summaryrefslogtreecommitdiffstats
path: root/user_guide/helpers/string_helper.html
blob: c5be715a9da6907db8e1f471a330315e2432b543 (plain)
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
<!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</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 1.5.3</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> &nbsp;&#8250;&nbsp;
<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
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&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<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>:&nbsp; Alpha-numeric string with lower and uppercase characters.</li>
<li><strong>numeric</strong>:&nbsp; Numeric string.</li>
<li><strong>nozero</strong>:&nbsp; Numeric string with no zeros.</li>
<li><strong>unique</strong>:&nbsp; 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:

<code>for ($i = 0; $i < 10; $i++)<br />
{<br />
&nbsp;&nbsp;&nbsp;&nbsp;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 />
&nbsp;&nbsp;&nbsp;&nbsp;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>




</div>
<!-- END CONTENT -->


<div id="footer">
<p>
Previous Topic:&nbsp;&nbsp;<a href="smiley_helper.html">Smiley Helper</a>
&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
<a href="#top">Top of Page</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
<a href="../index.html">User Guide Home</a>&nbsp;&nbsp;&nbsp;&middot;&nbsp;&nbsp;
Next Topic:&nbsp;&nbsp;<a href="text_helper.html">Text Helper</a>
<p>
<p><a href="http://www.codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2007 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">Ellislab, Inc.</a></p>
</div>

</body>
</html>