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<div class="section" id="string-helper">
<h1>String Helper<a class="headerlink" href="#string-helper" title="Permalink to this headline"></a></h1>
<p>The String Helper file contains functions that assist in working with
strings.</p>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">Please note that these functions are NOT intended, nor
suitable to be used for any kind of security-related logic.</p>
</div>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li>
<li><a class="reference internal" href="#available-functions" id="id2">Available Functions</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="loading-this-helper">
<h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline"></a></h2>
<p>This helper is loaded using the following code:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;string&#39;</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="available-functions">
<h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline"></a></h2>
<p>The following functions are available:</p>
<dl class="function">
<dt id="random_string">
<code class="descname">random_string</code><span class="sig-paren">(</span><span class="optional">[</span><em>$type = 'alnum'</em><span class="optional">[</span>, <em>$len = 8</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#random_string" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$type</strong> (<em>string</em>) – Randomization type</li>
<li><strong>$len</strong> (<em>int</em>) – Output string length</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A random string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<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 class="simple">
<li><strong>alpha</strong>: A string with lower and uppercase letters only.</li>
<li><strong>alnum</strong>: Alpha-numeric string with lower and uppercase characters.</li>
<li><strong>basic</strong>: A random number based on <code class="docutils literal"><span class="pre">mt_rand()</span></code>.</li>
<li><strong>numeric</strong>: Numeric string.</li>
<li><strong>nozero</strong>: Numeric string with no zeros.</li>
<li><strong>md5</strong>: An encrypted random number based on <code class="docutils literal"><span class="pre">md5()</span></code> (fixed length of 32).</li>
<li><strong>sha1</strong>: An encrypted random number based on <code class="docutils literal"><span class="pre">sha1()</span></code> (fixed length of 40).</li>
</ul>
<p>Usage example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">random_string</span><span class="p">(</span><span class="s1">&#39;alnum&#39;</span><span class="p">,</span> <span class="mi">16</span><span class="p">);</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Usage of the <em>unique</em> and <em>encrypt</em> types is DEPRECATED. They
are just aliases for <em>md5</em> and <em>sha1</em> respectively.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="increment_string">
<code class="descname">increment_string</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$separator = '_'</em><span class="optional">[</span>, <em>$first = 1</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#increment_string" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$separator</strong> (<em>string</em>) – Separator to append a duplicate number with</li>
<li><strong>$first</strong> (<em>int</em>) – Starting number</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An incremented string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Increments a string by appending a number to it or increasing the
number. Useful for creating “copies” or a file or duplicating database
content which has unique titles or slugs.</p>
<p>Usage example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nx">increment_string</span><span class="p">(</span><span class="s1">&#39;file&#39;</span><span class="p">,</span> <span class="s1">&#39;_&#39;</span><span class="p">);</span> <span class="c1">// &quot;file_1&quot;</span>
<span class="k">echo</span> <span class="nx">increment_string</span><span class="p">(</span><span class="s1">&#39;file&#39;</span><span class="p">,</span> <span class="s1">&#39;-&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span> <span class="c1">// &quot;file-2&quot;</span>
<span class="k">echo</span> <span class="nx">increment_string</span><span class="p">(</span><span class="s1">&#39;file_4&#39;</span><span class="p">);</span> <span class="c1">// &quot;file_5&quot;</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="alternator">
<code class="descname">alternator</code><span class="sig-paren">(</span><em>$args</em><span class="sig-paren">)</span><a class="headerlink" href="#alternator" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$args</strong> (<em>mixed</em>) – A variable number of arguments</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Alternated string(s)</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Allows two or more items to be alternated between, when cycling through
a loop. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">for</span> <span class="p">(</span><span class="nv">$i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nv">$i</span> <span class="o">&lt;</span> <span class="mi">10</span><span class="p">;</span> <span class="nv">$i</span><span class="o">++</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="nx">alternator</span><span class="p">(</span><span class="s1">&#39;string one&#39;</span><span class="p">,</span> <span class="s1">&#39;string two&#39;</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>You can add as many parameters as you want, and with each iteration of
your loop the next item will be returned.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">for</span> <span class="p">(</span><span class="nv">$i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nv">$i</span> <span class="o">&lt;</span> <span class="mi">10</span><span class="p">;</span> <span class="nv">$i</span><span class="o">++</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="nx">alternator</span><span class="p">(</span><span class="s1">&#39;one&#39;</span><span class="p">,</span> <span class="s1">&#39;two&#39;</span><span class="p">,</span> <span class="s1">&#39;three&#39;</span><span class="p">,</span> <span class="s1">&#39;four&#39;</span><span class="p">,</span> <span class="s1">&#39;five&#39;</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">To use multiple separate calls to this function simply call the
function with no arguments to re-initialize.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="repeater">
<code class="descname">repeater</code><span class="sig-paren">(</span><em>$data</em><span class="optional">[</span>, <em>$num = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#repeater" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$data</strong> (<em>string</em>) – Input</li>
