Can someone please help me with few definition

[xxreenaxx1]

if(isset($_GET[source])) {
    highlight_file(__FILE__);
}else{

 

 

what does this mean. i know its something to do with file..

[Mchl]

http://www.php.net/manual/en/function.isset.php

http://www.php.net/manual/en/reserved.variables.get.php

http://www.php.net/manual/en/function.highlight-file.php

http://www.php.net/manual/en/language.constants.predefined.php

 

If the url variable 'source' is set display the source if current file

[Andy-H]

if(isset($_GET[source])) {
    highlight_file(__FILE__);
}else{

 

 

what does this mean. i know its something to do with file..

 

Also associative array keys should be quoted as strings.

 

$_GET['source'];