CodeIgniter Common Functions - CodeIgniter

What is CodeIgniter Common Functions?

CodeIgniter library functions and helper capabilities need to be initialized before they may be used however there are a few common features, which do now not need to be initialized.

These common functions and their descriptions are given beneath.

Syntax

is_php($version)

Parameters

$version(string) − Version number

Return

TRUE if the running PHP version is at least the one specified or FALSE if not

Return Type

void

Description

Determines if the PHP version being used is greater than the supplied version number.

Syntax

is_really_writable($file)

Parameters

$file(string) − File path

Return

TRUE if the path is writable, FALSE if not

Return Type

bool

Description

checks to see if file is writable or not.

Syntax

config_item($key)

Parameters

$key(string) − Config item key

Return

Configuration key value or NULL if not found

Return Type

mixed

Description

This function is used to get the configuration item

Syntax

set_status_header($code[,$text = ''])

Parameters

$code(int) − HTTP Response status code

$text(string) − A custom message to set with the status code

Return

Return Type

void

Description

This function permits you to manually set a server status header.

Syntax

remove_invisible_characters($str[,$url_encoded = TRUE])

Parameters

$str(string) − Input string

$url_encoded(bool) − Whether to remove URLencoded characters as well

Return

Sanitized string

Return Type

string

Description

This function prevents inserting NULL characters between ASCII characters

Syntax

html_escape($var)

Parameters

$var(mixed) − Variable to escape (string or array)

Return

HTML escaped string(s)

Return Type

mixed

Description

This function acts as a native PHP htmlspecialchars() function.

Syntax

get_mimes()

Return

An associative array of file types

Return Type

array

Description

This function returns a reference to the MIMEs array fromapplication/config/mimes.php.

Syntax

is_https()

Return

TRUE if currently using HTTP-over-SSL, FALSE if not

Return Type

bool

Description

Returns TRUE if a secure (HTTPS) connection is used and FALSE in any other case (including non-HTTP requests).

Syntax

is_cli()

Return

TRUE if currently running under CLI, FALSE otherwise

Return Type

bool

Description

Returns TRUE if the application is run through the command line and FALSE if not.

Syntax

function_usable($function_name)

Parameters

$function_name(string) − Function name

Return Type

bool

Description

Returns TRUE if a function exists and is usable, FALSE otherwise.

Given below is an example, which demonstrates all of the above functions.

Example

Here we have created only one controller in which we will use the above functions. Copy the below given code and save it at application/controller/CommonFun_Controller.php.


Change the routes.php file at application/config/routes.php to add route for the above controller and add the following line at the end of the file.

Type the following URL in the address bar of your browser to execute the example.


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