Difference between WebService and API

S.No	Web Service	API
1	Interaction between two machines over a network.	Interaction between two API.
2	Uses SOAP, REST, and XML-RPC as a means of communication.	It may use any way to communication
3	Web Services involves calling of system.	We can render form in one line, one by one element, element OR  decorator OR error separately.
4	Web service might not contain a complete set of specifications and sometimes might not be able to perform all the tasks that may be possible from a complete API.	An API consists of a complete set of rules and specifications for a software program to follow in order to facilitate interaction.
5	All Web services are APIs	All APIs are not Web services
6	A Web service always needs a network for its operation	API doesn't need a network for its operation
7	WebServices are services available over internet. You can call these services and get so information in your application without know how it works. For example weather webservices gives you information about the city weather.	API is a collection of class which provide you some functionality like Google api gives google-search.

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PHP Check Mime Type of File - Return Information About A File

Now a days, we are uploading files like Profile images, Video files OR excel files in our web application. 
With uploading these files there are chances some user upload the .exe file (Virus) by renaming the .exe into .jpg, which can damage website.

You might have added the extension check from javaScript as well as PHP. But this is not enough from security end because someone can upload the file after changing the extension of file( ".exe" to ".png"). In this case your security check will be failed.

What to do.
Answer is  check the Mime of file before get uploaded in your web server.

How to do this
"fileinfo" is extension which must be enabled in your php.ini. (for existence you can check  in phpinfo)
If this extension is not enabled ask your server admin, he will do this for you OR you can also do this your self (http://php.net/manual/en/fileinfo.installation.php).


After installing the fileinfo extension, use following code to get the mime type of file before get uploaded in web server.

if (function_exists("finfo_file")) {
    $finfo = finfo_open(FILEINFO_MIME_TYPE);    

    //file which you want to check the mime of the file
    $file = $_SERVER['DOCUMENT_ROOT'] . '/images/feedback.png';    //file which is going to get uploaded in web server
    try {
        $type = finfo_file($finfo,$file);        
        echo "File Type: ".$type;
    } catch (Exception $e) {
        echo $e->getMessage();
    }
} else {
    echo "'finfo_file' is Not installed";
}

When you execute above code, if will get the mime-type of file. This is directly checking the mime type of already uploaded file.
You can use $type = finfo_file($finfo,$file); for checking the file type, before using move_uploaded_file function.

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