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Introduction to PHP - the basics of PHP coding

Advantages over HTML

PHP Basic Commands

<?php
echo "Testing displaying this info using PHP";
?>

<?php
$test = 'Testing PHP variables';
echo $test; // this will display the variable '$test'

/* to comment on multiple
lines, use the forward slash and the star, but remember to close it again
otherwise your code will not work!
*/

// creating arrays can be just as easy
$test1[name] = 'RSAWeb';
$test1[website] = 'www.rsaweb.co.za';
$test1[service] = 'web hosting';
?>

Forms

<form action='contact.php' method='POST'>
<input type='text' name='companyname' value=''>
<input type='submit' name='submit' value='submit'>
</form>

<?php
echo "Company Name: " . $_POST[companyname];
?>

Mathematical & Arithmetic Operations

<?php
// example 1
$num1 = 5;
$num2 = 6;
$num3 = $num1 + $num2;
// $num3 will equal 11

Loops, Whiles, Fors etc

<?
// FOR example will echo out the $x value on a new line each time
for ($x=0;$x<10;$x++)
{
echo "<BR>Number: " . $x;
}

// WHILE example will each out the $x value until 10 is reached
while ($x < 10)
{
echo "<BR>Number: " . $x;
}

// IF / ELSE / ELSEIF example
if ($x == 5)
{
// if $x is 5 do this setup
echo "IF";
} elseif ($x == 10)
{
// if $x is 10 do this setup
} else {
// if $x is anything else, do this setup
}
?>

Database Integration

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