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PHP中删除变量时unset()和null的区别分析 - 站长搜索
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PHP中删除变量时unset()和null的区别分析

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2014-12-06 05:24:04 转载来源: 网络整理/侵权必删

本文为大家讲解的是PHP中删除变量时unset()和null的区别分析,感兴趣的同学参考下。 当程序里不再使用某些大体积的变量时(如:数组或对象),我们有必要删除它们 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

本文为大家讲解的是PHP删除变量unset()和null区别分析,感兴趣的同学参考下。

当程序里不再使用某些大体积的变量时(如:数组或对象),我们有必要删除它们
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:


<?php
$a = array(
'a' => 'a',
'b' => 'b'
);
$b = array(
'a' => 'a',
'b' => 'b'
);
$a['b'] = null;
unset($b['b']);
print('<pre>');
print_r($a);
print('<br />');
print_r($b);
print('</pre>');
?>


结果:


Array
(
[a] => a
[b] =>
)
Array
(
[a] => a
)

 


标签: PHP 删除 变量 unset null 区别 分析


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