Beginner of php

1. Download an integrated environment software, that is, others put all the messes in one piece and make it into software. This is SG-style. I think it is better for beginners to use this;
2. Download and install them separately.; This method is the most messy and has not yet been clarified.

Because I have iis installed on the machine, I just installed php and zend. Now I can run php and asp on the server at the same time.

PHP is embedded in html. As follows:

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

illustrate:
Define a variable with the $ variable name, such as $a$b above. When referring to this variable, you should also use the $ variable name to reference;
After each statement is finished, a ';' number should be added to indicate the end;
When outputting, use echo to output content;
$a.$b;The '.' number in this is used to concatenate two strings.

The running result of the above program is:

Hello, PHP!

Output php information:

<?php
   phpinfo();
?>


If statement in php:

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

a=b

MD5 password function, anyone who has done the web knows md5, this is just a function in PHP, and it will be OK if you call it:

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

The output result is:

e1bfd762321e409cee4ac0b6e841963c