Php 打印多维数组

我用PHP编写了以下代码：

$rules = array(
    "s0" => array(
        "a" => "s1_s2_s3",
        "b" => "s2_s3"    
    ),
    "s1_s2" => array(
        "a" => "s1_s2",
        "b" => "s2_s3"
    ),
);

要这样打印它：

s0 -- a --- s1_s2_s3
s0 -- b --- s2_s3
s1_s2 -- a --- s1_s2
s1_s2 -- b --- s2_s3

我该怎么做？

这就是你该怎么做：

$rules = array(
    "s0"  => array(
        "a" => "s1_s2_s3",
        "b" => "s2_s3"
    ),
    "s1_s2" => array(
        "a" => "s1_s2",
        "b" => "s2_s3"
    ),
);


foreach ($rules as $key => $args) {
    foreach ($args as $key2 => $vals) {
        print $key . ' -- ' . $key2 . ' --- ' . $vals . '<br>';
    }
}

要在索引处添加或更新数组，请执行以下操作：

$rules['another']['c'] = 'change c value';

---

要实现这一点，必须遍历数组。为此，需要一个循环，在PHP中，有一个函数

foreach

。这是一个例子-

给定数组：

$rules = array("s0" => array("a" => "s1_s2_s3",
                              "b" => "s2_s3"    
                              ),
               "s1_s2" => array("a" => "s1_s2",
                                "b" => "s2_s3"
                               )
                );

foreach ($rules as $key => $value) {
    foreach ($value as $sub_key => $sub_val) {
        echo "<p>".$key." -- ".$sub_key." --- ".$sub_val."</p>";
    }
}

s0 -- a --- s1_s2_s3
s0 -- b --- s2_s3
s1_s2 -- a --- s1_s2
s1_s2 -- b --- s2_s3

---

谢谢，我和你一样，但我忘了“价值”：）谢谢，我和你一样，但我忘了“价值”：）如果它对你有效，请把我的答案标记为正确的：-）和一个简单的问题。是任何数组函数，我如何用这三个“元素”添加新的数组值？比如数组推送？我可以用变量吗？例如：array_push（$rules，[$state1=>[$alphabet=>$state2]]）；是的，你可以。您应该仔细阅读数组、数据结构和变量。你付出的努力是惊人的。

s0 -- a --- s1_s2_s3
s0 -- b --- s2_s3
s1_s2 -- a --- s1_s2
s1_s2 -- b --- s2_s3