How to include two or more, variables inside a function [ ex: foo( ); ]

I have this function

function foo($type){

	if(isset($_GET['a_id']) && !empty($_GET['a_id'])){	
			$page = $_GET['a_id'];
			$query = "SELECT $type FROM d_articles WHERE a_id = '$page'";
			$result = mysql_query($query);


			while($row=mysql_fetch_array($result))
			{ return " $row[$type]" ;}
		} 

Code (markup):

In the above examples, I need to check 2 variables instead of one. i.e $type and $id, so How can I add that in the foo(); and inside the SELECT $type..


And at last I need to echo it like

<?php echo foo(); ?> 

Code (markup):

How do I include both varibles inside the foo

 

You would use:

function foo($type, $id) {

    if (isset($_GET['a_id']) && !empty($_GET['a_id'])) {
        $page = $_GET['a_id'];
        $query = "SELECT $type FROM d_articles WHERE a_id = '$page'";
        $result = mysql_query($query);


        while ($row = mysql_fetch_array($result)) {
            return " $row[$type]";
        }
    }
}

PHP:

You can access $id within the function as needed as long as you pass the parameter.

This: <?php echo foo(); ?> would fail because you are not passing the type or id parameters to it.

Here's a brief overview of passing and returning values from functions: http://www.php.net/manual/en/functions.arguments.php and http://www.php.net/manual/en/functions.returning-values.php

 

I would suggest you also escape your variables you are using:

function foo($type, $id) {

    if (isset($id) && isset($type)) {
        $query = "SELECT $type FROM d_articles WHERE a_id = '$id'";
        $result = mysql_query($query);


        while ($row = mysql_fetch_array($result)) {
            return $row[$type];
        }
    }
}

$type = mysql_real_escape_string($_GET['type']);
$id = mysql_real_escape_string($_GET['id']);
echo foo($type, $id);

PHP:

 

function foo($type, $id) {

if (isset($id) && isset($type)) {
$query = "SELECT $type FROM d_articles WHERE a_id = '$id'";
$result = mysql_query($query);


while ($row = mysql_fetch_array($result)) {
return $row[$type];
}
}
}

$type = mysql_real_escape_string($_GET['type']);
$id = mysql_ insert_ id($_GET['id']);
echo foo($type, $id);