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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<p>The URL Helper file contains functions that assist in working with URLs.</p>
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<h2>Loading this Helper</h2>
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<p>This helper is loaded using the following code:</p>
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<code>$this->load->helper('url');</code>
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<p>The following functions are available:</p>
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<p>Returns your site URL, as specified in your config file. The index.php file (or whatever you have set as your
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site <dfn>index_page</dfn> in your config file) will be added to the URL, as will any URI segments you pass to the function, and the <dfn>url_suffix</dfn> as set in your config file.</p>
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<p>You are encouraged to use this function any time you need to generate a local URL so that your pages become more portable
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in the event your URL changes.</p>
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<p>Segments can be optionally passed to the function as a string or an array. Here is a string example:</p>
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<code>echo site_url("news/local/123");</code>
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<p>The above example would return something like: http://example.com/index.php/news/local/123</p>
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<p>Here is an example of segments passed as an array:</p>
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$segments = array('news', 'local', '123');<br />
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echo site_url($segments);</code>
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<p>Returns your site base URL, as specified in your config file. Example:</p>
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<code>echo base_url();</code>
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<p>This function returns the same thing as site_url, without the <dfn>index_page</dfn> or <dfn>url_suffix</dfn> being appended.</p>
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<p>Also like site_url, you can supply segments as a string or an array. Here is a string example:</p>
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<code>echo base_url("blog/post/123");</code>
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<p>The above example would return something like: http://example.com/blog/post/123</p>
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<p>This is useful because unlike site_url(), you can supply a string to a file, such as an image or stylesheet. For example:</p>
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<code>echo base_url("images/icons/edit.png");</code>
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<p>This would give you something like: http://example.com/images/icons/edit.png</p>
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<h2>current_url()</h2>
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<p>Returns the full URL (including segments) of the page being currently viewed.</p>
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<h2>uri_string()</h2>
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<p>Returns the URI segments of any page that contains this function. For example, if your URL was this:</p>
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<code>http://some-site.com/blog/comments/123</code>
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<p>The function would return:</p>
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<code>/blog/comments/123</code>
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<h2>index_page()</h2>
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<p>Returns your site "index" page, as specified in your config file. Example:</p>
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<code>echo index_page();</code>
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<p>Creates a standard HTML anchor link based on your local site URL:</p>
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<code><a href="http://example.com">Click Here</a></code>
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<p>The tag has three optional parameters:</p>
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<code>anchor(<var>uri segments</var>, <var>text</var>, <var>attributes</var>)</code>
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<p>The first parameter can contain any segments you wish appended to the URL. As with the <dfn>site_url()</dfn> function above,
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segments can be a string or an array.</p>
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<p><strong>Note:</strong> If you are building links that are internal to your application do not include the base URL (http://...). This
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will be added automatically from the information specified in your config file. Include only the URI segments you wish appended to the URL.</p>
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<p>The second segment is the text you would like the link to say. If you leave it blank, the URL will be used.</p>
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<p>The third parameter can contain a list of attributes you would like added to the link. The attributes can be a simple string or an associative array.</p>
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<p>Here are some examples:</p>
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<code>echo anchor('news/local/123', 'My News', 'title="News title"');</code>
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<p>Would produce: <a href="http://example.com/index.php/news/local/123" title="News title">My News</a></p>
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<code>echo anchor('news/local/123', 'My News', array('title' => 'The best news!'));</code>
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<p>Would produce: <a href="http://example.com/index.php/news/local/123" title="The best news!">My News</a></p>
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<h2>anchor_popup()</h2>
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<p>Nearly identical to the <dfn>anchor()</dfn> function except that it opens the URL in a new window.
