,error_line,error_context)
| Parameter | Description |
|---|---|
| error_level | Required. Specifies the error report level for the user-defined error. Must be a value number. See table below for possible error report levels |
| error_message | Required. Specifies the error message for the user-defined error |
| error_file | Optional. Specifies the filename in which the error occurred |
| error_line | Optional. Specifies the line number in which the error occurred |
| error_context | Optional. Specifies an array that points to the active symbol table at the point the error occurred. In other words, error_context will contain an array of every variable that existed in the scope the error was triggered in |
Error Report levels
| Value | Constant | Description |
|---|---|---|
| 2 | E_WARNING | Non-fatal run-time errors. Execution of the script is not halted |
| 8 | E_NOTICE | Run-time notices. The script found something that might be an error, but could also happen when running a script normally |
| 256 | E_USER_ERROR | Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error() |
| 512 | E_USER_WARNING | Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error() |
| 1024 | E_USER_NOTICE | User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error() |
| 4096 | E_RECOVERABLE_ERROR | Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler()) |
| 8191 | E_ALL | All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PHP 6.0) |
Tips and Notes
Tip: The standard PHP error handler is completely
bypassed if this function is used, and the user-defined error handler must
terminate the script (die() ) if necessary
Note:
If errors occur before the script is executed the custom
error handler cannot be used since it is not registered at that time
Example
<?php
//error handler function
function customError($errno, $errstr, $errfile, $errline)
{
echo "<b>Custom error:</b> [$errno] $errstr<br />";
echo " Error on line $errline in $errfile<br />";
echo "Ending Script";
die();
}
//set error handler
set_error_handler("customError");
$test=2;
//trigger error
if ($test>1)
{
trigger_error("A custom error has been triggered");
}
?>
//error handler function
function customError($errno, $errstr, $errfile, $errline)
{
echo "<b>Custom error:</b> [$errno] $errstr<br />";
echo " Error on line $errline in $errfile<br />";
echo "Ending Script";
die();
}
//set error handler
set_error_handler("customError");
$test=2;
//trigger error
if ($test>1)
{
trigger_error("A custom error has been triggered");
}
?>
The output of the code above should be something like this:
Custom error: [1024] A custom error has been triggered
Error on line 19 in C:\webfolder\test.php
Ending Script
Error on line 19 in C:\webfolder\test.php
Ending Script
Complete PHP Error Reference
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