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    <h1>Do not convert mysql_ functions to mysqli_. Period.</h1> <p>There is not a single reason to do that. </p> <p><strong>First, there is no reason to do that just mechanically, changing only function names leaving algorithm the same:</strong></p> <p>Without implementing parameterized queries such a move makes very little sense.<br> If your only concern is "Deprecated" errors - you can just turn them off with </p> <pre><code>error_reporting(E_ALL &amp; ~E_DEPRECATED); </code></pre> <p>and continue happily using old mysql_*<br> Note that you will need that only in 2-3 years, when PHP 5.5 will reach shared hostings.<br> So, there is no need to hurry as well.</p> <p><strong>Second, what you really need is to eliminate all the bare API calls from the code</strong></p> <p>encapsulating them in to some sort of abstraction library. This should be your main concern, not a particular API used in this library, which could be changed in a wink.</p> <p><strong>Finally, the only real reason for switching from <code>mysql_*</code> to <code>mysqli_*</code> is parameterized queries.</strong></p> <h2>And mysqli is totally unusable with them.</h2> <p>With prepared statements PDO is the only choice you have.</p> <p>Let me show you what I mean.<br> Imagine we have an array of checkboxes from HTML form to add into query dynamically.<br> With PDO we can have some relatively sane and quite concise (however still uselessly complex and polluted) code:</p> <pre><code>$in = str_repeat('?,', count($_GET['cat']) - 1) . '?'; $sql = "SELECT * FROM table WHERE category IN ($in)"; $stm = $db-&gt;prepare($sql); $stm-&gt;execute($_GET['cat']); $data = $stm-&gt;fetchAll(); </code></pre> <h2>With mysqli such a trivial case will take you hours of writing and debugging several pages of extremely intricate code.</h2> <p>Just try it and see. </p> <p>However, even PDO require some obscure and useless code to create certain query parts. So, the best way would be to use some more intelligent library, such as <a href="https://github.com/colshrapnel/safemysql" rel="nofollow">safemysql</a>, which will do all the job internally, from binding to fetching, <strong>making all your code into single line</strong>:</p> <pre><code>$data = $db-&gt;getALL("SELECT * FROM table WHERE category IN (?a)", $_GET['cat']); </code></pre>
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    1. POHow do I convert a script using mysql_ functions to use mysqli_ functions?
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    1. USYour Common Sense
    1. USYour Common Sense
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      1. VTDownMod
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    1. COCan you add reasons for that?
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      1. USJohn Dvorak
    2. COThe point of the article is to make it easy for people who are still using mysql_ functions to move away from the deprecated functions.
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      1. USNicholas Pickering
    3. COOne major reason is preventing SQL Injection (http://php.net/manual/en/security.database.sql-injection.php).
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      1. USMatt Browne
 

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