从数组PHP获取所有以前的项目

Question

我有一个数组填充这些字符串,例如:

"1", "2", "3", "4", "5";

我有一个foreach()循环,循环这些项目.它输出所有项目.现在,它输出:

1, 2, 3, 4, 5

但我想输出这个:

1, 12, 123, 1234, 12345

我该怎么做呢？因为该prev()功能仅适用于当前项目之前的功能.

我的代码:

$array = array("1", "2", "3", "4", "5");
foreach ($array as $item){
    echo $item;
}

Answer 1

$include = "";
foreach($array as $item) {
    echo $include . $item;
    $include .= $item;
}

分隔符版本:

$string = "";
$include = "";
foreach($array as $item) {
    $string .= $include . $item . ", ";
    $include .= $item;
}
echo rtrim($string, ', \t\n');