(PHP 5 >= 5.3.0, PHP 7, PECL fileinfo >= 0.1.0)
finfo_buffer -- finfo::buffer — 返回一个字符串缓冲区的信息
过程化风格
$finfo
, string $string = NULL
[, int $options = FILEINFO_NONE
[, resource $context = NULL
]] ) : string面向对象风格
$string = NULL
[, int $options = FILEINFO_NONE
[, resource $context = NULL
]] ) : string本函数用来获取字符串中二进制数据的信息。
finfofinfo_open() 函数返回的 Fileinfo 资源。
string要检查的文件内容。
options一个 Fileinfo 常量 或多个 Fileinfo 常量 进行逻辑或运算。
context
返回 string 参数所指定内容的类型描述。
发生错误时返回 FALSE 。
Example #1 finfo_buffer() 函数例程
<?php
$finfo = new finfo(FILEINFO_MIME);
echo $finfo->buffer($_POST["script"]) . "\n";
?>
以上例程的输出类似于：
application/x-sh; charset=us-ascii
You should never rely on finfo::buffer to get the MimeType of a file, you must always save the file physically or temporariliy and use finfo_open to get MimeType. I tested it with an excell file, with buffer it says octet-stream that is not valid, with finfo_open it says ms-excell as correct.
Get only a webpage content type and forget the charset
<?php
$file = new finfo(FILEINFO_MIME);
echo strstr($file->buffer(file_get_contents('http://example.com')),';',true)//Returns something similar to text/html
?>
Get only a webpage content type and forget the charset
<?php
$file = new finfo(FILEINFO_MIME);
echo strstr(file_get_contents('http://example.com'),';',true); //Returns something similar to text/html
?>
You can easily check mime type of an internet resource using this code :
<?php
function getUrlMimeType($url) {
$buffer = file_get_contents($url);
$finfo = new finfo(FILEINFO_MIME_TYPE);
return $finfo->buffer($buffer);
}
?>
I'm using it to detect if an url given by a user is a HTML page (so I do some stuff with the HTML) or a file on Internet (so I show an icon accordingly to the mime type).