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-rw-r--r--user_guide_src/source/general/common_functions.rst165
1 files changed, 69 insertions, 96 deletions
diff --git a/user_guide_src/source/general/common_functions.rst b/user_guide_src/source/general/common_functions.rst
index 8a57c183e..f8e9d775b 100644
--- a/user_guide_src/source/general/common_functions.rst
+++ b/user_guide_src/source/general/common_functions.rst
@@ -6,70 +6,65 @@ CodeIgniter uses a few functions for its operation that are globally
defined, and are available to you at any point. These do not require
loading any libraries or helpers.
-is_php()
-========
+.. contents::
+ :local:
+
+.. raw:: html
+
+ <div class="custom-index container"></div>
.. function:: is_php($version = '5.3.0')
:param string $version: Version number
:returns: bool
-Determines of the PHP version being used is greater than the
-supplied version number.
+ Determines of the PHP version being used is greater than the
+ supplied version number.
-Example::
+ Example::
- if (is_php('5.3'))
- {
- $str = quoted_printable_encode($str);
- }
+ if (is_php('5.3'))
+ {
+ $str = quoted_printable_encode($str);
+ }
-Returns boolean TRUE if the installed version of PHP is equal to or
-greater than the supplied version number. Returns FALSE if the installed
-version of PHP is lower than the supplied version number.
+ Returns boolean TRUE if the installed version of PHP is equal to or
+ greater than the supplied version number. Returns FALSE if the installed
+ version of PHP is lower than the supplied version number.
-is_really_writable()
-====================
+ .. function:: is_really_writable($file)
-.. function:: is_really_writable($file)
-
- :param string $file: File path
- :returns: bool
+ :param string $file: File path
+ :returns: bool
-``is_writable()`` returns TRUE on Windows servers when you really can't
-write to the file as the OS reports to PHP as FALSE only if the
-read-only attribute is marked.
+ ``is_writable()`` returns TRUE on Windows servers when you really can't
+ write to the file as the OS reports to PHP as FALSE only if the
+ read-only attribute is marked.
-This function determines if a file is actually writable by attempting
-to write to it first. Generally only recommended on platforms where
-this information may be unreliable.
+ This function determines if a file is actually writable by attempting
+ to write to it first. Generally only recommended on platforms where
+ this information may be unreliable.
-Example::
+ Example::
- if (is_really_writable('file.txt'))
- {
- echo "I could write to this if I wanted to";
- }
- else
- {
- echo "File is not writable";
- }
-
-config_item()
-=============
+ if (is_really_writable('file.txt'))
+ {
+ echo "I could write to this if I wanted to";
+ }
+ else
+ {
+ echo "File is not writable";
+ }
.. function:: config_item($key)
:param string $key: Config item key
:returns: mixed
-The :doc:`Config Library <../libraries/config>` is the preferred way of
-accessing configuration information, however ``config_item()`` can be used
-to retrieve single keys. See :doc:`Config Library <../libraries/config>`
-documentation for more information.
-
-show_error()
-============
+ The :doc:`Config Library <../libraries/config>` is the preferred way of
+ accessing configuration information, however ``config_item()`` can be used
+ to retrieve single keys. See :doc:`Config Library <../libraries/config>`
+ documentation for more information.
.. function:: show_error($message, $status_code, $heading = 'An Error Was Encountered')
@@ -78,11 +73,8 @@ show_error()
:param string $heading: Error page heading
:returns: void
-This function calls ``CI_Exception::show_error()``. For more info,
-please see the :doc:`Error Handling <errors>` documentation.
-
-show_404()
-==========
+ This function calls ``CI_Exception::show_error()``. For more info,
+ please see the :doc:`Error Handling <errors>` documentation.
.. function:: show_404($page = '', $log_error = TRUE)
@@ -90,11 +82,8 @@ show_404()
:param bool $log_error: Whether to log the error
:returns: void
-This function calls ``CI_Exception::show_404()``. For more info,
-please see the :doc:`Error Handling <errors>` documentation.
