1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>URL Helper : CodeIgniter User Guide</title>
<style type='text/css' media='all'>@import url('../userguide.css');</style>
<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
<script type="text/javascript" src="../nav/nav.js"></script>
<script type="text/javascript" src="../nav/prototype.lite.js"></script>
<script type="text/javascript" src="../nav/moo.fx.js"></script>
<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
<meta http-equiv='expires' content='-1' />
<meta http-equiv= 'pragma' content='no-cache' />
<meta name='robots' content='all' />
<meta name='author' content='ExpressionEngine Dev Team' />
<meta name='description' content='CodeIgniter User Guide' />
</head>
<body>
<!-- START NAVIGATION -->
<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
<div id="masthead">
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td><h1>CodeIgniter User Guide Version 2.1.1</h1></td>
<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
</tr>
</table>
</div>
<!-- END NAVIGATION -->
<!-- START BREADCRUMB -->
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td id="breadcrumb">
<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
<a href="../index.html">User Guide Home</a> ›
URL Helper
</td>
<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 <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
</tr>
</table>
<!-- END BREADCRUMB -->
<br clear="all" />
<!-- START CONTENT -->
<div id="content">
<h1>URL Helper</h1>
<p>The URL Helper file contains functions that assist in working with URLs.</p>
<h2>Loading this Helper</h2>
<p>This helper is loaded using the following code:</p>
<code>$this->load->helper('url');</code>
<p>The following functions are available:</p>
<h2>site_url()</h2>
<p>Returns your site URL, as specified in your config file. The index.php file (or whatever you have set as your
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>
<p>You are encouraged to use this function any time you need to generate a local URL so that your pages become more portable
in the event your URL changes.</p>
<p>Segments can be optionally passed to the function as a string or an array. Here is a string example:</p>
<code>echo site_url("news/local/123");</code>
<p>The above example would return something like: http://example.com/index.php/news/local/123</p>
<p>Here is an example of segments passed as an array:</p>
<code>
$segments = array('news', 'local', '123');<br />
<br />
echo site_url($segments);</code>
<h2>base_url()</h2>
<p>Returns your site base URL, as specified in your config file. Example:</p>
<code>echo base_url();</code>
<p>This function returns the same thing as site_url, without the <dfn>index_page</dfn> or <dfn>url_suffix</dfn> being appended.</p>
<p>Also like site_url, you can supply segments as a string or an array. Here is a string example:</p>
<code>echo base_url("blog/post/123");</code>
<p>The above example would return something like: http://example.com/blog/post/123</p>
<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>
<code>echo base_url("images/icons/edit.png");</code>
<p>This would give you something like: http://example.com/images/icons/edit.png</p>
<h2>current_url()</h2>
<p>Returns the full URL (including segments) of the page being currently viewed.</p>
<h2>uri_string()</h2>
<p>Returns the URI segments of any page that contains this function. For example, if your URL was this:</p>
<code>http://some-site.com/blog/comments/123</code>
<p>The function would return:</p>
<code>/blog/comments/123</code>
<h2>index_page()</h2>
<p>Returns your site "index" page, as specified in your config file. Example:</p>
<code>echo index_page();</code>
<h2>anchor()</h2>
<p>Creates a standard HTML anchor link based on your local site URL:</p>
<code><a href="http://example.com">Click Here</a></code>
<p>The tag has three optional parameters:</p>
<code>anchor(<var>uri segments</var>, <var>text</var>, <var>attributes</var>)</code>
<p>The first parameter can contain any segments you wish appended to the URL. As with the <dfn>site_url()</dfn> function above,
segments can be a string or an array.</p>
<p><strong>Note:</strong> If you are building links that are internal to your application do not include the base URL (http://...). This
will be added automatically from the information specified in your config file. Include only the URI segments you wish appended to the URL.</p>
<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>
<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>
<p>Here are some examples:</p>
<code>echo anchor('news/local/123', 'My News', 'title="News title"');</code>
<p>Would produce: <a href="http://example.com/index.php/news/local/123" title="News title">My News</a></p>
<code>echo anchor('news/local/123', 'My News', array('title' => 'The best news!'));</code>
<p>Would produce: <a href="http://example.com/index.php/news/local/123" title="The best news!">My News</a></p>
<h2>anchor_popup()</h2>
<p>Nearly identical to the <dfn>anchor()</dfn> function except that it opens the URL in a new window.
