Heim  >  Artikel  >  Backend-Entwicklung  >  Android-Programmierer lernen PHP-Entwicklung (20) – Arrays (2) Mehrdimensionale Arrays und praktische Anwendungen – PHPStorm

Android-Programmierer lernen PHP-Entwicklung (20) – Arrays (2) Mehrdimensionale Arrays und praktische Anwendungen – PHPStorm

黄舟
黄舟Original
2017-03-03 09:30:241132Durchsuche

In der PHP-Entwicklung arbeitet ein großer Teil von uns mit Arrays, daher ist das Erlernen von Arrays sehr wichtig~~

<?php
    /**
     * 二维数组
     */
    $group = array(
        array("name"=>"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 "<br>";
    var_dump($group[1]["name"]); // 打印结果 : string(5) "queen"
    echo "<br>";
    var_dump($group[2]["age"]); // 打印结果 : int(55)
    echo "<br>";
    var_dump($group["four"]["email"]); // 打印结果 : string(15) "xiaoming@qq.com"
    echo "<br>";


<?php
/**
 * 多维数组
 */
    $class = [
                "group1"=>[
                    ["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 &#39;<pre class="brush:php;toolbar:false">&#39;;
    echo &#39;---------- $class ----------<br>&#39;;
    print_r($class);
    echo &#39;---------- $class[0] ----------<br>&#39;;
    print_r($class[0]);
    echo &#39;---------- $class[0][0] ----------<br>&#39;;
    print_r($class[0][0]);
    echo &#39;---------- $class[0][0][\&#39;name\&#39;] ----------<br>&#39;;
    print_r($class[0][0][&#39;name&#39;]);
    echo &#39;<br>----------- $class["group1"][0][\&#39;name\&#39;]) -----------<br>&#39;;
    print_r($class["group1"][0][&#39;name&#39;]);

    /**
     * 打印结果:
            ---------- $class ----------
            Array
            (
                [group1] => Array
                    (
                        [0] => Array
                            (
                                [name] => iwanghang
                                [age] => 18
                                [sex] => 男
                                [email] => iwanghang@qq.com
                            )

                        [1] => Array
                            (
                                [name] => queen
                                [age] => 14
                                [sex] => 女
                                [email] => queen@qq.com
                            )

                        [2] => Array
                            (
                                [name] => king
                                [age] => 55
                                [sex] => 男
                                [email] => king@qq.com
                            )

                    )

                [0] => Array
                    (
                        [0] => Array
                            (
                                [name] => iwanghang
                                [age] => 18
                                [sex] => 男
                                [email] => iwanghang@qq.com
                            )

                        [1] => Array
                            (
                                [name] => queen
                                [age] => 14
                                [sex] => 女
                                [email] => queen@qq.com
                            )

                        [2] => Array
                            (
                                [name] => king
                                [age] => 55
                                [sex] => 男
                                [email] => king@qq.com
                            )

                    )

                [1] => Array
                    (
                        [0] => Array
                            (
                                [name] => iwanghang
                                [age] => 18
                                [sex] => 男
                                [email] => iwanghang@qq.com
                            )

                        [1] => Array
                            (
                                [name] => queen
                                [age] => 14
                                [sex] => 女
                                [email] => queen@qq.com
                            )

                        [2] => Array
                            (
                                [name] => king
                                [age] => 55
                                [sex] => 男
                                [email] => king@qq.com
                            )

                    )

            )
            ---------- $class[0] ----------
            Array
            (
                [0] => Array
                    (
                        [name] => iwanghang
                        [age] => 18
                        [sex] => 男
                        [email] => iwanghang@qq.com
                    )

                [1] => Array
                    (
                        [name] => queen
                        [age] => 14
                        [sex] => 女
                        [email] => queen@qq.com
                    )

                [2] => Array
                    (
                        [name] => king
                        [age] => 55
                        [sex] => 男
                        [email] => king@qq.com
                    )

            )
            ---------- $class[0][0] ----------
            Array
            (
                [name] => iwanghang
                [age] => 18
                [sex] => 男
                [email] => iwanghang@qq.com
            )
            ---------- $class[0][0][&#39;name&#39;] ----------
            iwanghang
            ----------- $class["group1"][0][&#39;name&#39;]) -----------
            iwanghang
     */


<?php
    /**
     * 销毁指定下标Demo
     * isset 检测变量是否存在
     * unset 销毁指定的变量
     */
    echo &#39;---------- $arr = ["one", "two", "three". "four"]; ----------<br>&#39;;
    $arr = ["one", "two", "three", "four"];

    echo &#39;---------- isset($arr[2]) ----------<br>&#39;;
    if (isset($arr[2])){ // 打印结果:存在
        echo "存在";
    }else{
        echo "不存在";
    }
    echo "<br>";

    echo &#39;---------- print_r($arr) ----------<br>&#39;;
    print_r($arr); // 打印结果:Array ( [0] => one [1] => two [2] => three [3] => four )
    echo "<br>";

    echo &#39;---------- unset($arr[2]) ----------<br>&#39;;
    unset($arr[2]);
    if (isset($arr[2])){ // 打印结果:不存在
    echo "存在";
    }else{
        echo "不存在";
    }
    echo "<br>";

    echo &#39;---------- print_r($arr) ----------<br>&#39;;
    print_r($arr); // 打印结果:Array ( [0] => one [1] => two [3] => four )
    echo "<br>";

    echo &#39;---------- $arr[2] = null ----------<br>&#39;;
    $arr[2] = null;
    if (isset($arr[2])){ // 打印结果:不存在
        echo "存在";
    }else{
        echo "不存在";
    }
    echo "<br>";

    echo &#39;---------- print_r($arr) ----------<br>&#39;;
    print_r($arr); // 打印结果:Array ( [0] => one [1] => two [3] => four [2] => )
    echo "<br>";


<?php
    /**
     * 猴子选大王
     * xdw 选大王
     * count($arr) 数组下标
     */

    xdw(88,5); // 30只猴子,每3只出局1只

    function xdw($m, $n){
        $arr = array();

        $a = "a";

        for ($i=0; $i<$m; $i++){
            $arr[] = $a++;
        }

        print_r($arr);

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

        print_r($arr);
    }

So lernen Android-Programmierer die PHP-Entwicklung (20) - Array (2)Mehrdimensionale Arrays und praktische Anwendungen - PHPStorm-Inhalte. Weitere verwandte Inhalte finden Sie auf der chinesischen PHP-Website (www.php.cn)!



Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn