PHP next() 函数
实例
输出数组中的当前元素和下一个元素的值：
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo current($people) . "<br>";
echo next($people);
?>
亲自试一试 »
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo current($people) . "<br>";
echo next($people);
?>
定义和用法
next() 函数将内部指针指向数组中的下一个元素，并输出。
相关的方法：
- prev() - 将内部指针指向数组中的上一个元素，并输出
- current() - 返回数组中的当前元素的值
- end() - 将内部指针指向数组中的最后一个元素，并输出
- reset() - 将内部指针指向数组中的第一个元素，并输出
- each() - 返回当前元素的键名和键值，并将内部指针向前移动
语法
next(array)
参数值
| 参数 | 描述 |
|---|---|
| array | 必需。规定要使用的数组。 |
说明
next() 和 current() 的行为类似，只有一点区别，在返回值之前将内部指针向前移动一位。这意味着它返回的是下一个数组单元的值并将数组指针向前移动了一位。如果移动指针的结果超出了数组单元的末端，则 next() 返回 FALSE。
注意：如果数组包含空的单元，或者单元的值是 0 则该函数碰到这些单元也返回 FALSE。要正确遍历可能含有空单元或者单元值为 0 的数组，请参见 each() 函数。
技术细节
| 返回值: | 如果成功则返回数组中下一个元素的值，如果没有更多的数组元素则返回 FALSE。 |
|---|---|
| PHP 版本: | 4+ |
更多实例
实例
演示所有相关的方法：
<?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
?>
亲自试一试 »
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo current($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
?>
