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<div class="section" id="custom-function-calls">
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<h1>Custom Function Calls<a class="headerlink" href="#custom-function-calls" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="db-callfunction">
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<h2>$db->callFunction();<a class="headerlink" href="#db-callfunction" title="Permalink to this headline">¶</a></h2>
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<p>This function enables you to call PHP database functions that are not
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natively included in CodeIgniter, in a platform independent manner. For
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example, let’s say you want to call the mysql_get_client_info()
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function, which is <strong>not</strong> natively supported by CodeIgniter. You could
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do so like this:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$db</span><span class="o">-></span><span class="na">callFunction</span><span class="p">(</span><span class="s1">'get_client_info'</span><span class="p">);</span>
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</pre></div>
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</div>
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<p>You must supply the name of the function, <strong>without</strong> the mysql_
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prefix, in the first parameter. The prefix is added automatically based
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on which database driver is currently being used. This permits you to
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run the same function on different database platforms. Obviously not all
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function calls are identical between platforms, so there are limits to
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how useful this function can be in terms of portability.</p>
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<p>Any parameters needed by the function you are calling will be added to
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the second parameter.</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$db</span><span class="o">-></span><span class="na">callFunction</span><span class="p">(</span><span class="s1">'some_function'</span><span class="p">,</span> <span class="nv">$param1</span><span class="p">,</span> <span class="nv">$param2</span><span class="p">,</span> <span class="nx">etc</span><span class="o">..</span><span class="p">);</span>
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</pre></div>
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</div>
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<p>Often, you will either need to supply a database connection ID or a
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database result ID. The connection ID can be accessed using:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$db</span><span class="o">-></span><span class="na">connID</span><span class="p">;</span>
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</pre></div>
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</div>
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<p>The result ID can be accessed from within your result object, like this:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$query</span> <span class="o">=</span> <span class="nv">$db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s2">"SOME QUERY"</span><span class="p">);</span>
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<span class="nv">$query</span><span class="o">-></span><span class="na">resultID</span><span class="p">;</span>
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</pre></div>
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