Computer Science Canada

[Tutorial] Very Basic
Author:  octopi [ Sun Jun 01, 2003 12:31 am ]
Post subject:  [Tutorial] Very Basic
Basic Tutorial

The most basic php program

code:
<?php
  header("Content-type: text/html\n\n");
  echo "Text";
?>



To print data, you can use either the print, echo, or header function.
Header is used to output headers to the browser.

code:
header("Content-type: text/html\n\n");


Print and echo are used to output data.

code:
  print ("text");
  print "text";
  echo "text";



Varibles:

code:
$name="Name";
echo "$name";
//outputs: 'Name'


Getting data from the user:
There are two methods to get data from the user, GET, and POST
When someone accesses your program like this

program.php?name=SOMETHING

That is using the GET method.

When someone uses a form it can either be in GET, or POST

code:
<form method="GET">
...
</form>

OR
code:
<form method="POST">
...
</form>



To access these varibles you can do:
code:
$name=$_GET['name']; //or
$name=$_POST['name'];

or this:
code:
($name=$_GET['name']) || ($name=$_POST['name']);


the above will get the GET, and POST methods (usually there is only one method used at a time, so it shouldn't be a problem)


Conditionals:

code:
if($name) {    //if name has a value
  echo "stuff here";
}


code:
if(!$name) {     //if name doesn't exist
  echo "stuff here";
}



code:
if($name == "octopi") {
  echo "stuff here";
}



code:
if($name == $somethingelse) {
  echo "stuff here";
}
elseif ($name == $myotherthing) {
  echo "check this if the above fails";
}
else {
  echo "something else";
}

:


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