多个错误的表单验证

Question

What would be the best way to code for the following

1. To check if its empty
2. That its alpha
3. Length

I am wanting a way that I am able to combine the following if statements

Current Code

if (isset($_POST['submitButton'])) { 

    $fullName      = $_POST['fullname'];

    if(fullName != ' ')
      {
        $errorfullName .= 'Please Enter Your Name';
      }

      }
    }

if statements that need to be included:

if (!ctype_alpha(str_replace(array("'", "-"), "",$fullName))) { 
            $errorfullName .= '<span class="errorfullName">*First name should be alpha characters only.</span>';
}

if (strlen($fullName) < 3 OR strlen($fullName) > 40) {
            $errorfullName .= '<span class="errorfullName">*First name should be within 3-40 characters long.</span>';
}

Answer 1

Your are missing $ sign before fullName.Use empty function to check weather the string is empty or not. Use the below code

  if (isset($_POST['submitButton'])) { 

        $fullName      = $_POST['fullname'];

        if(empty($fullName))
          {
            $errorfullName .= 'Please Enter Your Name';
          }

          }