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Homephp教程PHP源码php怎么获取数组键名实例代码

在php中获取数组键名最简单的办法就是直接利用foreach遍历就可以直接输入key,value值了,下面我来给大家演示几个实例吧。

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我php foreach()函数可以遍历数组,取出数组的键值,怎么取键名$key?或只取第一个键名?比如下面的例子

 代码如下 复制代码

$keyarray = array(
'12020011' => '2b70e63ffdf',
'12020017' => '20767a021'
);

第一种方法,我可以用foreach 取出第一个键名.如下

 代码如下 复制代码

foreach($keyarray as $key => $value){
    $a[]=$key;
}
print_r ($a[0]);exit;

也可以用 print_r ($a);取出所有键名第二种方法是用array_keys()函数.

 代码如下 复制代码

$arrKeys = array_keys($keyarray);
print_r ($arrKeys[0]);exit;

上面有方法可以达到相同的效果.

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