为什么我的指针功能不起作用

Question

这是一个愚蠢的问题，但我无法弄清楚为什么我的指针功能不起作用。为什么他们不工作？

$r = array("boo", "goo", "buzz");

while($r = current($r))
{
 echo $r . '<br />';
 next($r);
}

Answer 1

在while上删除该作业：

示例：

$r = array("boo", "goo", "buzz");
while(current($r)) { // get current until true so it will loop, dont assign, you will overwrite r (the array), you could assign a new variable name instead, then use that new name to echo
    echo current($r) . '<br />'; // echo current pointer, not the whole array
    next($r); // shift to next pointer
}

或

$r = array("boo", "goo", "buzz");
while($a = current($r)) { // now you can assign, you won't overwrite `$r`
    echo $a . '<br />';
    next($r); // move to next pointer in r
}

Answer 2

试试这种方式。

$r = array("boo", "goo", "buzz");

while(list($var, $val) = each($r))
{

 echo $val . '<br />';


}