Understanding custom functions

[graham23s]

Hi Guys,

 

i am starting to use more and more functions now but was curious on a few things, this function i wrote quickly:

 

function is_valid_image_type($image_file_type)
{
if($image_file_type != "image/pjpeg")
{
  return false;
} else {
  return true;
}
}

 

part of the code that i have implemented it in:

 

  if(isset($_POST['submit']))
  {
   // misc vars - max file size 1mb //
   $max_size = 1048576;
   
   // POST vars for the image //
   $image_file_name = $_FILES['image']['name'];
   $image_file_size = $_FILES['image']['size'];
   $image_file_temp = $_FILES['image']['tmp_name'];
   $image_file_type = $_FILES['image']['type'];
   
   // POST for the usual data //
   $product_name = mysql_real_escape_string(ucwords(strtolower($_POST['product_name'])));
   $product_desc = $_POST['product_desc'];
   $product_caid = $_POST['product_cat_id'];
   $product_pice = $_POST['product_price'];
   
   // empty fields //
   if($image_file_size <= 0)
   {
    standard_message("Error","You never uploaded a product image!");
   }
   if(empty($product_name))
   {
    standard_message("Error","You never entered the products name!");
   }
   if(empty($product_desc))
   {
    standard_message("Error","You never entered a description about the product!");
   }
   // file type //
   //if($image_file_type != 'image/pjpeg')
   //{
   // standard_message("Error","Your uploaded image file doesn't seem to be a .jpg");
   //}
   // file size //
   if($image_file_size > $max_size)
   {
    standard_message("Error","Your uploaded image file is bigger than 1mb");   
   }
   
   // get the files extension //
   //$extension = substr(strrchr($image_file_name, '.'),0);
   
   // lower case the extension //
   //$extension = strtolower($extension);
   
   // check the file type //
   $test = is_valid_image_type($image_file_type);
   print $test;

 

so in the function when i return false, i assume that returns 0 and true a 1?, also once the function returns either a 0 or a 1, is it up to me to do something with the digit to stop the script?

 

thanks for any help guys

 

Graham

 

[trq]

so in the function when i return false, i assume that returns 0 and true a 1?, also once the function returns either a 0 or a 1, is it up to me to do something with the digit to stop the script?

 

Most functions (built in or custom) return true or false. So you would call your function like any other....

 

<?php
if (is_valid_image_type($image_file_type)) {
  echo "Image is valid";
} else {
  echo "Image not valid";
}
?>