Basic knowledge about php

1. Download an integrated environment software, that is, others put all the mess together and make it into software. This is SG style. I think it is better for beginners;
2. Each one Download and install .php.zend.apache; this method is the most confusing and I haven’t figured it out yet.
Since IIS is installed on the machine, I just installed php and zend. Now I can run php on the server at the same time. and asp.
php is embedded and run in html. As follows:
$a="Hello";
$b="php";
echo $a.$b;
?>
Note:
Use $variable name to define a variable, such as $a $b above. When referencing this variable, you must also use $variable name to reference it;
After each statement, add a ';' sign to indicate the end;
When outputting Use echo to output the content;
$a.$b; The '.' sign in this is used to connect two strings.
The running result of the above program is:
Hello, PHP!
Output the php information :
phpinfo();
?>
if statement in php:
$a=10;
$b=1;
if($a==$b){
              echo "a=b";
    }
?>
The output result is:
a=b
MD5 encryption function, anyone who has done the web knows md5, this is just a function in php, just call it :
$a="php";
$b=md5($a);
echo $b;
?>
The output result is:
e1bfd762321e409cee4ac0b6e841963c

The above introduces some basic knowledge about PHP, including some aspects. I hope it will be helpful to friends who are interested in PHP tutorials.