Error handling in CodeIgniter

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To prevent the application from errors, CodeIgniter provides an easy and speedy error handling mechanism.
These errors make the application irritating and complex for users.
By default, all PHP errors are displayed by Codeigniter. We can prevent these errors to display by using the error_reporting() PHP function at the top of the main index file. By disabling this function, we can prevent error log files from being written.
In the Codeigniter framework, there are several error functions. These functions are basically simple procedural interfaces that are available throughout the application.

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CodeIgniter - Error Handling

Codeigniter provides the following three methods to handles errors:

show_error()
show_404()
log_message()

1 show_error(): This function is same as error_reporting function. It displays all errors at the top of the device screen in the HTML format. The return type of this function is mixed.

Syntax:

show_error($message, $status_code, $heading = 'An Error Was Encountered');

Explanation:

$message: This parameter represents error messages. It has the type mixed.
$status_code: This parameter represents HTTP response status code. The type of this parameter is int.
$heading: This parameter represents the error heading. It can be a string.

Note:

Error templates used by this function are:

application/views/errors/html/error_general.php

application/views/errors/cli/error_general.php

2 show_404(): This function used to display the error 404 messages means it displays an error when the user trying to access a page that does not exists throughout the application. The return type of this function is void.

Syntax:

show_404($page = '', $log_error = TRUE)

Parameter Explanation:

$page: This parameter is used to represents URL string. The type of this parameter is a string.
$log_error: This parameter is used to determine whether to log the error. It is a Boolean type parameter.

Note:

Error templates used by this function are:

application/views/errors/html/error_404.php

application/views/errors/cli/error_404.php

3 log_message(): This function is used to write the error messages into log files. The return type of this method is void.

Syntax:

log_message($level, $message, $php_error = FALSE)

Parameter Description:

$level: This parameter represents log level. It has three possible values: 1. error 2. log 3. Info. It is a string-type parameter.
$message: This parameter represents the message to LOG. It is a string-type parameter.
$php_error: This parameter is used to determine whether we are logging a native PHP message or not. It is a Boolean type parameter.