-
-log_message()
-=============
+ This function calls ``CI_Exception::show_404()``. For more info,
+ please see the :doc:`Error Handling <errors>` documentation.
.. function:: log_message($level, $message, $php_error = FALSE)
@@ -103,11 +92,8 @@ log_message()
:param bool $php_error: Whether we're logging a native PHP error message
:returns: void
-This function is an alias for ``CI_Log::write_log()``. For more info,
-please see the :doc:`Error Handling <errors>` documentation.
-
-set_status_header()
-===============================
+ This function is an alias for ``CI_Log::write_log()``. For more info,
+ please see the :doc:`Error Handling <errors>` documentation.
.. function:: set_status_header($code, $text = '')
@@ -115,16 +101,13 @@ set_status_header()
:param string $text: A custom message to set with the status code
:returns: void
-Permits you to manually set a server status header. Example::
-
- set_status_header(401);
- // Sets the header as: Unauthorized
+ Permits you to manually set a server status header. Example::
-`See here <http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html>`_ for
-a full list of headers.
+ set_status_header(401);
+ // Sets the header as: Unauthorized
-remove_invisible_characters()
-=============================
+ `See here <http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html>`_ for
+ a full list of headers.
.. function:: remove_invisible_characters($str, $url_encoded = TRUE)
@@ -132,47 +115,37 @@ remove_invisible_characters()
:param bool $url_encoded: Whether to remove URL-encoded characters as well
:returns: string
-This function prevents inserting NULL characters between ASCII
-characters, like Java\\0script.
+ This function prevents inserting NULL characters between ASCII
+ characters, like Java\\0script.
-Example::
+ Example::
- remove_invisible_characters('Java\\0script');
- // Returns: 'Javascript'
-
-html_escape()
-=============
+ remove_invisible_characters('Java\\0script');
+ // Returns: 'Javascript'
.. function:: html_escape($var)
- :param mixed $var: Variable to escape
- (string or array)
+ :param mixed $var: Variable to escape (string or array)
:returns: mixed
-This function acts as an alias for PHP's native ``htmlspecialchars()``
-function, with the advantage of being able to accept an array of strings.
-
-It is useful in preventing Cross Site Scripting (XSS).
+ This function acts as an alias for PHP's native ``htmlspecialchars()``
+ function, with the advantage of being able to accept an array of strings.
-get_mimes()
-===========
+ It is useful in preventing Cross Site Scripting (XSS).
.. function:: get_mimes()
:returns: array
-This function returns a *reference* to the MIMEs array from
-*application/config/mimes.php*.
-
-is_https()
-==========
+ This function returns a *reference* to the MIMEs array from
+ *application/config/mimes.php*.
.. function:: is_https()
:returns: bool
-Returns TRUE if a secure (HTTPS) connection is used and FALSE
-in any other case (including non-HTTP requests).
+ Returns TRUE if a secure (HTTPS) connection is used and FALSE
+ in any other case (including non-HTTP requests).
function_usable()
=================
@@ -182,12 +155,12 @@ function_usable()
:param string $function_name: Function name
:returns: bool
-Returns TRUE if a function exists and is usable, FALSE otherwise.
+ Returns TRUE if a function exists and is usable, FALSE otherwise.
-This function runs a ``function_exists()`` check and if the
-`Suhosin extension <http://www.hardened-php.net/suhosin/>` is loaded,
-checks if it doesn't disable the function being checked.
+ This function runs a ``function_exists()`` check and if the
+ `Suhosin extension <http://www.hardened-php.net/suhosin/>` is loaded,
+ checks if it doesn't disable the function being checked.
-It is useful if you want to check for the availability of functions
-such as ``eval()`` and ``exec()``, which are dangerous and might be
-disabled on servers with highly restrictive security policies. \ No newline at end of file
+ It is useful if you want to check for the availability of functions
+ such as ``eval()`` and ``exec()``, which are dangerous and might be
+ disabled on servers with highly restrictive security policies. \ No newline at end of file