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1 - 递归地计算数组(计算多维数组的所有元素)。 例子:此示例说明了 PHP 中 sizeof() 方法的基本用法。 PHP <?php$arr =array("Java"=>array("SpringBoot","Eclipse") ,"Python"=>array("Django") ,"PHP"=>array("CodeIgniter") ); print_r($arr);print("");echo"Sub elements of an array: "...