如何将项目添加到一个数组，而通过它的循环？ [英] How to add items to an array while looping through it?

问题描述

在一个的foreach 循环，似乎PHP读取之初整个数组，所以如果你突然需要新的项目追加到数组他们不会得到处理由环路

On a foreach loop, it seems PHP reads the whole array at the beginning, so if you suddenly need to append new items to the array they won't get processed by the loop:

$a = array (1,2,3,4,5,6,7,8,9,10);

foreach ($a as $b)
    {
        echo " $b ";
        if ($b ==5) $a[] = 11;
    }

只打印出： 1 2 3 4 5 6 7 8 9 10

推荐答案

只要创建你的循环数组的参考副本

Just create a reference copy of the array you are looping

$a = array(1,2,3,4,5,6,7,8,9,10);
$t = &$a; //Copy
foreach ( $t as $b ) {
    echo " $b ";
    if ($b == 5)
        $t[] = 11;
}

或刚使用 ArrayIterator

$a = new ArrayIterator(array(1,2,3,4,5,6,7,8,9,10));
foreach ( $a as $b ) {
    echo "$b ";
    if ($b == 5)
        $a->append(11);
}

输出

 1 2 3 4 5 6 7 8 9 10 11

见现场演示

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