if(isValidForm($strTempName, $strTempTelephone, $strTempMobile, $strTempEmail, $strTempConfirmEmail, $strTempCity))

{
    //Mail the form.
    //Call MaiForm Function.
    MailForm($strTempName, $strTempAddress, $strTempPostcode, $strTempTelephone, $strTempMobile, $strTempEmail, $strTempConfirmEmail, $strTempCity, $strTempCelebration, $strTempStartDate, $strTempGroupSize, $strTempEnquiry, $strTempBrochure, $strTempHeardAbout) ;

    //Write out a thank you.
    //WriteMessage($strTempName, $strTempAddress, $strTempPostcode, $strTempTelephone, $strTempMobile, $strTempEmail, $strTempCity, $strTempCelebration, $strTempStartDate, $strTempGroupSize, $strTempEnquiry, $strTempBrochure, $strTempHeardAbout) ;
    echo "Thank you for your enquiry, a member of our reservation team will get back to you within 24 hours.";
}
else
{
    //Send an Error.
    echo "<div align=center" ;
    echo "It appears that you have left out one of the fields.<br>" ;
    echo "Please go back and fill in these missing fields.<br><br>" ;
    //Display the error.
    echo $strError ;

}

function isValidForm($strTempName, $strTempTelephone, $strTempMobile, $strTempEmail, $strTempConfirmEmail, $strTempCity, $strTempEmail == $strTempConfirmEmail)
{
    //Set strError Variable to global so we can use the Variable
    //outside of the function.
    global $strError ;
    
    //Initiate the variable by setting it eqaul to nothing.
    $strError = "" ;

    if($strTempName == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Name field.<br>" ;
    }


    if($strTempTelephone == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Telephone field.<br>" ;
        }
        
    if($strTempMobile == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Mobile field.<br>" ;
        }
        
    if($strTempEmail == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Email field.<br>" ;
        }
        
    if($strTempConfirmEmail == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Confirm Email field.<br>" ;
        }
        
     if($strTempCity == "")
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Chosen City field.<br>" ;
        }
        
         if($strTempEmail != $strTempConfirmEmail)
    {
        //Build the string error message by Cocantenating the strError Variable
        //to itself.
        $strError .= "Email does not match.<br>" ;
        }
    //Test to see if the strError Variable contains a message
    //If it does then return false (not an valid form).
    //If strError Variable is empty or "" then return true (is a valid form).
    if($strError != "")
    {
        return false ;
    }
    else
    {
        return true ;
    }
}

function custom_empty( $val )
{
    if( $val === '' ||
        $val === 0 ||
        $val === '0' ||
        $val === null ||
        $val === false ||
        $val === array() )
    {
        return true;
    }
    
    return false;
}