<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>CodeIgniter User Guide : String Helper</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"> window.onload = function() { myHeight = new fx.Height('nav', {duration: 400}); myHeight.hide(); } </script> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv='expires' content='-1' /> <meta http-equiv= 'pragma' content='no-cache' /> <meta name='robots' content='all' /> <meta name='author' content='Rick Ellis' /> <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.jpg" width="153" height="44" 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 1.5.4</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://www.codeigniter.com/">CodeIgniter Home</a> › <a href="../index.html">User Guide Home</a> › String 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>String Helper</h1> <p>The String Helper file contains functions that assist in working with strings.</p> <h2>Loading this Helper</h2> <p>This helper is loaded using the following code:</p> <code>$this->load->helper('string');</code> <p>The following functions are available:</p> <h2>random_string()</h2> <p>Generates a random string based on the type and length you specify. Useful for creating passwords or generating random hashes.</p> <p>The first parameter specifies the type of string, the second parameter specifies the length. The following choices are available:</p> <ul> <li><strong>alnum</strong>: Alpha-numeric string with lower and uppercase characters.</li> <li><strong>numeric</strong>: Numeric string.</li> <li><strong>nozero</strong>: Numeric string with no zeros.</li> <li><strong>unique</strong>: Encrypted with MD5 and uniquid(). Note: The length parameter is not available for this type. Returns a fixed length 33 character string.</li> </ul> <p>Usage example:</p> <code>echo random_string('alnum', 16);</code> <h2>alternator()</h2> <p>Allows two or more items to be alternated between, when cycling through a loop. Example:</p> <code>for ($i = 0; $i < 10; $i++)<br /> {<br /> echo alternator('string one', 'string two');<br /> }<br /> </code> <p>You can add as many parameters as you want, and with each iteration of your loop the next item will be returned.</p> <code>for ($i = 0; $i < 10; $i++)<br /> {<br /> echo alternator('one', 'two', 'three', 'four', 'five');<br /> }<br /> </code> <p><strong>Note:</strong> To use multiple separate calls to this function simply call the function with no arguments to re-initialize.</p> <h2>repeater()</h2> <p>Generates repeating copies of the data you submit. Example:</p> <code>$string = "\n";<br /> echo repeater($string, 30);</code> <p>The above would generate 30 newlines.</p> <h2>reduce_double_slashes()</h2> <p>Converts double slashes in a string to a single slash, except those found in http://. Example: </p> <code>$string = "http://www.example.com//index.php";<br /> echo reduce_double_slashes($string); // results in "http://www.example.com/index.php"</code> <h2>trim_slashes()</h2> <p>Removes any leading/trailing slashes from a string. Example:<br /> <br /> <code>$string = "/this/that/theother/";<br /> echo trim_slashes($string); // results in this/that/theother</code></p> </div> <!-- END CONTENT --> <div id="footer"> <p> Previous Topic: <a href="smiley_helper.html">Smiley Helper</a> · <a href="#top">Top of Page</a> · <a href="../index.html">User Guide Home</a> · Next Topic: <a href="text_helper.html">Text Helper</a> </p> <p><a href="http://www.codeigniter.com">CodeIgniter</a> · Copyright © 2007 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p> </div> </body> </html>