PHP:for循环中变量的增量名称 [英] PHP: increment name of variable in a for loop

问题描述

for循环失败，因为"$"是无效的可变字符:

The for loop fails because "$" is an invalid variable character:

<?php 
$num1 = "Number 1";
$num2 = "Number 2";
$num3 = "Number 3";

for ($i = 0; $i < 3; $i++) {
    echo $num$i . "<br>";
}
?>

(我不理解这个问题)

推荐答案

$num1 = "Number 1";
$num2 = "Number 2";
$num3 = "Number 3";

for ($i = 1; $i <=3; $i++) {
    $num = 'num' . $i;
    echo ${$num} . "<br>";
}

但是使用数组更简单:

$nums = array("Number 1", "Number 2","Number 3");
for ($i = 0; $i <3; $i++) {
    echo $nums[$i] . "<br>";
}

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