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<?php
//定義遞歸函數(shù)
function printValues($arr) {
    global $count;
    global $items;
    
    //檢查$arr是否為數(shù)組
    if(!is_array($arr)){
        die("ERROR: Input is not an array");
    }
    
    /*
        遍歷數(shù)組，如果value本身是數(shù)組，則遞歸調(diào)用
        函數(shù)將找到的值添加到輸出項(xiàng)目數(shù)組中，
        并為找到的每個(gè)值將計(jì)數(shù)器加1
    */
    foreach($arr as $a){
        if(is_array($a)){
            printValues($a);
        } else{
            $items[] = $a;
            $count++;
        }
    }
    
    //返回?cái)?shù)組中的總計(jì)數(shù)和值
    return array('total' => $count, 'values' => $items);
}
 
//定義嵌套數(shù)組
$species = array(
    "birds" => array(
        "Eagle",
        "Parrot",
        "Swan"
    ),
    "mammals" => array(
        "Human",
        "cat" => array(
            "Lion",
            "Tiger",
            "Jaguar"
        ),
        "Elephant",
        "Monkey"
    ),
    "reptiles" => array(
        "snake" => array(
            "Cobra" => array(
                "King Cobra",
                "Egyptian cobra"
            ),
            "Viper",
            "Anaconda"
        ),
        "Crocodile",
        "Dinosaur" => array(
            "T-rex",
            "Alamosaurus"
        )
    )
);
 
//計(jì)算和打印嵌套數(shù)組中的值
$result = printValues($species);
echo $result['total'] . ' value(s) found: ';
echo implode(', ', $result['values']);
?>