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

示例 #1 打印 data:// 的内容

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

示例 #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'];
?>
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User Contributed Notes 3 notes

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13
from dot php dot net at brainbox dot cz
10 years ago
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
?>
up
12
admin deskbitz net
10 years ago
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.
up
9
sandaimespaceman at gmail dot com
12 years ago
Now PHP supports data: protocol w/out "//" like data:text/plain, not data://text/plain,

I tried it.
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