foreach()有两种用法：
foreach(array_name as $value) { statement; }
这里的array_name是你要遍历的数组名，每次循环中，array_name数组的当前元素的值被赋给$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。
foreach(array_name as $key => $value) { statement; }
这里跟第一种方法的区别就是多了个$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.
程序实例：
1
// 运行结果foreach example 1: value only current value of $a: 1current value of $a: 2current value of $a: 3current value of $a: 17
2
/*-------------------------------------------------------------------------*//* foreach example 2: value (with key printed for illustration) */echo '
'.'
'.foreach example 2: value (with key printed for illustration) .'
';$a = array(1, 2, 3, 17);$i = 0; /* for illustrative purposes only */foreach ($a as $v) { echo $a[$i] => $v.'
'; $i++;}// 程序运行结果foreach example 2: value (with key printed for illustration) $a[0] => 1$a[1] => 2$a[2] => 3$a[3] => 17
3
/*-------------------------------------------------------------------------*//* foreach example 3: key and value */echo '
'.'
'.foreach example 3: key and value .'
';$a = array( one => 1, two => 2, three => 3, seventeen => 17);foreach ($a as $k => $v) { echo $a[$k] => $v.'
';}// 程序运行结果foreach example 3: key and value $a[one] => 1$a[two] => 2$a[three] => 3$a[seventeen] => 17
4
/*-------------------------------------------------------------------------*//* foreach example 4: multi-dimensional arrays */echo '
'.'
'.foreach example 4: multi-dimensional arrays .'
';$a = array();$a[0][0] = a;$a[0][1] = b;$a[1][0] = y;$a[1][1] = z;foreach ($a as $v1) { foreach ($v1 as $v2) { echo $v2n; }}// 程序运行结果foreach example 4: multi-dimensional arrays a b y z
5
/*-------------------------------------------------------------------------*//* foreach example 5: dynamic arrays */echo '
'.'
'.foreach example 5: dynamic arrays .'
';foreach (array(1, 2, 3, 4, 5) as $v) { echo $vn;}// 程序运行结果foreach example 5: dynamic arrays 1 2 3 4 5
也可以这么用：
$messagenav['首页'] =root_path;$messagenav['人才交流'] =#$messagenav['动态专栏'] =hragent/cn/$value):?>>
http://www.bkjia.com/phpjc/752574.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/752574.htmltecharticleforeach()有两种用法： foreach(array_name as $value) { 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...