文章主要讲到关于php中慎用isset来判断数组是否存在key一些举例说明.
接上代码,不知道是php5.4版本的问题,还是本来就这样…
实例代码如下:
- $a['hello'] = ’123‘;
- $a['xx'] = NULL;
- var_dump(isset($a['hello'])); //bool(true)
- var_dump(isset($a['xx'])); //bool(false)
- # 应该使用这个来判断
- var_dump(array_key_exists(‘xx’, $a)); //bool(true)
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波比源码 » php中慎用isset来判断数组是否存在key
波比源码 » php中慎用isset来判断数组是否存在key
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