Файл: CodeIgniter-3.0.3/user_guide/helpers/text_helper.html
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<div class="section" id="text-helper">
<h1>Text Helper<a class="headerlink" href="#text-helper" title="Permalink to this headline">¶</a></h1>
<p>The Text Helper file contains functions that assist in working with
text.</p>
<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 class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'text'</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="available-functions">
<h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2>
<p>The following functions are available:</p>
<dl class="function">
<dt id="word_limiter">
<tt class="descname">word_limiter</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$limit = 100</em><span class="optional">[</span>, <em>$end_char = '&#8230;'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#word_limiter" 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>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$limit</strong> (<em>int</em>) – Limit</li>
<li><strong>$end_char</strong> (<em>string</em>) – End character (usually an ellipsis)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Word-limited string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Truncates a string to the number of <em>words</em> specified. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="s2">"Here is a nice text string consisting of eleven words."</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">word_limiter</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="mi">4</span><span class="p">);</span>
<span class="c1">// Returns: Here is a nice</span>
</pre></div>
</div>
<p>The third parameter is an optional suffix added to the string. By
default it adds an ellipsis.</p>
</dd></dl>
<dl class="function">
<dt id="character_limiter">
<tt class="descname">character_limiter</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$n = 500</em><span class="optional">[</span>, <em>$end_char = '&#8230;'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#character_limiter" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$n</strong> (<em>int</em>) – Number of characters</li>
<li><strong>$end_char</strong> (<em>string</em>) – End character (usually an ellipsis)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Character-limited 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>Truncates a string to the number of <em>characters</em> specified. It
maintains the integrity of words so the character count may be slightly
more or less than what you specify.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="s2">"Here is a nice text string consisting of eleven words."</span><span class="p">;</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">character_limiter</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="mi">20</span><span class="p">);</span>
<span class="c1">// Returns: Here is a nice text string</span>
</pre></div>
</div>
<p>The third parameter is an optional suffix added to the string, if
undeclared this helper uses an ellipsis.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you need to truncate to an exact number of characters please
see the <a class="reference internal" href="#ellipsize" title="ellipsize"><tt class="xref php php-func docutils literal"><span class="pre">ellipsize()</span></tt></a> function below.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="ascii_to_entities">
<tt class="descname">ascii_to_entities</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#ascii_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>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A string with ASCII values converted to entities</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Converts ASCII values to character entities, including high ASCII and MS
Word characters that can cause problems when used in a web page, so that
they can be shown consistently regardless of browser settings or stored
reliably in a database. There is some dependence on your server’s
supported character sets, so it may not be 100% reliable in all cases,
but for the most part it should correctly identify characters outside
the normal range (like accented characters).</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="nx">ascii_to_entities</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="convert_accented_characters">
<tt class="descname">convert_accented_characters</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#convert_accented_characters" 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>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A string with accented characters converted</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Transliterates high ASCII characters to low ASCII equivalents. Useful
when non-English characters need to be used where only standard ASCII
characters are safely used, for instance, in URLs.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="nx">convert_accented_characters</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function uses a companion config file
<cite>application/config/foreign_chars.php</cite> to define the to and
from array for transliteration.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="word_censor">
<tt class="descname">word_censor</tt><big>(</big><em>$str</em>, <em>$censored</em><span class="optional">[</span>, <em>$replacement = ''</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#word_censor" 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>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$censored</strong> (<em>array</em>) – List of bad words to censor</li>
<li><strong>$replacement</strong> (<em>string</em>) – What to replace bad words with</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Censored string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Enables you to censor words within a text string. The first parameter
will contain the original string. The second will contain an array of
words which you disallow. The third (optional) parameter can contain
a replacement value for the words. If not specified they are replaced
with pound signs: ####.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$disallowed</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'darn'</span><span class="p">,</span> <span class="s1">'shucks'</span><span class="p">,</span> <span class="s1">'golly'</span><span class="p">,</span> <span class="s1">'phooey'</span><span class="p">);</span>
<span class="nv">$string</span> <span class="o">=</span> <span class="nx">word_censor</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="nv">$disallowed</span><span class="p">,</span> <span class="s1">'Beep!'</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="highlight_code">
