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| <h1>Custom Function Calls</h1> |
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| <h2>$this->db->call_function();</h2> |
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| <p>This function enables you to call PHP database functions that are not natively included in CodeIgniter, in a platform independent manner. |
| For example, lets say you want to call the <dfn>mysql_get_client_info()</dfn> function, which is <strong>not</strong> natively supported |
| by CodeIgniter. You could do so like this: |
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| <code>$this->db->call_function('<var>get_client_info</var>');</code> |
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| <p>You must supply the name of the function, <strong>without</strong> the <var>mysql_</var> prefix, in the first parameter. The prefix is added |
| automatically based on which database driver is currently being used. This permits you to run the same function on different database platforms. |
| Obviously not all function calls are identical between platforms, so there are limits to 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 the second parameter.</p> |
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| <code>$this->db->call_function('<var>some_function</var>', $param1, $param2, etc..);</code> |
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| <p>Often, you will either need to supply a database connection ID or a database result ID. The connection ID can be accessed using:</p> |
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| <code>$this->db->conn_id;</code> |
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| <p>The result ID can be accessed from within your result object, like this:</p> |
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| <code>$query = $this->db->query("SOME QUERY");<br /> |
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| <var>$query->result_id;</var></code> |
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