PHP each() 函数

实例

返回当前元素的键名和键值，并将内部指针向后移动：

<?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); print_r (each($people)); ?>

定义和用法

each() 函数返回当前元素的键名和键值，并将内部指针向后移动。

该元素的键名和键值返回到带有四个元素的数组中。两个元素（1 和 Value）包含键值，两个元素（0 和 Key）包含键名。

语法

each(array)

参数	描述
array	必需。规定要使用的数组。

技术细节

返回值：	返回当前元素的键名和键值。该元素的键名和键值返回到带有四个元素的数组中。两个元素（1 和 Value）包含键值，两个元素（0 和 Key）包含键名。如果没有更多的数组元素，则函数返回 FALSE。
PHP 版本：	4+

实例 1

与页面顶部的实例相同，但是本例通过循环输出整个数组：

<?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); reset($people); while (list($key, $val) = each($people)) { echo "$key => $val "; } ?>

实例 2

所有相关方法的演示：

<?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); echo current($people) . " "; // The current element is Peter echo next($people) . " "; // The next element of Peter is Joe echo current($people) . " "; // Now the current element is Joe echo prev($people) . " "; // The previous element of Joe is Peter echo end($people) . " "; // The last element is Cleveland echo prev($people) . " "; // The previous element of Cleveland is Glenn echo current($people) . " "; // Now the current element is Glenn echo reset($people) . " "; // Moves the internal pointer to the first element of the array, which is Peter echo next($people) . " "; // The next element of Peter is Joe print_r (each($people)); // Returns the key and value of the current element (now Joe), and moves the internal pointer forward ?>

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