foreach 语句用于循环遍历数组.每进行一次循环,当前数组元素的值就会被赋值给 value 变量(数组指针会逐一地移动) – 以此类推,语法如下:
- foreach (array as value)
- {
- code to be executed;
- }
下面的例子示范了一个循环,这个循环可以输出给定数组的值:
- <html>
- <body>
- <?php
- $arr=array("one", "two", "three");
- foreach ($arr as $value)
- {
- echo "value: " . $value . "<br />";
- }
- ?>
- </body>
- </html>
下面详细看一下详细说明:
- foreach ($array as &$row) {
- $row = explode('/', $row);
- }
- foreach ($array as $row) {
- //do something
- }
这么写,在第二个循环会出逻辑错误,加入第二个循环中do something的地方是输出$row,循环到最后一个的时候的输出是倒数第二个元素,而不是最后一个,要这么写:
- foreach ($array as &$row) {
- $row = explode('/', $row);
- }
- unset($row);
- foreach ($array as $row) {
- //do something
- }
或者第一个循环这么写,代码如下:
- foreach ($array as $key => $row) {
- $array[$key] = explode('/', $row);
- }
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波比源码 » php foreach 循环遍历数组方法
波比源码 » php foreach 循环遍历数组方法
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