PHP语言,未赋值的变量?
http://docs.php.net/manual/zh/language.types.null.php
问题:
1.
<br /><?php<br /> if ($x) <br /> echo "1";<br /> else<br /> echo "0";<br />?><br />
[email protected]:~$ php /var/www/b.php
PHP Notice: Undefined variable: x in /var/www/b.php on line 3
上面代码,第3行错了!
PHP语法,变量可以不赋值。
如果,变量不赋值,其值是:NULL。对么?
为什么编译,第3行出错呢?
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