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Derek Jones8917af72010-03-05 12:41:45 -0600[diff] [blame]31<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]32<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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59<h1>String Helper</h1>
60
61<p>The String Helper file contains functions that assist in working with strings.</p>
62
63
64<h2>Loading this Helper</h2>
65
66<p>This helper is loaded using the following code:</p>
67<code>$this->load->helper('string');</code>
68
69<p>The following functions are available:</p>
70
71<h2>random_string()</h2>
72
73<p>Generates a random string based on the type and length you specify. Useful for creating passwords or generating random hashes.</p>
74
75<p>The first parameter specifies the type of string, the second parameter specifies the length. The following choices are available:</p>
76
Derek Allard472dd212010-01-23 20:03:27 +0000[diff] [blame]77 alpha, alunum, numeric, nozero, unique, md5, encrypt and sha1
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]78<ul>
Derek Allard472dd212010-01-23 20:03:27 +0000[diff] [blame]79 <li><strong>alpha</strong>:&nbsp; A string with lower and uppercase letters only.</li>
80 <li><strong>alnum</strong>:&nbsp; Alpha-numeric string with lower and uppercase characters.</li>
81 <li><strong>numeric</strong>:&nbsp; Numeric string.</li>
82 <li><strong>nozero</strong>:&nbsp; Numeric string with no zeros.</li>
83 <li><strong>unique</strong>:&nbsp; Encrypted with MD5 and uniqid(). Note: The length parameter is not available for this type.
84 Returns a fixed length 32 character string.</li>
85 <li><strong>sha1</strong>:&nbsp; An encrypted random number based on <kbd>do_hash()</kbd> from the <a href="security_helper.html">security helper</a>.</li>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]86</ul>
87
88<p>Usage example:</p>
89
90<code>echo random_string('alnum', 16);</code>
91
92
93<h2>alternator()</h2>
94
95<p>Allows two or more items to be alternated between, when cycling through a loop. Example:</p>
96
97<code>for ($i = 0; $i < 10; $i++)<br />
98{<br />
99&nbsp;&nbsp;&nbsp;&nbsp;echo alternator('string one', 'string two');<br />
100}<br />
101</code>
102
103<p>You can add as many parameters as you want, and with each iteration of your loop the next item will be returned.</p>
104
105<code>for ($i = 0; $i < 10; $i++)<br />
106{<br />
107&nbsp;&nbsp;&nbsp;&nbsp;echo alternator('one', 'two', 'three', 'four', 'five');<br />
108}<br />
109</code>
110
111<p><strong>Note:</strong> To use multiple separate calls to this function simply call the function with no arguments to re-initialize.</p>
112
113
114
115<h2>repeater()</h2>
116<p>Generates repeating copies of the data you submit. Example:</p>
117<code>$string = "\n";<br />
118echo repeater($string, 30);</code>
119
120<p>The above would generate 30 newlines.</p>
121<h2>reduce_double_slashes()</h2>
122<p>Converts double slashes in a string to a single slash, except those found in http://. Example: </p>
123<code>$string = &quot;http://example.com//index.php&quot;;<br />
124echo reduce_double_slashes($string); // results in &quot;http://example.com/index.php&quot;</code>
125<h2>trim_slashes()</h2>
126<p>Removes any leading/trailing slashes from a string. Example:<br />
127 <br />
128 <code>$string = &quot;/this/that/theother/&quot;;<br />
129echo trim_slashes($string); // results in this/that/theother</code></p>
130
131
132<h2>reduce_multiples()</h2>
133<p>Reduces multiple instances of a particular character occuring directly after each other. Example:</p>
134<code>
135$string="Fred, Bill,, Joe, Jimmy";<br />
136$string=reduce_multiples($string,","); //results in "Fred, Bill, Joe, Jimmy"
137</code>
138<p>The function accepts the following parameters:
139<code>reduce_multiples(string: text to search in, string: character to reduce, boolean: whether to remove the character from the front and end of the string)</code>
140
141The first parameter contains the string in which you want to reduce the multiplies. The second parameter contains the character you want to have reduced.
142The third parameter is FALSE by default; if set to TRUE it will remove occurences of the character at the beginning and the end of the string. Example:
143
144<code>
145$string=",Fred, Bill,, Joe, Jimmy,";<br />
146$string=reduce_multiples($string, ", ", TRUE); //results in "Fred, Bill, Joe, Jimmy"
147</code>
Barry Mienydd671972010-10-04 16:33:58 +0200[diff] [blame]148</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]149
150<h2>quotes_to_entities()</h2>
151<p>Converts single and double quotes in a string to the corresponding HTML entities. Example:</p>
152<code>$string="Joe's \"dinner\"";<br />
153$string=quotes_to_entities($string); //results in "Joe&amp;#39;s &amp;quot;dinner&amp;quot;"
154</code>
155
156<h2>strip_quotes()</h2>
157<p>Removes single and double quotes from a string. Example:</p>
158<code>$string="Joe's \"dinner\"";<br />
159$string=strip_quotes($string); //results in "Joes dinner"
160</code>
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