<tt class="descname">highlight_code</tt><big>(</big><em>$str</em><big>)</big><a class="headerlink" href="#highlight_code" 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>$str</strong> (<em>string</em>) – Input string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">String with code highlighted via HTML</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Colorizes a string of code (PHP, HTML, etc.). Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="nx">highlight_code</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
</pre></div>
</div>
<p>The function uses PHP’s <tt class="docutils literal"><span class="pre">highlight_string()</span></tt> function, so the
colors used are the ones specified in your php.ini file.</p>
</dd></dl>
<dl class="function">
<dt id="highlight_phrase">
<tt class="descname">highlight_phrase</tt><big>(</big><em>$str</em>, <em>$phrase</em><span class="optional">[</span>, <em>$tag_open = '<mark>'</em><span class="optional">[</span>, <em>$tag_close = '</mark>'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#highlight_phrase" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$phrase</strong> (<em>string</em>) – Phrase to highlight</li>
<li><strong>$tag_open</strong> (<em>string</em>) – Opening tag used for the highlight</li>
<li><strong>$tag_close</strong> (<em>string</em>) – Closing tag for the highlight</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">String with a phrase highlighted via HTML</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Will highlight a phrase within a text string. The first parameter will
contain the original string, the second will contain the phrase you wish
to highlight. The third and fourth parameters will contain the
opening/closing HTML tags you would like the phrase wrapped in.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="s2">"Here is a nice text string about nothing in particular."</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">highlight_phrase</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="s2">"nice text"</span><span class="p">,</span> <span class="s1">'<span style="color:#990000;">'</span><span class="p">,</span> <span class="s1">'</span>'</span><span class="p">);</span>
</pre></div>
</div>
<p>The above code prints:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">Here</span> <span class="nx">is</span> <span class="nx">a</span> <span class="o"><</span><span class="nx">span</span> <span class="nx">style</span><span class="o">=</span><span class="s2">"color:#990000;"</span><span class="o">></span><span class="nx">nice</span> <span class="nx">text</span><span class="o"></</span><span class="nx">span</span><span class="o">></span> <span class="nx">string</span> <span class="nx">about</span> <span class="nx">nothing</span> <span class="nx">in</span> <span class="nx">particular</span><span class="o">.</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>This function used to use the <tt class="docutils literal"><span class="pre"><strong></span></tt> tag by default. Older browsers
might not support the new HTML5 mark tag, so it is recommended that you
insert the following CSS code into your stylesheet if you need to support
such browsers:</p>
<div class="last highlight-ci"><div class="highlight"><pre><span class="nx">mark</span> <span class="p">{</span>
<span class="nx">background</span><span class="o">:</span> <span class="c1">#ff0;</span>
<span class="nx">color</span><span class="o">:</span> <span class="c1">#000;</span>
<span class="p">};</span>
</pre></div>
</div>
</div>
</dd></dl>
<dl class="function">
<dt id="word_wrap">
<tt class="descname">word_wrap</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$charlim = 76</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#word_wrap" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$charlim</strong> (<em>int</em>) – Character limit</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Word-wrapped string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Wraps text at the specified <em>character</em> count while maintaining
complete words.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$string</span> <span class="o">=</span> <span class="s2">"Here is a simple string of text that will help us demonstrate this function."</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">word_wrap</span><span class="p">(</span><span class="nv">$string</span><span class="p">,</span> <span class="mi">25</span><span class="p">);</span>
<span class="c1">// Would produce:</span>
<span class="c1">// Here is a simple string</span>
<span class="c1">// of text that will help us</span>
<span class="c1">// demonstrate this</span>
<span class="c1">// function.</span>
</pre></div>
</div>
</dd></dl>
<dl class="function">
<dt id="ellipsize">
<tt class="descname">ellipsize</tt><big>(</big><em>$str</em>, <em>$max_length</em><span class="optional">[</span>, <em>$position = 1</em><span class="optional">[</span>, <em>$ellipsis = '&hellip;'</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#ellipsize" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$str</strong> (<em>string</em>) – Input string</li>
<li><strong>$max_length</strong> (<em>int</em>) – String length limit</li>
<li><strong>$position</strong> (<em>mixed</em>) – Position to split at (int or float)</li>
<li><strong>$ellipsis</strong> (<em>string</em>) – What to use as the ellipsis character</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Ellipsized string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>This function will strip tags from a string, split it at a defined
maximum length, and insert an ellipsis.</p>
<p>The first parameter is the string to ellipsize, the second is the number
of characters in the final string. The third parameter is where in the
string the ellipsis should appear from 0 - 1, left to right. For
example. a value of 1 will place the ellipsis at the right of the
string, .5 in the middle, and 0 at the left.</p>
<p>An optional forth parameter is the kind of ellipsis. By default,
&hellip; will be inserted.</p>
<p>Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$str</span> <span class="o">=</span> <span class="s1">'this_string_is_entirely_too_long_and_might_break_my_design.jpg'</span><span class="p">;</span>
<span class="k">echo</span> <span class="nx">ellipsize</span><span class="p">(</span><span class="nv">$str</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="o">.</span><span class="mi">5</span><span class="p">);</span>
</pre></div>
</div>
<p>Produces:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nx">this_string_is_e</span><span class="o">&</span><span class="nx">hellip</span><span class="p">;</span><span class="nx">ak_my_design</span><span class="o">.</span><span class="nx">jpg</span>
</pre></div>
</div>
</dd></dl>
</div>
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