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adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]3<head>
4
Derek Allard404e35d2007-08-07 01:00:45 +0000[diff] [blame]5<title>CodeIgniter User Guide : URL Helper</title>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]6
7<style type='text/css' media='all'>@import url('../userguide.css');</style>
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Derek Allard3d879d52008-01-18 19:41:32 +0000[diff] [blame]19<meta name='author' content='ExpressionEngine Dev Team' />
Derek Allardd2df9bc2007-04-15 17:41:17 +0000[diff] [blame]20<meta name='description' content='CodeIgniter User Guide' />
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Derek Allard197d10b2008-02-12 04:20:38 +0000[diff] [blame]31<td><h1>CodeIgniter User Guide Version 1.6.1</h1></td>
adminc0d5d522006-10-30 19:40:35 +0000[diff] [blame]32<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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42<td id="breadcrumb">
Derek Jones7a9193a2008-01-21 18:39:20 +0000[diff] [blame]43<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]44<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
45URL Helper
46</td>
Derek Allardbc030912007-06-24 18:25:29 +0000[diff] [blame]47<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]48</tr>
49</table>
50<!-- END BREADCRUMB -->
51
52<br clear="all" />
53
54
55<!-- START CONTENT -->
56<div id="content">
57
58
59<h1>URL Helper</h1>
60
61<p>The URL Helper file contains functions that assist in working with URLs.</p>
62
63
64<h2>Loading this Helper</h2>
65
66<p>This helper is loaded using the following code:</p>
67<code>$this->load->helper('url');</code>
68
69<p>The following functions are available:</p>
70
71<h2>site_url()</h2>
72
73<p>Returns your site URL, as specified in your config file. The index.php file (or whatever you have set as your
74site <dfn>index_page</dfn> in your config file) will be added to the URL, as will any URI segments you pass to the function.</p>
75
admine334c472006-10-21 19:44:22 +0000[diff] [blame]76<p>You are encouraged to use this function any time you need to generate a local URL so that your pages become more portable
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]77in the event your URL changes.</p>
78
79<p>Segments can be optionally passed to the function as a string or an array. Here is a string example:</p>
80
81<code>echo site_url("news/local/123");</code>
82
83<p>The above example would return something like: http://www.your-site.com/index.php/news/local/123</p>
84
85<p>Here is an example of segments passed as an array:</p>
86
87<code>
88$segments = array('news', 'local', '123');<br />
89<br />
90echo site_url($segments);</code>
91
92
93<h2>base_url()</h2>
94<p>Returns your site base URL, as specified in your config file. Example:</p>
95<code>echo base_url();</code>
96
97
98<h2>index_page()</h2>
99<p>Returns your site "index" page, as specified in your config file. Example:</p>
100<code>echo index_page();</code>
101
102
103
104<h2>anchor()</h2>
105
106<p>Creates a standard HTML anchor link based on your local site URL:</p>
107
108<code>&lt;a href="http://www.your-site.com">Click Here&lt;/a></code>
109
110<p>The tag has three optional parameters:</p>
111
112<code>anchor(<var>uri segments</var>, <var>text</var>, <var>attributes</var>)</code>
113
114<p>The first parameter can contain any segments you wish appended to the URL. As with the <dfn>site_url()</dfn> function above,
adminb071bb52006-08-26 19:28:37 +0000[diff] [blame]115segments can be a string or an array.</p>
116
117<p><strong>Note:</strong>&nbsp; If you are building links that are internal to your application do not include the base URL (http://...). This
118will be added automatically from the information specified in your config file. Include only the URI segments you wish appended to the URL.</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]119
120<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>
121
122<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>
123
124<p>Here are some examples:</p>
125
Derek Allardc4e9dc92007-02-06 19:52:30 +0000[diff] [blame]126<code>echo anchor('news/local/123', 'My News');</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]127
128<p>Would produce: &lt;a href="http://www.your-site.com/index.php/news/local/123" title="My News">My News&lt;/a></p>
129
Derek Allardc4e9dc92007-02-06 19:52:30 +0000[diff] [blame]130<code>echo anchor('news/local/123', 'My News', array('title' => 'The best news!'));</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]131
132<p>Would produce: &lt;a href="http://www.your-site.com/index.php/news/local/123" title="The best news!">My News&lt;/a></p>
133
134
135<h2>anchor_popup()</h2>
136
admine334c472006-10-21 19:44:22 +0000[diff] [blame]137<p>Nearly identical to the <dfn>anchor()</dfn> function except that it opens the URL in a new window.
