Zend Engine

<h2 id="architecture">Architecture</h2>
<p>Zend Engine is used internally by PHP as a compiler and runtime engine. 
PHP Scripts are loaded into memory and compiled into Zend <a href="/facts/Opcodes/UaLMp56C">opcodes</a>. 
These opcodes are executed and the HTML generated is sent to the client.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a>
</p><p>To implement a Web script interpreter requires three parts:
</p>
<ol><li>The interpreter part analyzes the input code, translates it, and executes it.</li>
<li>The functionality part implements the functionality of the language (its functions, etc.).</li>
<li>The interface part talks to the Web server, etc.</li></ol>
<p>Zend takes part 1 completely and a bit of part 2; PHP takes parts 2 and 3.
</p><p>Zend itself really forms only the language core, implementing PHP at its very basics with some predefined functions.
</p>
<h2 id="see-also">See also</h2>
<ul><li> Free and open-source software portal</li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://www.php.net/">Official website</a> </li>
<li><a href="https://web.archive.org/web/20110813194014/http://www.zend.com/engine2/ZendEngine-2.0.pdf">"Zend Engine 2.0 Design"</a> (PDF). Archived from <a href="http://www.zend.com/engine2/ZendEngine-2.0.pdf">the original</a> (PDF) on 13 August 2011.</li>
<li><a href="https://github.com/php/php-src">Official git repository</a></li>
<li><a href="https://wiki.php.net/internals/engine">"Zend Engine Documentation"</a>. <i>PHP development wiki</i>. 22 September 2017.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"Zend engine". PHP Internals Book. Retrieved 4 October 2021. <a href="http://www.phpinternalsbook.com/php7/zend_engine.html" target="_blank">http://www.phpinternalsbook.com/php7/zend_engine.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Zend's History with PHP". Zend Technologies. <a href="http://www.zend.com/en/community/php/" target="_blank">http://www.zend.com/en/community/php/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"PHP: General Information - Manual". php.net. Retrieved 22 November 2019. <a href="https://www.php.net/manual/en/faq.general.php#faq.general.relation-versions" target="_blank">https://www.php.net/manual/en/faq.general.php#faq.general.relation-versions</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Gutmans, Andi (14 July 1999). "- License update · php/php-src@fec59d3". Retrieved 26 December 2021. <a href="https://github.com/php/php-src/commit/fec59d3b4da7fdc111dd0af19a4b0488dc817fc7" target="_blank">https://github.com/php/php-src/commit/fec59d3b4da7fdc111dd0af19a4b0488dc817fc7</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>"PHP - What is zend engine?". careerride. <a href="http://www.careerride.com/PHP-zend-engine.aspx" target="_blank">http://www.careerride.com/PHP-zend-engine.aspx</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
</ol>

Zend Engine open-in-new

Zend Engine