check file type and size (PHP)

function check_file_type($file) {
    //$allowed_extensions = ['jpg','jpeg','png','gif','pdf','docx'];
    //$allowed_fileTypes = ['image/jpeg','image/png','image/gif','application/pdf','application/msword'];
    $allowed_types = array('image/jpeg','image/png','application/pdf','application/msword','application/vnd.ms-excel','application/vnd.openxmlformats-officedocument.spreadsheetml.sheet','text/csv');
    if(!in_array($file['type'],$allowed_types)) {
        wp_send_json_error(array('message' => 'Invalid file type,please upload jpeg\png\pdf\winword'));
    }
 }

 function check_file_size($file) {
    $max_size = 5*1024*1024;
    if($file['size'] > $max_size) {
        wp_send_json_error(array('message'  => 'File sieze exceeds the maximum limit of 5m'));

    }
 }