Php/func array reset
来自菜鸟教程
PHP reset()函数
例
输出数组中当前和下一个元素的值,然后将数组的内部指针重置为数组中的第一个元素:
<?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); echo current($people) . "<br>"; echo next($people) . "<br>"; echo reset($people); ?>
定义和用法
reset()函数将内部指针移动到数组的第一个元素。
相关方法:
- 当前() -返回数组中当前元素的值
- 结束() -将内部指针移至数组的最后一个元素并输出
- 下一个() -将内部指针移至数组中的下一个元素并输出
- prev() -将内部指针移动到数组中的前一个元素并输出
- 每() -返回当前元素的键和值,并向前移动内部指针
句法
reset(array)
参数值
参数 | 描述 |
---|---|
array | 需要。指定要使用的数组 |
技术细节
返回值: | 成功返回数组中第一个元素的值;如果数组为空,则返回FALSE |
PHP版本: | 4+ |
更多例子
例
所有相关方法的演示:
<?php $people = array("Peter", "Joe", "Glenn", "Cleveland"); echo current($people) . "<br>"; // The current element is Peter echo next($people) . "<br>"; // The next element of Peter is Joe echo current($people) . "<br>"; // Now the current element is Joe echo prev($people) . "<br>"; // The previous element of Joe is Peter echo end($people) . "<br>"; // The last element is Cleveland echo prev($people) . "<br>"; // The previous element of Cleveland is Glenn echo current($people) . "<br>"; // Now the current element is Glenn echo reset($people) . "<br>"; // Moves the internal pointer to the first element of the array, which is Peter echo next($people) . "<br>"; // 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 ?>