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]138
admine334c472006-10-21 19:44:22 +0000[diff] [blame]139You can specify JavaScript window attributes in the third parameter to control how the window is opened. If
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]140the third parameter is not set it will simply open a new window with your own browser settings. Here is an example
141with attributes:</p>
142
143<code>
144
145$atts = array(<br />
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'width'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> '800',<br />
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'height'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> '600',<br />
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'scrollbars' => 'yes',<br />
149&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'status'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> 'yes',<br />
150&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'resizable'&nbsp;&nbsp;=> 'yes',<br />
151&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'screenx'&nbsp;&nbsp;&nbsp;&nbsp;=> '0',<br />
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'screeny'&nbsp;&nbsp;&nbsp;&nbsp;=> '0'<br />
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
154<br />
Derek Allard9967ab42008-02-13 13:14:47 +0000[diff] [blame^]155echo anchor_popup('news/local/123', 'Click Me!', $atts);</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]156
157<p>Note: The above attributes are the function defaults so you only need to set the ones that are different from what you need.
158If you want the function to use all of its defaults simply pass an empty array in the third parameter:</p>
159
Derek Allardc4e9dc92007-02-06 19:52:30 +0000[diff] [blame]160<code>echo anchor_popup('news/local/123', 'Click Me!', array());</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]161
162
163<h2>mailto()</h2>
164
165<p>Creates a standard HTML email link. Usage example:</p>
166
167<code>echo mailto('me@my-site.com', 'Click Here to Contact Me');</code>
168
169<p>As with the <dfn>anchor()</dfn> tab above, you can set attributes using the third parameter.</p>
170
171
172<h2>safe_mailto()</h2>
173
174<p>Identical to the above function except it writes an obfuscated version of the mailto tag using ordinal numbers
175written with JavaScript to help prevent the email address from being harvested by spam bots.</p>
176
177
178<h2>auto_link()</h2>
179
180<p>Automatically turns URLs and email addresses contained in a string into links. Example:</p>
181
182<code>$string = auto_link($string);</code>
183
184<p>The second parameter determines whether URLs and emails are converted or just one or the other. Default behavior is both
185if the parameter is not specified</p>
186
187<p>Converts only URLs:</p>
188<code>$string = auto_link($string, 'url');</code>
189
190<p>Converts only Email addresses:</p>
191<code>$string = auto_link($string, 'email');</code>
192
193</p>The third parameter determines whether links are shown in a new window. The value can be TRUE or FALSE (boolean):</p>
194<code>$string = auto_link($string, 'both', TRUE);</code>
195
196
197<h2>url_title()</h2>
198<p>Takes a string as input and creates a human-friendly URL string. This is useful if, for example, you have a blog
199in which you'd like to use the title of your entries in the URL. Example:</p>
200
201<code>$title = "What's wrong with CSS?";<br />
202<br />
203$url_title = url_title($title);<br />
204<br />
205// Produces: whats-wrong-with-css
206</code>
207
208
209<p>The second parameter determines the word delimiter. By default dashes are used. Options are: <dfn>dash</dfn>, or <dfn>underscore</dfn>:</p>
210
211<code>$title = "What's wrong with CSS?";<br />
212<br />
213$url_title = url_title($title, 'underscore');<br />
214<br />
215// Produces: whats_wrong_with_css
216</code>
217
218
219<h3>prep_url()</h3>
220<p>This function will add <kbd>http://</kbd> in the event it is missing from a URL. Pass the URL string to the function like this:</p>
221<code>
Derek Allard8788d4b2007-08-08 17:04:40 +0000[diff] [blame]222$url = "www.example.com";<br /><br />
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]223$url = prep_url($url);</code>
224
225
226
227
228<h2>redirect()</h2>
229
230<p>Does a "header redirect" to the local URI specified. Just like other functions in this helper, this one is designed
231to redirect to a local URL within your site. You will <strong>not</strong> specify the full site URL, but rather simply the URI segments
232to the controller you want to direct to. The function will build the URL based on your config file values.</p>
233
admine334c472006-10-21 19:44:22 +0000[diff] [blame]234<p>The second parameter allows you to choose between the "location"
Derek Allard00aa71c2007-10-17 14:45:36 +0000[diff] [blame]235method (default) or the "refresh" method. Location is faster, but on Windows servers it can sometimes be a problem. Example:</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]236
237<code>if ($logged_in == FALSE)<br />
238{<br />
239&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;redirect('/login/form/', 'refresh');<br />
240}</code>
241
242<p class="important"><strong>Note:</strong> In order for this function to work it must be used before anything is outputted
243to the browser since it utilizes server headers.</p>
244
245
246
247
248
249
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Derek Allardc6441282007-07-04 23:54:32 +0000[diff] [blame]261</p>
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