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[Midgard]

This topic is simple and advanced PHP codes including.
Please add your know codes.
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1. The Execution Operator

The excecution operator is really a pair of backticks (``) in fact. The backtick is not a single quote--it is usually located on the same key as the ~ (tilde) symbol on your keyboard.

PHP will attempt to execute whatever is contained between the backticks as a command at the command line of the server. The value of the expression is the output of the command.

For example, under UNIX-like operating system, you can use

$out = `ls -la`;
echo  "<pre>".$out."</pre>";

or, equivalently on a Windows server

$out = `dir c:`;
echo  "<pre>".$out."</pre>";

Either of these versions will obtain a directory listing and store it in $out. It can then be echoed to the browser or dealt with in any order way.