(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL fileinfo >= 0.1.0)
finfo_buffer -- finfo::buffer — Return information about a string buffer
Procedural style
$finfo,$string,$flags = FILEINFO_NONE,$context = nullObject-oriented style
$string, int $flags = FILEINFO_NONE, ?resource $context = null): string|falseThis function is used to get information about binary data in a string.
finfoAn finfo instance, returned by finfo_open().
stringContent of a file to be checked.
flagsOne or disjunction of more Fileinfo constants.
context
Returns a textual description of the string
argument, or false if an error occurred.
| Version | Description |
|---|---|
| 8.1.0 |
The finfo parameter expects an finfo
instance now; previously, a resource was expected.
|
| 8.0.0 |
context is nullable now.
|
Example #1 A finfo_buffer() example
<?php
$finfo = new finfo(FILEINFO_MIME);
echo $finfo->buffer($_POST["script"]) . "\n";
?>The above example will output something similar to:
application/x-sh; charset=us-ascii
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).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.