php file upload, how to restrict file upload type

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The below just uses the mime types to validate a file, then checks the size of both. For a list of most mime types see here or google.

function allowed_file(){

//Add the allowed mime-type files to an 'allowed' array 
 $allowed = array('application/doc', 'application/pdf', 'another/type');

//Check uploaded file type is in the above array (therefore valid)  
    if(in_array($_FILES['resume']['type'], $allowed) AND in_array($_FILES['reference']['type'], $allowed)){

   //If filetypes allowed types are found, continue to check filesize:

  if($_FILES["resume"]["size"] < 400000 AND $_FILES["reference"]["size"] < 400000 ){

    //if both files are below given size limit, allow upload
    //Begin filemove here....

    }

    }

}

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