Simple PHP An Introduction
Interpreting PHP Local Machine: Live Server Interpreter compiles code Run WAMP, LAMP, or MAMP in background & Access pages through it Live Server Most hosts provide PHP interpreter Interpreter compiles code Translates to displayable HTML Performs other operations
File Extension – Web Page .php Lets server know it needs to pass that code to interpreter If page would have been HTML, still have regular doctype definition and other HTML <!doctype html>
File Extension – Style SHeet .php 1st line in file must be: <?php header(“content-type: text/css”); ?> When link stylesheet to html, code is the same except for altered file extension Ex: <link href="stylephp.php" rel="stylesheet" type="text/css" />
Embedding PHP <?php ?> PHP can be Only code in file Embedded in portions along with other HTML Embedded in portions along with CSS <?php ?> Your Code Goes Here!
<body> <h2>This is the first PHP coding section</h2> <?php echo "This is <i>PHP code</i>\n"; ?> <h2>This is the second PHP coding section</h2> <?php echo "This is <b>more</b> PHP code\n"; ?> </body>
//nothing on this line will run or display ?> Comments <?php //nothing on this line will run or display ?> <?php /* This is a multiline comment. I can keep typing until I close the comment off */ ?>
Outputting Display Text & HTML Command: echo To have output display on page, php between body tags Can output numbers without surrounding characters Text must be surrounded with double or single quotes
<?php echo 15; //outputs the number 15 onto the web page echo "<br />"; //outputs a break onto the web page echo "this is a sentence"; //outputs text onto web page echo 'this is also a sentence'; //outputs text ?>
<head> </head> <?php echo “<title> My Webpage ?> </head>
Simple Math Operator Symbol Operation Performed + Addition - Subtraction * Multiplication / Division % Modulus (finds remainder of division problem)
<body> <?php echo "5+5="; //with quotes, displays literal text echo 5+5; //without quotes, performs calculation echo "<br />"; echo "10-5="; echo 10-5; ?> </body>
Example Full Page + PHP
Example Stylesheet + PHP