<li><strong>$num</strong> (<em>int</em>) – Number of times to repeat</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Repeated string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Generates repeating copies of the data you submit. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">repeater</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="mi">30</span><span class="p">);</span>
</pre></div>
</div>
<p>The above would generate 30 newlines.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function is DEPRECATED. Use the native <code class="docutils literal"><span class="pre">str_repeat()</span></code>
instead.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="reduce_double_slashes">
<code class="descname">reduce_double_slashes</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#reduce_double_slashes" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A string with normalized slashes</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Converts double slashes in a string to a single slash, except those
found in URL protocol prefixes (e.g. http://).</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;http://example.com//index.php&quot;</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">reduce_double_slashes</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> <span class="c1">// results in &quot;http://example.com/index.php&quot;</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="strip_slashes">
<code class="descname">strip_slashes</code><span class="sig-paren">(</span><em>$data</em><span class="sig-paren">)</span><a class="headerlink" href="#strip_slashes" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$data</strong> (<em>mixed</em>) – Input string or an array of strings</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">String(s) with stripped slashes</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Removes any slashes from an array of strings.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">&#39;question&#39;</span><span class="nx">  </span><span class="o">=&gt;</span> <span class="s1">&#39;Is your name O\&#39;reilly?&#39;</span><span class="p">,</span>
<span class="s1">&#39;answer&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;No, my name is O\&#39;connor.&#39;</span>
<span class="p">);</span>
<span class="nv">$str</span> <span class="o">=</span> <span class="nx">strip_slashes</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span>
</pre></div>
</div>
<p>The above will return the following array:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">array</span><span class="p">(</span>
<span class="s1">&#39;question&#39;</span><span class="nx">  </span><span class="o">=&gt;</span> <span class="s2">&quot;Is your name O&#39;reilly?&quot;</span><span class="p">,</span>
<span class="s1">&#39;answer&#39;</span> <span class="o">=&gt;</span> <span class="s2">&quot;No, my name is O&#39;connor.&quot;</span>
<span class="p">);</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">For historical reasons, this function will also accept
and handle string inputs. This however makes it just an
alias for <code class="docutils literal"><span class="pre">stripslashes()</span></code>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="trim_slashes">
<code class="descname">trim_slashes</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#trim_slashes" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Slash-trimmed string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Removes any leading/trailing slashes from a string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;/this/that/theother/&quot;</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">trim_slashes</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> <span class="c1">// results in this/that/theother</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function is DEPRECATED. Use the native <code class="docutils literal"><span class="pre">trim()</span></code> instead:
|
| trim($str, ‘/’);</p>
</div>
</dd></dl>
<dl class="function">
<dt id="reduce_multiples">
<code class="descname">reduce_multiples</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$character = ''</em><span class="optional">[</span>, <em>$trim = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#reduce_multiples" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Text to search in</li>
<li><strong>$character</strong> (<em>string</em>) – Character to reduce</li>
<li><strong>$trim</strong> (<em>bool</em>) – Whether to also trim the specified character</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Reduced string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Reduces multiple instances of a particular character occurring directly
after each other. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;Fred, Bill,, Joe, Jimmy&quot;</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">reduce_multiples</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span><span class="s2">&quot;,&quot;</span><span class="p">);</span> <span class="c1">//results in &quot;Fred, Bill, Joe, Jimmy&quot;</span>
</pre></div>
</div>
<p>If the third parameter is set to TRUE it will remove occurrences of the
character at the beginning and the end of the string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;,Fred, Bill,, Joe, Jimmy,&quot;</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">reduce_multiples</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="s2">&quot;, &quot;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span> <span class="c1">//results in &quot;Fred, Bill, Joe, Jimmy&quot;</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="quotes_to_entities">
<code class="descname">quotes_to_entities</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#quotes_to_entities" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">String with quotes converted to HTML entities</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Converts single and double quotes in a string to the corresponding HTML
entities. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;Joe&#39;s </span><span class="se">\&quot;</span><span class="s2">dinner</span><span class="se">\&quot;</span><span class="s2">&quot;</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">quotes_to_entities</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> <span class="c1">//results in &quot;Joe&amp;#39;s &amp;quot;dinner&amp;quot;&quot;</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="strip_quotes">
<code class="descname">strip_quotes</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#strip_quotes" title="Permalink to this definition"></a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">String with quotes stripped</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Removes single and double quotes from a string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="s2">&quot;Joe&#39;s </span><span class="se">\&quot;</span><span class="s2">dinner</span><span class="se">\&quot;</span><span class="s2">&quot;</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">strip_quotes</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> <span class="c1">//results in &quot;Joes dinner&quot;</span>
</pre></div>
</div>
</dd></dl>
</div>
</div>
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