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<a class="left" target="_top" href="php_ajax_intro.asp" >AJAX Introduction</a><br />
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<h1>Introduction to PHP</h1>
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<p class="intro">A PHP file may contain text, HTML tags and scripts.
Scripts in a PHP file are executed on the server.</p>
<hr />


<h2>What You Should Already Know</h2>
<p>Before you continue you should have a basic understanding of the following:</p>
<ul>
  <li>HTML / XHTML</li>
	<li>Some scripting knowledge</li>
</ul>
<p>If you want to study these subjects first, find the tutorials on our
<a href="../default.asp">Home page</a>.</p>
<hr />


<h2>What is PHP?</h2>
<ul>
<li>PHP stands for <b>P</b>HP: <b>H</b>ypertext <b>P</b>reprocessor</li> 
<li>PHP is a server-side scripting language, like ASP</li> 
<li>PHP scripts are executed on the server</li>
<li>PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid,
  PostgreSQL, Generic ODBC, etc.)</li>
<li>PHP is an open source software (OSS)</li>
<li>PHP is free to download and use</li> 
</ul>

<h2>What is a PHP File?</h2>
<ul>
<li>PHP files may contain text, HTML tags and scripts</li>
<li>PHP files are returned to the browser as plain HTML&nbsp;</li>
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