Principle: Use ob_flush() and flush() to output the contents of the buffer in advance, and the browser can load this part in advance content, no need to wait for all output to complete before loading.
Divide the page content into small blocks, output one and then the next, so that users can see the page content as early as possible and optimize the user experience.
First of all, the content of head should be loaded first, and static content such as css and javascript should be loaded as early as possible. Therefore, flush() should be used to output after head.
Example: First output the head static content, then divide each into a chunk, and output it every second.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title> Big Pipe </title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<style type="text/css">
body{margin:0px; background:#CCCCCC;}
p{text-align:center; margin:10px;}
img{width:450px;}
</style>
</head>
<?php cache_flush() ?>
<body>
<p><img src="/static/imghwm/default1.png" data-src="http://image.tianjimedia.com/uploadImages/2013/240/5CPOE4UZ2T40.jpg" class="lazy" alt="How to implement BigPipe chunked output through php" ></p>
<?php cache_flush(); ?>
<p><img src="/static/imghwm/default1.png" data-src="http://image.tianjimedia.com/uploadImages/2013/240/6893CY9XEQD1.jpg" class="lazy" alt="How to implement BigPipe chunked output through php" ></p>
<?php cache_flush(); ?>
<p><img src="/static/imghwm/default1.png" data-src="http://image.tianjimedia.com/uploadImages/2013/240/83H52SG02V32.jpg" class="lazy" alt="How to implement BigPipe chunked output through php" ></p>
</body>
</html>
<?php
function cache_flush($sec=1){
ob_flush();
flush();
usleep($sec*1000000);
}
?>Issues to note:
1. Try to use one output to output as much content as possible.
2. Try to load synchronously.
3. The more chunks are divided, the better. It depends on the actual demand.
4.ob_flush() and flush() must be used at the same time, because flush() will have no effect in some cases.
This article explains how to implement BigPipe block output through php. For more related content, please pay attention to the php Chinese website.
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