Android程序员学PHP开发(20)-数组(2)多维数组和实际应用-PhpStorm

顺亿

2026-09-26 • 👁 0人浏览过

在php开发中，有很大部分比例，我们是在操作数组，所以数组的学习非常关键~~

"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"),  // $group[0]
        array("name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"), // $group[1]
        array("name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"), // $group[2]
        "four"=>array("name"=>"xiaoming", "age"=>8, "sex"=>"男", "email"=>"xiaoming@qq.com")
    );
    var_dump($group[1]); // 打印结果 ： array(4) { ["name"]=> string(5) "queen" ["age"]=> int(14)
                         // ["sex"]=> string(3) "女" ["email"]=> string(12) "queen@qq.com" }
    echo "
";
    var_dump($group[1]["name"]); // 打印结果 ： string(5) "queen"
    echo "
";
    var_dump($group[2]["age"]); // 打印结果 ： int(55)
    echo "
";
    var_dump($group["four"]["email"]); // 打印结果 ： string(15) "xiaoming@qq.com"
    echo "
";

[
                    ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"],  // $group[0]
                    ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
                    ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
                ],
                [
                    ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"],  // $group[0]
                    ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
                    ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
                ],
                [
                    ["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"],  // $group[0]
                    ["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
                    ["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
                ]
    ];
    echo '

';
    $arr = ["one", "two", "three", "four"];

    echo '---------- isset($arr[2]) ----------
';
    if (isset($arr[2])){ // 打印结果：存在
        echo "存在";
    }else{
        echo "不存在";
    }
    echo "
";

    echo '---------- print_r($arr) ----------
';
    print_r($arr); // 打印结果：Array ( [0] => one [1] => two [2] => three [3] => four )
    echo "
";

    echo '---------- unset($arr[2]) ----------
';
    unset($arr[2]);
    if (isset($arr[2])){ // 打印结果：不存在
    echo "存在";
    }else{
        echo "不存在";
    }
    echo "
";

    echo '---------- print_r($arr) ----------
';
    print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four )
    echo "
";

    echo '---------- $arr[2] = null ----------
';
    $arr[2] = null;
    if (isset($arr[2])){ // 打印结果：不存在
        echo "存在";
    }else{
        echo "不存在";
    }
    echo "
";

    echo '---------- print_r($arr) ----------
';
    print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four [2] => )
    echo "
";

1){
            if ($i % $n == 0){
                echo $i."除以".$n."余数为0,所以删除".$arr[$i]."
";
                unset($arr[$i]);
            }else{
                $arr[] = $arr[$i];
                print_r($arr);
                echo "
";
                unset($arr[$i]);
            }
            $i++;
        }

        print_r($arr);
    }

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