data://

data:// — 数据（RFC 2397）

说明

自 PHP 5.2.0 起 data:（» RFC 2397）数据流封装器开始有效。

用法

data://text/plain;base64,

可选项

**封装协议摘要**
属性	支持
受限于 allow_url_fopen	No
受限于 allow_url_include	Yes
允许读取	Yes
允许写入	No
允许追加	No
允许同时读写	No
支持 stat()	No
支持 unlink()	No
支持 rename()	No
支持 mkdir()	No
支持 rmdir()	No

范例

Example #1 打印 data:// 的内容


<?php
// 打印 "I love PHP"
echo file_get_contents('data://text/plain;base64,SSBsb3ZlIFBIUAo=');
?>

Example #2 获取媒体类型


<?php
$fp   = fopen('data://text/plain;base64,', 'r');
$meta = stream_get_meta_data($fp);

// 打印 "text/plain"
echo $meta['mediatype'];
?>

User Contributed Notes

from dot php dot net at brainbox dot cz 18-Nov-2010 04:37


When passing plain string without base64 encoding, do not forget to pass the string through URLENCODE(), because PHP automatically urldecodes all entities inside passed string (and therefore all + get lost, all % entities will be converted to the corresponding characters).





In this case, PHP is strictly compilant with the RFC 2397. Section 3 states that passes data should be either in base64 encoding or urlencoded.





VALID USAGE:


<?php


$fp = fopen('data:text/plain,'.urlencode($data), 'rb'); // urlencoded data


$fp = fopen('data:text/plain;base64,'.base64_encode($data), 'rb'); // base64 encoded data


?>





Demonstration of invalid usage:


<?php


$data = 'Günther says: 1+1 is 2, 10%40 is 20.';





$fp = fopen('data:text/plain,'.$data, 'rb'); // INVALID, never do this


echo stream_get_contents($fp);


// Günther says: 1 1 is 2, 10@ is 20. // ERROR





$fp = fopen('data:text/plain,'.urlencode($data), 'rb'); // urlencoded data


echo stream_get_contents($fp);


// Günther says: 1+1 is 2, 10%40 is 20. // OK





// Valid option 1: base64 encoded data


$fp = fopen('data:text/plain;base64,'.base64_encode($data), 'rb'); // base64 encoded data


echo stream_get_contents($fp);


// Günther says: 1+1 is 2, 10%40 is 20. // OK


?>

admin deskbitz net 02-May-2010 12:54


If you want to create a gd-image directly out of a sql-database-field you might want to use:





<?php


$jpegimage = imagecreatefromjpeg("data://image/jpeg;base64," . base64_encode($sql_result_array['imagedata']));


?>





this goes also for gif, png, etc using the correct "imagecreatefrom$$$"-function and mime-type.

sandaimespaceman at gmail dot com 06-Sep-2008 06:30


Now PHP supports data: protocol w/out "//" like data:text/plain, not data://text/plain,



I tried it.