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