如何判断变量是否为空？

Question

<?php
echo $Variable;
?>

**//  I would like to check if the variable is empty, using but if() statements but more secure     than...**
  if($var == "")

是否有可能检查变量是否比这更安全？

Answer 1

空()

Answer 2

if(!isset($var) || $var == "")
{
    //$var is empty.
}

^这就是我使用的东西,如果你还没有'初始化'它也会覆盖它.

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