mime_content_type

Detect MIME Content-type for a file (PHP 4 >= 4.3.0, PHP 5)
string mime_content_type ( string filename )

Returns the MIME content type for a file as determined by using information from the magic.mime file. Content types are returned in MIME format, like text/plain or application/octet-stream.

例 1126. mime_content_type() example

<?php
echo mime_content_type('php.gif') . "\n";
echo
mime_content_type('test.php');
?>

上例将输出:

image/gif
text/plain