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Derek Jones733310d2009-02-11 01:13:43 +0000[diff] [blame^]31<td><h1>CodeIgniter User Guide Version 1.7.1</h1></td>
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43<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
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45Zip Encoding Class
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58
59<h1>Zip Encoding Class</h1>
60<p>CodeIgniter's Zip Encoding Class classes permit you to create Zip archives. Archives can be downloaded to your
61desktop or saved to a directory.</p>
62
63
64<h2>Initializing the Class</h2>
65<p>Like most other classes in CodeIgniter, the Zip class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
66
67<code>$this->load->library('zip');</code>
68<p>Once loaded, the Zip library object will be available using: <dfn>$this->zip</dfn></p>
69
70
71<h2>Usage Example</h2>
72
73<p>This example demonstrates how to compress a file, save it to a folder on your server, and download it to your desktop.</p>
74
75<code>
76$name = 'mydata1.txt';<br />
77$data = 'A Data String!';<br />
78<br />
79$this->zip->add_data($name, $data);<br />
80<br />
81// Write the zip file to a folder on your server. Name it "my_backup.zip"<br />
82$this->zip->archive('/path/to/directory/my_backup.zip');
83<br /><br />
84 // Download the file to your desktop. Name it "my_backup.zip"<br />
85$this->zip->download('my_backup.zip');
86</code>
87
88<h1>Function Reference</h1>
89
90<h2>$this->zip->add_data()</h2>
91
92<p>Permits you to add data to the Zip archive. The first parameter must contain the name you would like
93given to the file, the second parameter must contain the file data as a string:</p>
94
95<code>
96$name = 'my_bio.txt';<br />
97$data = 'I was born in an elevator...';<br />
98<br />
99$this->zip->add_data($name, $data);
100</code>
101
102<p>You are allowed multiple calls to this function in order to
103add several files to your archive. Example:</p>
104
105<code>
106$name = 'mydata1.txt';<br />
107$data = 'A Data String!';<br />
108$this->zip->add_data($name, $data);<br />
109<br />
110$name = 'mydata2.txt';<br />
111$data = 'Another Data String!';<br />
112$this->zip->add_data($name, $data);<br />
113</code>
114
115<p>Or you can pass multiple files using an array:</p>
116
117<code>
118$data = array(<br />
119&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'mydata1.txt' => 'A Data String!',<br />
120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'mydata2.txt' => 'Another Data String!'<br />
121&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
122<br />
123$this->zip->add_data($data);<br />
124<br />
125$this->zip->download('my_backup.zip');
126</code>
127
128<p>If you would like your compressed data organized into sub-folders, include the path as part of the filename:</p>
129
130<code>
131$name = '<kbd>personal/</kbd>my_bio.txt';<br />
132$data = 'I was born in an elevator...';<br />
133<br />
134$this->zip->add_data($name, $data);
135</code>
136
137<p>The above example will place <dfn>my_bio.txt</dfn> inside a folder called <kbd>personal</kbd>.</p>
138
139
140<h2>$this->zip->add_dir()</h2>
141
142<p>Permits you to add a directory. Usually this function is unnecessary since you can place your data into folders when
143using <dfn>$this->zip->add_data()</dfn>, but if you would like to create an empty folder you can do so. Example:</p>
144
145<code>$this->zip->add_dir('myfolder'); // Creates a folder called "myfolder"</code>
146
147
148
149<h2>$this->zip->read_file()</h2>
150
151<p>Permits you to compress a file that already exists somewhere on your server. Supply a file path and the zip class will
152read it and add it to the archive:</p>
153
154<code>
155$path = '/path/to/photo.jpg';<br /><br />
156$this->zip->read_file($path);
157<br /><br />
158 // Download the file to your desktop. Name it "my_backup.zip"<br />
159$this->zip->download('my_backup.zip');
160</code>
161
162<p>If you would like the Zip archive to maintain the directory structure of the file in it, pass <kbd>TRUE</kbd> (boolean) in the
163second parameter. Example:</p>
164
165
166<code>
167$path = '/path/to/photo.jpg';<br /><br />
168$this->zip->read_file($path, <kbd>TRUE</kbd>);
169<br /><br />
170 // Download the file to your desktop. Name it "my_backup.zip"<br />
171$this->zip->download('my_backup.zip');
172</code>
173
174<p>In the above example, <dfn>photo.jpg</dfn> will be placed inside two folders: <kbd>path/to/</kbd></p>
175
176
177
178<h2>$this->zip->read_dir()</h2>
179
180<p>Permits you to compress a folder (and its contents) that already exists somewhere on your server. Supply a file path to the
181directory and the zip class will recursively read it and recreate it as a Zip archive. All files contained within the
182supplied path will be encoded, as will any sub-folders contained within it. Example:</p>
183
184<code>
185$path = '/path/to/your/directory/';<br /><br />
186$this->zip->read_dir($path);
187<br /><br />
188 // Download the file to your desktop. Name it "my_backup.zip"<br />
189$this->zip->download('my_backup.zip');
190</code>
191
192
193
194
195<h2>$this->zip->archive()</h2>
196
197<p>Writes the Zip-encoded file to a directory on your server. Submit a valid server path ending in the file name. Make sure the
198directory is writable (666 or 777 is usually OK). Example:</p>
199
200<code>$this->zip->archive('/path/to/folder/myarchive.zip'); // Creates a file named myarchive.zip</code>
201
202
203<h2>$this->zip->download()</h2>
204
205<p>Causes the Zip file to be downloaded from your server. The function must be passed the name you would like the zip file called.
206Example:</p>
207
208<code>$this->zip->download('latest_stuff.zip'); // File will be named "latest_stuff.zip"</code>
209
210<p class="important"><strong>Note:</strong>&nbsp; Do not display any data in the controller in which you call this function since it sends various server headers
211that cause the download to happen and the file to be treated as binary.</p>
212
213
214<h2>$this->zip->get_zip()</h2>
215
216<p>Returns the Zip-compressed file data. Generally you will not need this function unless you want to do something unique with the data.
217Example:</p>
218
219<code>
220$name = 'my_bio.txt';<br />
221$data = 'I was born in an elevator...';<br />
222<br />
223$this->zip->add_data($name, $data);<br /><br />
224
225$zip_file = $this->zip->get_zip();
226</code>
227
228
229<h2>$this->zip->clear_data()</h2>
230
231<p>The Zip class caches your zip data so that it doesn't need to recompile the Zip archive for each function you use above.
232If, however, you need to create multiple Zips, each with different data, you can clear the cache between calls. Example:</p>
233
234<code>
235$name = 'my_bio.txt';<br />
236$data = 'I was born in an elevator...';<br />
237<br />
238$this->zip->add_data($name, $data);<br />
239$zip_file = $this->zip->get_zip();<br />
240<br />
241<kbd>$this->zip->clear_data();</kbd>
242<br /><br />
243
244$name = 'photo.jpg';<br />
245$this->zip->read_file("/path/to/photo.jpg"); // Read the file's contents<br />
246<br /><br />
247$this->zip->download('myphotos.zip');
248</code>
249
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