php中foreach()的用法
foreach()有两种用法:
1: foreach(array_name as $value)
{
statement;
}
{
statement;
}
这里的array_name是你要遍历的数组名,每次循环中,array_name数组的当前元素的值被赋给$value,并且数组内部的下标向下移一步,也就是下次循环回得到下一个元素。
2:foreach(array_name as $key => $value)
{
statement;
}
{
statement;
}
这里跟第一种方法的区别就是多了个$key,也就是除了把当前元素的值赋给$value外,当前元素的键值也会在每次循环中被赋给变量$key。键值可以是下标值,也可以是字符串。比如book[0]=1中的“0”,book[id]="001"中的“id”.
示范用法的更多例子:
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结果如下:
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Array
(
[0] => Array
(
[id] => 86
[name] => list_role
[title] => 角色列表
[pid] => 85
)
[1] => Array
(
[id] => 85
[name] => Index
[title] => 后台首页
[pid] => 83
)
[2] => Array
(
[id] => 83
[name] => Admin
[title] => 后台
[pid] => 0
)
)
foreach ($data as $v){}
Array
(
[id] => 86
[name] => list_role
[title] => 角色列表
[pid] => 85
)
Array
(
[id] => 85
[name] => Index
[title] => 后台首页
[pid] => 83
)
Array
(
[id] => 83
[name] => Admin
[title] => 后台
[pid] => 0
)
(
[id] => 86
[name] => list_role
[title] => 角色列表
[pid] => 85
)
Array
(
[id] => 85
[name] => Index
[title] => 后台首页
[pid] => 83
)
Array
(
[id] => 83
[name] => Admin
[title] => 后台
[pid] => 0
)