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authorKyle Farris <kylefarris@kylefarris.gotdns.org>2011-10-14 21:43:25 +0200
committerKyle Farris <kylefarris@kylefarris.gotdns.org>2011-10-14 21:43:25 +0200
commitad17f4b932b3728c1e299b48f28b3ae0dbdd6b0b (patch)
treefdb357433e76000bdef60c4d18e5ab0540b07aeb /user_guide/general/common_functions.html
parentdb46d02ac23b8e0bc2416e197494d3b795b57530 (diff)
parenta2125a5d830fd390b4cf35f77e9bb0558cfa2dd7 (diff)
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-<h1>Common Functions</h1>
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-<p>CodeIgniter uses a few functions for its operation that are globally defined, and are available to you at any point. These do not require loading any libraries or helpers.</p>
-
-<h2>is_php('<var>version_number</var>')</h2>
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-<p>is_php() determines of the PHP version being used is greater than the supplied <var>version_number</var>.</p>
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-<code>if (is_php('5.3.0'))<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;$str = quoted_printable_encode($str);<br />
-}</code>
-
-<p>Returns boolean <kbd>TRUE</kbd> if the installed version of PHP is equal to or greater than the supplied version number. Returns <kbd>FALSE</kbd> if the installed version of PHP is lower than the supplied version number.</p>
-
-
-<h2>is_really_writable('<var>path/to/file</var>')</h2>
-
-<p>is_writable() returns TRUE on Windows servers when you really can't write to the file as the OS reports to PHP as FALSE only if the read-only attribute is marked. This function determines if a file is actually writable by attempting to write to it first. Generally only recommended on platforms where this information may be unreliable.</p>
-
-<code>if (is_really_writable('file.txt'))<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;echo &quot;I could write to this if I wanted to&quot;;<br />
-}<br />
-else<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;echo &quot;File is not writable&quot;;<br />
-}</code>
-
-<h2>config_item('<var>item_key</var>')</h2>
-<p>The <a href="../libraries/config.html">Config library</a> is the preferred way of accessing configuration information, however config_item() can be used to retrieve single keys. See Config library documentation for more information.</p>
-
-<h2>show_error('<var>message</var>'), show_404('<var>page</var>'), log_message('<var>level</var>', '<samp>message</samp>')</h2>
-<p>These are each outlined on the <a href="errors.html">Error Handling</a> page.</p>
-
-<h2>set_status_header(<var>code</var>, '<var>text</var>');</h2>
-
-<p>Permits you to manually set a server status header. Example:</p>
-
-<code>set_status_header(401);<br />
-// Sets the header as: Unauthorized</code>
-
-<p><a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">See here</a> for a full list of headers.</p>
-
-
-<h2>remove_invisible_characters(<var>$str</var>)</h2>
-<p>This function prevents inserting null characters between ascii characters, like Java\0script.</p>
-
-
-<h2>html_escape(<var>$mixed</var>)</h2>
-<p>This function provides short cut for htmlspecialchars() function. It accepts string and array. To prevent Cross Site Scripting (XSS), it is very useful.</p>
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