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<!DOCTYPE html>
<html>
<body>
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<h1>The ! Operator</h1>
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<p>Write a message if the condition is NOT true.</p>
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<?php
$x = 100;  
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if (!($x == 90)) {
    echo "Hello world!";
}
?>  
​
</body>
</html>
​

The ! Operator

Write a message if the condition is NOT true.

Hello world!