Today we were introduced to PHP and given a homework assignment to read in its entirety for next week: PHP Tutorial
Good things to remember about PHP:
- PHP is server-side
- Before the server sends the requested .php doc to the client requester, it takes out the PHP and replaces it with what the PHP outputs - this means that when you "View Source" of a php webpage, it will show you the source code as it would read in the html
- Tags look like this: <?php ?>
- Always put dollar signs in front of variables
- You don't need to put PHP in the <head> since it is never seen by the browser
- Used to integrate with databases
- Can use the following Frameworks to simplify PHP: Symfony or Cake PHP
- Recommended to keep a separate file for functions
- Variables defined in the main PHP script can be reused in included scripts - what this means is if you define a variable in the PHP on your main page, you can reuse the same variable (with the same definition) in any "included" scripts
These are all equivalents to printing to the screen:
echo "Hello PHP"
= print("Hello PHP"); //another way to write it in PHP
= document.write("Hello PHP"); //in JavaScript
Loops:
for ($i=0; $i<10; $i++) {
echo $i;
echo "<br />";
}
Calling a Function:
<?php printSomething(); ?>
Templatizing:
function printSomething($title, $imgsrc, $description) {
print <<<END //<<<END allows you to print a function for multiple items
<div class="product">
<h2>{$title}</h2>>
<p>{$description}</p>
<img src="{$imgsrc}" />
}
In the body:
<? php printSomething("Product 1","images/product1.jpg","something")?>
Including a separate PHP file for reusability across pages:
<?php include("includes/top_nav.php")> //include is a built-in PHP function
Shorthand for Echoing a Variable
<title><? = $pageTitle ?></title>
1 comment:
Great notes! Thanks for posting.
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