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You can specify JavaScript window attributes in the third parameter to control how the window is opened. If
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the third parameter is not set it will simply open a new window with your own browser settings. Here is an example
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'width' => '800',<br />
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'height' => '600',<br />
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'scrollbars' => 'yes',<br />
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'status' => 'yes',<br />
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'resizable' => 'yes',<br />
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'screenx' => '0',<br />
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'screeny' => '0'<br />
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);<br />
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echo anchor_popup('news/local/123', 'Click Me!', $atts);</code>
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<p>Note: The above attributes are the function defaults so you only need to set the ones that are different from what you need.
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If you want the function to use all of its defaults simply pass an empty array in the third parameter:</p>
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<code>echo anchor_popup('news/local/123', 'Click Me!', array());</code>
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<p>Creates a standard HTML email link. Usage example:</p>
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<code>echo mailto('me@my-site.com', 'Click Here to Contact Me');</code>
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<p>As with the <dfn>anchor()</dfn> tab above, you can set attributes using the third parameter.</p>
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<h2>safe_mailto()</h2>
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<p>Identical to the above function except it writes an obfuscated version of the mailto tag using ordinal numbers
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written with JavaScript to help prevent the email address from being harvested by spam bots.</p>
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<p>Automatically turns URLs and email addresses contained in a string into links. Example:</p>
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<code>$string = auto_link($string);</code>
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<p>The second parameter determines whether URLs and emails are converted or just one or the other. Default behavior is both
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if the parameter is not specified. Email links are encoded as safe_mailto() as shown above.</p>
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<p>Converts only URLs:</p>
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<code>$string = auto_link($string, 'url');</code>
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<p>Converts only Email addresses:</p>
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<code>$string = auto_link($string, 'email');</code>
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<p>The third parameter determines whether links are shown in a new window. The value can be TRUE or FALSE (boolean):</p>
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<code>$string = auto_link($string, 'both', TRUE);</code>
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<p>Takes a string as input and creates a human-friendly URL string. This is useful if, for example, you have a blog
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in which you'd like to use the title of your entries in the URL. Example:</p>
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<code>$title = "What's wrong with CSS?";<br />
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$url_title = url_title($title);<br />
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// Produces: Whats-wrong-with-CSS
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<p>The second parameter determines the word delimiter. By default dashes are used.</p>
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<code>$title = "What's wrong with CSS?";<br />
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$url_title = url_title($title, '_');<br />
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// Produces: Whats_wrong_with_CSS
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<p>The third parameter determines whether or not lowercase characters are forced. By default they are not. Options are boolean <dfn>TRUE</dfn>/<dfn>FALSE</dfn>:</p>
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<code>$title = "What's wrong with CSS?";<br />
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$url_title = url_title($title, '_', TRUE);<br />
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// Produces: whats_wrong_with_css
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<p>This function will add <kbd>http://</kbd> in the event that a scheme is missing from a URL. Pass the URL string to the function like this:</p>
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$url = "example.com";<br /><br />
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$url = prep_url($url);</code>
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<p>Does a "header redirect" to the URI specified. If you specify the full site URL that link will be build, but for local links simply providing the URI segments
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to the controller you want to direct to will create the link. The function will build the URL based on your config file values.</p>
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<p>The optional second parameter allows you to choose between the "location"
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method (default) or the "refresh" method. Location is faster, but on Windows servers it can sometimes be a problem. The optional third parameter allows you to send a specific HTTP Response Code - this could be used for example to create 301 redirects for search engine purposes. The default Response Code is 302. The third parameter is <em>only</em> available with 'location' redirects, and not 'refresh'. Examples:</p>
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<code>if ($logged_in == FALSE)<br />
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redirect('/login/form/', 'refresh');<br />
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// with 301 redirect<br />
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redirect('/article/13', 'location', 301);</code>
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<p class="important"><strong>Note:</strong> In order for this function to work it must be used before anything is outputted
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to the browser since it utilizes server headers.<br />
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<strong>Note:</strong> For very fine grained control over headers, you should use the <a href="../libraries/output.html">Output Library</a>'s set_header() function.</p>
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