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<!DOCTYPE html> <html> <body> <?php $a = "Hello world!"; echo "The value of variable 'a' before unset: " . $a . "<br>"; unset($a); echo "The value of variable 'a' after unset: " . $a; ?> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>
The value of variable 'a' before unset: Hello world!
The value of variable 'a' after unset: