Few Questions

[Lamez]

1.Variables, could I do this:

 

<?php

$var = "cat";

echo "I love $var";

$var ="dog";

echo "I love $var";

?>

and the output will be

I love cat

I love dog

 

2.How do I do this

page.php?action=members&user

or

page.php?action=login&pass&user

 

or somting like that

[fert]

$_GET['name_of_var']

[Lamez]

I know that, but how do I do this

 

?action=page&somthing

[obsidian]

1. Yes. Try it out. Every time you run the assignment operator on a variable, you effectively overwrite the previous value.

 

2. First off, to retrieve information from the URL, you need to use the $_GET global. This is an array that is set up in PHP to automatically return any parameters passed via the URL. However, based on your sample, I would definitely encourage you to never pass user information such as password, SSN, etc through the URL. Always use POST (and preferably a secure server for the SSN and any other personal info). Check out this page of the PHP manual for details on the predefined variables including $_GET.

[obsidian]

I know that, but how do I do this

 

?action=page&somthing

 

In and of itself, that sets the variable something but doesn't assign a value to it, so it's pretty much worthless. If you are attempting to assign multiple values to a single variable, you may want to do something like this:

 

URL: index.php?cat=1,2,3,4

<?php
$cats = explode(',', $_GET['cat']);
?>

[Lamez]

hmm, well I would never pass information via URL, I do though use post data.

 

Well thanks for the information guys.

 

I will have to look at that link on variables. But what I set would it work?

[Lamez]

<?php
$test = $_GET['page'];
if ($test == ("page" && "this")){
echo "ya you found the page";
}else{
echo "nothing here";
}

?>

 

would that work out as:

 

?page&this

[deadonarrival]

?action=page&somthing=value

 

You can then use

$action = $_GET['action'];

$something = $_GET['something'];

[Lamez]

another thing, what exactly are arrays good for? I love using

mysql_fetch_array()

, but that is the only array I have ever used

[deadonarrival]

Arrays are great for storing lists of similar things.

 

eg colours are similar, with just different names:

<?php
$colours = array("Red","Orange","Yellow","Green","Blue","Indigo","Violet");

print "In the rainbow the colours are:";
foreach ($colours as $key => $value)
{
  print "<li>$value</li>";
}
?>

 

Obviously not too useful, but what if you make an array with all the countries in the world, or states in america, or maybe months in a year. How about car manufacturers?

 

If someone wants to sign up to your site, you can have a drop-down box with a list of all the countries in the world, using a similar loop to the one above. Or you could have the same for car manufacturers.

 

Say you made a website for a garage, and wanted a set of checkboxes

<?php
$extras = array("pas"=>"Power Assisted Steering","alloys"=>"Alloy Wheels","CD"=>"CD player","SUN"=>"Sun Roof");

print "Which extras do you require?";
foreach($extras as $key => $value)
{
print "<input type=\"checkbox\" name=\"extras\" value=\"$key\" />$value<br />";
}
?>

 

Would produce

 

Which extras do you require?

[ ] Power Assisted Steering

[ ] Alloys

[ ] CD Player

[ ] Sun Roof

 

And if there were 50 extras, it would save you a fair bit of typing making all those input fields.