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45String Helper
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57
58
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>$this->load->helper('string');</code>
68
69<p>The following functions are available:</p>
70
71<h2>random_string()</h2>
72
73<p>Generates a random string based on the type and length you specify. Useful for creating passwords or generating random hashes.</p>
74
75<p>The first parameter specifies the type of string, the second parameter specifies the length. The following choices are available:</p>
76
77
78<ul>
79<li><strong>alnum</strong>:&nbsp; Alpha-numeric string with lower and uppercase characters.</li>
80<li><strong>numeric</strong>:&nbsp; Numeric string.</li>
81<li><strong>nozero</strong>:&nbsp; Numeric string with no zeros.</li>
82<li><strong>unique</strong>:&nbsp; Encrypted with MD5 and uniqid(). Note: The length parameter is not available for this type.
Derek Allardaf6a8be2008-01-21 15:24:06 +0000[diff] [blame]83Returns a fixed length 32 character string.</li>
Derek Allard39b622d2008-01-16 21:10:09 +0000[diff] [blame]84</ul>
85
86<p>Usage example:</p>
87
88<code>echo random_string('alnum', 16);</code>
89
90
91<h2>alternator()</h2>
92
93<p>Allows two or more items to be alternated between, when cycling through a loop. Example:</p>
94
95<code>for ($i = 0; $i < 10; $i++)<br />
96{<br />
97&nbsp;&nbsp;&nbsp;&nbsp;echo alternator('string one', 'string two');<br />
98}<br />
99</code>
100
101<p>You can add as many parameters as you want, and with each iteration of your loop the next item will be returned.</p>
102
103<code>for ($i = 0; $i < 10; $i++)<br />
104{<br />
105&nbsp;&nbsp;&nbsp;&nbsp;echo alternator('one', 'two', 'three', 'four', 'five');<br />
106}<br />
107</code>
108
109<p><strong>Note:</strong> To use multiple separate calls to this function simply call the function with no arguments to re-initialize.</p>
110
111
112
113<h2>repeater()</h2>
114<p>Generates repeating copies of the data you submit. Example:</p>
115<code>$string = "\n";<br />
116echo repeater($string, 30);</code>
117
118<p>The above would generate 30 newlines.</p>
119<h2>reduce_double_slashes()</h2>
120<p>Converts double slashes in a string to a single slash, except those found in http://. Example: </p>
121<code>$string = &quot;http://www.example.com//index.php&quot;;<br />
122echo reduce_double_slashes($string); // results in &quot;http://www.example.com/index.php&quot;</code>
123<h2>trim_slashes()</h2>
124<p>Removes any leading/trailing slashes from a string. Example:<br />
125 <br />
126 <code>$string = &quot;/this/that/theother/&quot;;<br />
127echo trim_slashes($string); // results in this/that/theother</code></p>
128
129
130<h2>reduce_multiples()</h2>
131<p>Reduces multiple instances of a particular character occuring directly after each other. Example:</p>
132<code>
133$string="Fred, Bill,, Joe, Jimmy";<br />
134$string=reduce_multiples($string,","); //results in "Fred, Bill, Joe, Jimmy"
135</code>
136<p>The function accepts the following parameters:
137<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>
138
Derek Allard140786f2008-04-01 16:06:08 +0000[diff] [blame]139The first parameter contains the string in which you want to reduce the multiplies. The second parameter contains the character you want to have reduced.
140The 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:
Derek Allard39b622d2008-01-16 21:10:09 +0000[diff] [blame]141
142<code>
143$string=",Fred, Bill,, Joe, Jimmy,";<br />
Derek Allard140786f2008-04-01 16:06:08 +0000[diff] [blame]144$string=reduce_multiples($string, ", ", TRUE); //results in "Fred, Bill, Joe, Jimmy"
Derek Allard39b622d2008-01-16 21:10:09 +0000[diff] [blame]145</code>
146</p>
147
148<h2>quotes_to_entities()</h2>
149<p>Converts single and double quotes in a string to the corresponding HTML entities. Example:</p>
150<code>$string="Joe's \"dinner\"";<br />
151$string=quotes_to_entities($string); //results in "Joe&amp;#39;s &amp;quot;dinner&amp;quot;"
152</code>
153
154<h2>strip_quotes()</h2>
155<p>Removes single and double quotes from a string. Example:</p>
156<code>$string="Joe's \"dinner\"";<br />
157$string=strip_quotes($string); //results in "Joes dinner"
158</code>
159
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