179 行
无行尾
7.8 KiB
HTML
179 行
无行尾
7.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>File Helper : CodeIgniter User Guide</title>
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<meta name='description' content='CodeIgniter User Guide' />
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<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>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.0.1</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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File Helper
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</td>
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<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>
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<!-- START CONTENT -->
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<div id="content">
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<h1>File Helper</h1>
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<p>The File Helper file contains functions that assist in working with files.</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>$this->load->helper('file');</code>
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<p>The following functions are available:</p>
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<h2>read_file('<var>path</var>')</h2>
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<p>Returns the data contained in the file specified in the path. Example:</p>
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<code>$string = read_file('./path/to/file.php');</code>
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<p>The path can be a relative or full server path. Returns FALSE (boolean) on failure.</p>
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<p class="important"><strong>Note:</strong> The path is relative to your main site index.php file, NOT your controller or view files.
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CodeIgniter uses a front controller so paths are always relative to the main site index.</p>
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<p>If your server is running an open_basedir restriction this function
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might not work if you are trying to access a file above the calling script.</p>
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<h2>write_file('<var>path</var>', <kbd>$data</kbd>)</h2>
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<p>Writes data to the file specified in the path. If the file does not exist the function will create it. Example:</p>
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<code>
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$data = 'Some file data';<br />
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<br />
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if ( ! write_file('./path/to/file.php', $data))<br />
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{<br />
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echo 'Unable to write the file';<br />
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}<br />
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else<br />
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{<br />
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echo 'File written!';<br />
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}</code>
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<p>You can optionally set the write mode via the third parameter:</p>
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<code>write_file('./path/to/file.php', $data, <var>'r+'</var>);</code>
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<p>The default mode is <kbd>wb</kbd>. Please see the <a href="http://php.net/fopen">PHP user guide</a> for mode options.</p>
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<p>Note: In order for this function to write data to a file its file permissions must be set such that it is writable (666, 777, etc.).
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If the file does not already exist, the directory containing it must be writable.</p>
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<p class="important"><strong>Note:</strong> The path is relative to your main site index.php file, NOT your controller or view files.
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CodeIgniter uses a front controller so paths are always relative to the main site index.</p>
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<h2>delete_files('<var>path</var>')</h2>
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<p>Deletes ALL files contained in the supplied path. Example:</p>
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<code>delete_files('./path/to/directory/');</code>
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<p>If the second parameter is set to <kbd>true</kbd>, any directories contained within the supplied root path will be deleted as well. Example:</p>
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<code>delete_files('./path/to/directory/', TRUE);</code>
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<p class="important"><strong>Note:</strong> The files must be writable or owned by the system in order to be deleted.</p>
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<h2>get_filenames('<var>path/to/directory/</var>')</h2>
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<p>Takes a server path as input and returns an array containing the names of all files contained within it. The file path
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can optionally be added to the file names by setting the second parameter to TRUE.</p>
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<h2>get_dir_file_info('<var>path/to/directory/</var>', <kbd>$top_level_only</kbd> = TRUE)</h2>
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<p>Reads the specified directory and builds an array containing the filenames, filesize, dates, and permissions. Sub-folders contained within the specified path are only read if forced
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by sending the second parameter, <kbd>$top_level_only</kbd> to <samp>FALSE</samp>, as this can be an intensive operation.</p>
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<h2>get_file_info('<var>path/to/file</var>', <kbd>$file_information</kbd>)</h2>
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<p>Given a file and path, returns the name, path, size, date modified. Second parameter allows you to explicitly declare what information you want returned; options are: name, server_path, size, date, readable, writable, executable, fileperms. Returns FALSE if the file cannot be found.</p>
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<p class="important"><strong>Note:</strong> The "writable" uses the PHP function is_writable() which is known to have issues on the IIS webserver. Consider using fileperms instead, which returns information from PHP's fileperms() function.</p>
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<h2>get_mime_by_extension('<var>file</var>')</h2>
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<p>Translates a file extension into a mime type based on config/mimes.php. Returns FALSE if it can't determine the type, or open the mime config file.</p>
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<p>
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<code>$file = "somefile.png";<br />
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echo $file . ' is has a mime type of ' . get_mime_by_extension($file);</code>
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</p>
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<p class="critical"><strong>Note:</strong> This is not an accurate way of determining file mime types, and is here strictly as a convenience. It should not be used for security.</p>
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<h2>symbolic_permissions(<kbd>$perms</kbd>)</h2>
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<p>Takes numeric permissions (such as is returned by <kbd>fileperms()</kbd> and returns standard symbolic notation of file permissions.</p>
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<code>echo symbolic_permissions(fileperms('./index.php'));<br />
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<br />
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// -rw-r--r--</code>
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<h2>octal_permissions(<kbd>$perms</kbd>)</h2>
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<p>Takes numeric permissions (such as is returned by <kbd>fileperms()</kbd> and returns a three character octal notation of file permissions.</p>
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<code>echo octal_permissions(fileperms('./index.php'));<br />
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<br />
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// 644</code>
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</div>
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<!-- END CONTENT -->
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<p>
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Previous Topic: <a href="email_helper.html">Email Helper</a>
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="form_helper.html">Form Helper</a></p>
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