Introduction to PHP Small Knowledge _php Foundation

1. Download an integrated environment software, that is, others put all the chaos of seven or eight in a piece, made software, this is the SG type, I think beginners with this good point;
2. Each download installation. Php.zend.apache; This method is the most chaotic, and it is not clear yet.

I have IIS installed on the machine, which is just a PHP and Zend. Now you can run both PHP and ASP on the server.

PHP is embedded in HTML and is run as follows:

<?php
$a = "Hello";
$b = "PHP";
echo $a. $b;
?>

Description
Define a variable with the $ variable name, such as the $a on the $b, the reference to this variable also use the $ variable name to reference;
After each statement, add '; ' Indicates the end of the letter;
Output with the Echo output content;
$a, $b, the '. ' The number is used to connect two strings.

The results of the above program are:

Hello, php!.

To output PHP information:

<?php
Phpinfo ();
?>


The IF statement in PHP:

<?php
$a = 10;
$b = 1;
if ($a = = $b) {
echo "A=b";
}
?>
The output results are:

A=b

MD5 password function, the people who have done the web know MD5, this in PHP is just a function, call on OK:

<?php
$a = "PHP";
$b =md5 ($a);
Echo $b;
?>

The output results are:

e1bfd762321e409cee4ac0b6e841963c