Data URI scheme_PHP tutorial
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Data URI scheme is a URI scheme (uniform resource locator pattern).
The well-known site reference resource files are in a format similar to http://www.chenwei.ws/demo.png, but the data URI scheme provides a method to embed external resources into web pages.
It is in the form of a file or document. This technology allows ordinary elements such as images to be fetched and style sheets to be placed in a single http request, replacing many http requests. (Equivalent to becoming a part of the web page)
---------------------------------@author chenwei
Usage=>
HTML:
<span><</span><span>img </span><span>src</span><span>="data:image/png;base64,iVBORw0Rw0KGgoAA......"</span><span>></span>
CSS:
<span>div </span>{<span>background</span>:<span> red url('data:image/png</span>;<span>base64,iVBORw0Rw0KGgoAA......') no-repeat scroll left top;</span>}JavaScript: (not supported by IE8)
<script><span> window.open(</span>'data:text/html;charset=utf-8,' +<span> encodeURIComponent( </span>'<!doctype html>' + 'html lang='en'<span> + </span>'<head><title>Embedded Window</title></head>'<span> + </span>'<body><h2>42</h2></body>'<span> + </span>'</html>' <span> ); </span></script>
data represents the data name, image/png is the data type name; base64 is the data encoding method, followed by base64-encoded data.
The types supported byData URI scheme are:
data:, text data
data:text/plain, text data
data:text/html,HTML code
data:text/html;base64,base64 encoded HTML code
data:text/css,CSS Code
data: text/css; base64, base64 encoded CSS code
data: text/javascript, Javascript code
data :text/javascript;base64, base64-encoded Javascript code
data:image/gif; base64, base64-encoded gif image data
data:image/png; base64,base64 encoded png image data
data:image/jpeg;base64,base64 encoded jpeg image data
data:image/x-icon;base64, Base64 encoded icon image data
Note: You can use the function base64_encode() to encode in PHP, base64_encode(file_get_contents('demo.png'));
Copy the following data into the browser and see what it is.
data:text/plain;base64,d3d3LmNoZW53ZWkud3M=
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Reference Wiki: http://en.wikipedia.org/wiki/Data:_URL
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