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For more info you may wanna check out the PHP Manual at <a href="http://www.php.net" rel="ugc">www.php.net</a><br />
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;)
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For more info you may wanna check out the PHP Manual at www.php.net [http://www.php.net]

;)

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! is just the negation of something you could get as a boolean result, for example isset() return a boolean type, if you use !isset() you are just asking for the false option of that boolean variable...<br />
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;) 
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! is just the negation of something you could get as a boolean result, for example isset() return a boolean type, if you use !isset() you are just asking for the false option of that boolean variable...

;)

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<a href="http://stefan.cuencaweb.com/thanx.htm" rel="ugc">http://stefan.cuencaweb.com/thanx.htm</a>
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http://stefan.cuencaweb.com/thanx.htm [http://stefan.cuencaweb.com/thanx.htm]

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I want a real good explantion of isset and ! can anyone give a written explantion on them and when and how to use them and a small commented example.
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I want a real good explantion of isset and ! can anyone give a written explantion on them and when and how to use them and a small commented example.

Explain how to use  (isset) and   (!) and a example

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.