You can specify JavaScript window attributes in the third parameter to control how the window is opened. If
the third parameter is not set it will simply open a new window with your own browser settings. Here is an example
with attributes:</p>
<code>
$atts = array(<br />
'width' => '800',<br />
'height' => '600',<br />
'scrollbars' => 'yes',<br />
'status' => 'yes',<br />
'resizable' => 'yes',<br />
'screenx' => '0',<br />
'screeny' => '0'<br />
);<br />
<br />
echo anchor_popup('news/local/123', 'Click Me!', $atts);</code>
<p>Note: The above attributes are the function defaults so you only need to set the ones that are different from what you need.
If you want the function to use all of its defaults simply pass an empty array in the third parameter:</p>
<code>echo anchor_popup('news/local/123', 'Click Me!', array());</code>
<h2>mailto()</h2>
<p>Creates a standard HTML email link. Usage example:</p>
<code>echo mailto('me@my-site.com', 'Click Here to Contact Me');</code>
<p>As with the <dfn>anchor()</dfn> tab above, you can set attributes using the third parameter.</p>
<h2>safe_mailto()</h2>
<p>Identical to the above function except it writes an obfuscated version of the mailto tag using ordinal numbers
written with JavaScript to help prevent the email address from being harvested by spam bots.</p>
<h2>auto_link()</h2>
<p>Automatically turns URLs and email addresses contained in a string into links. Example:</p>
<code>$string = auto_link($string);</code>
<p>The second parameter determines whether URLs and emails are converted or just one or the other. Default behavior is both
if the parameter is not specified. Email links are encoded as safe_mailto() as shown above.</p>
<p>Converts only URLs:</p>
<code>$string = auto_link($string, 'url');</code>
<p>Converts only Email addresses:</p>
<code>$string = auto_link($string, 'email');</code>
<p>The third parameter determines whether links are shown in a new window. The value can be TRUE or FALSE (boolean):</p>
<code>$string = auto_link($string, 'both', TRUE);</code>
<h2>url_title()</h2>
<p>Takes a string as input and creates a human-friendly URL string. This is useful if, for example, you have a blog
in which you'd like to use the title of your entries in the URL. Example:</p>
<code>$title = "What's wrong with CSS?";<br />
<br />
$url_title = url_title($title);<br />
<br />
// Produces: Whats-wrong-with-CSS
</code>
<p>The second parameter determines the word delimiter. By default dashes are used.</p>
<code>$title = "What's wrong with CSS?";<br />
<br />
$url_title = url_title($title, '_');<br />
<br />
// Produces: Whats_wrong_with_CSS
</code>
<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>
<code>$title = "What's wrong with CSS?";<br />
<br />
$url_title = url_title($title, '_', TRUE);<br />
<br />
// Produces: whats_wrong_with_css
</code>
<h3>prep_url()</h3>
<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>
<code>
$url = "example.com";<br /><br />
$url = prep_url($url);</code>
<h2>redirect()</h2>
<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
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>
<p>The optional second parameter allows you to choose between the "location"
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>
<code>if ($logged_in == FALSE)<br />
{<br />
redirect('/login/form/', 'refresh');<br />
}<br />
<br />
// with 301 redirect<br />
redirect('/article/13', 'location', 301);</code>
<p class="important"><strong>Note:</strong> In order for this function to work it must be used before anything is outputted
to the browser since it utilizes server headers.<br />
<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>
</div>
<!-- END CONTENT -->
<div id="footer">
<p>
Previous Topic: <a href="typography_helper.html">Typography Helper</a>
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·
Next Topic: <a href="xml_helper.html">XML Helper</a>
</p>
<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
</div>
</body>
</html>
|
