Syntax
1.<?2.isset($var);3.?>Sample
01.<?php02.$var1 = null;03.$var2 = "";04.$var3 = "ThaiCreate.Com";05. 06.echo "\$var1 = ".isset($var1)."<br>";07.echo "\$var2 = ".isset($var2)."<br>";08.echo "\$var3 = ".isset($var3)."<br>";09.echo "\$var4 = ".isset($var4)."<br>";10.?>
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