第一种方法：$varname=null
第二种方法：unset($varname)
这两种方法都可以删除变量，但结果有些许的差别。
代码：
复制代码 代码如下:
$a = array(
'a' => 'a',
'b' => 'b'
);
$b = array(
'a' => 'a',
'b' => 'b'
);
$a['b'] = null;
unset($b['b']);
print('
'); <br>print_r($a); <br>print('<br>'); <br>print_r($b); <br>print('复制代码 代码如下:
Array
(
[a] => a
[b] =>
)
Array
(
[a] => a
)
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