Day 40 (PHP)

1.阵列抓值

(1)打开$person的'programs'(key) 抓 $language(vaule)

     <?php     $person['name'] = 'Brad';     $person['age'] = 18;     $person['weight'] = 80;     $person['programs'] = ['PHP', 'Java', 'C', 'Swift'];     foreach ($person['programs'] as $language) {         echo "{$language}<br />";     }

(2)$p 抓 $key(key) 及 $value(vaule)

     foreach ($p as $key => $value) {         echo "{$key}点出现{$value}次<br />";     }

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2. 网页内的所有key及vaule，环境变数: $ _ SERVER

想知道这是甚么，可以跑这个迴圈慢慢拆(可以把Array都打开)

   foreach ($_SERVER as $key => $value) {    //有array继续打开    if (gettype($value) == 'array') {        echo "{$key} => ";        foreach ($value as $kk => $vv) {            echo "{$kk} : {$vv}<br />";        }        echo "===<br />";    } else {        echo "{$key} : {$value}<br />";    }}

$ _ 还有很多变数可以用ex:$_GET、$_COOKIE...

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3.函数

(1)看全部有几个? echo func_num_args()

    sayHelloV4('Brad', 'Eric', 'Amy');    function sayHelloV4()    {           echo func_num_args()  //3    }

(2)第几个是谁? echo func_get_arg(0)

    function sayHelloV4()    {            echo func_get_arg(0);  //Brad         echo func_get_arg(1);  //Eric         echo func_get_arg(2);  //Amy    }

(3)看全部，使用foreach

    $args = func_get_args();    function sayHelloV4()    {           foreach ($args as $name) {        echo "Hello, {$name}<br />";        }    }

(4)与var_dump 的差异

    function sayHelloV4()    {           var_dump($args);    }    //array(3) { [0]=> string(4)     //"Brad" [1]=> string(4) "Eric" [2]=> string(3)    // "Amy" } Hello, Brad

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4.PHP字串的Function - strpos 找字串位置

https://www.php.net/manual/en/ref.strings.php

    $mystr = 'abcdefg';    $findme = 'd';    if (strpos($mystr, $findme) !== false) {       // !== false 全不等                                                   //(TURE，非0、NULL...)        echo "find: " . strpos($mystr, $findme);   //.字串相加    } else {        echo "not found";    }

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5.强制进IF判断的方法

!== false
全不等于，才不会进来判断

    if (strpos($mystr, $findme) !== false) {             echo "{$mystr}.{$findme}<br>";        echo "find: " . strpos($mystr, $findme);  //.字串相加    } else {        echo "not found";    }

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6.PHP字串的Function

strlen 取得长度
https://www.php.net/manual/en/function.strlen.phpsubstr - Return part of a string
https://www.php.net/manual/en/function.substr.php

    if (strlen($id) == 10) {            //长度=10        if (strpos('ABCDEFGHIJKLMNOPQRSTUVWXYZ',substr($id, 0, 1)) !== false)        // strpos $id第一码(substr)的字在字串的第几个位置(回传int)        // substr 从0开始 , 第一码         // 如果!== false(0)        // 输出OK        {            echo 'ok';        } else {            echo 'X2';        }    } else {        echo 'X1';    }

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7.PHP - 正规表示法 - preg_match

https://www.php.net/manual/en/function.preg-match
https://zh.wikipedia.org/wiki/%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F

        $id = 'A123456789';        $regex = '/^[A-Z][12][0-9]{8}$/';  //[12]1或2 {8}8码                // $id 是否符合 $regex         if (preg_match($regex, $id)) {            echo 'OK';        } else {            echo 'XX';        }

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8.引用PHP已经写好的函式include

        include "bradapis.php";        include "myphp/bradapis.php";  //可以从不同资料夹

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9.写程式逻辑:

举例:身分证号码随机产生
4.的限制最多，所以以他为依归，其他1.2.3.例子引用4.
这样就只维护4.就行了~

1.乱数

    function createTWIdByRandom()    {        $gender = rand(0, 1) == 0;        return createTWIdByGender($gender);    }

2.指定性别

    function createTWIdByGender($gender = false)    {        $letters = 'ABCDEFGHJKLMNPQRSTUVXYWZIO';        $area = substr($letters, rand(0, 25), 1);        return createTWIdByBoth($gender, $area);    }

3.指定地区

    function createTWIdByArea($area = 'B')    {        $gender = rand(0, 1) == 0;        return createTWIdByBoth($gender, $area);    }

4.性别跟地区都指定

    function createTWIdByBoth($gender, $area)    {    }

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10.PHP送资料用submit 非button

    <input type="submit" value="Register" />

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11.$_REQUEST 与 $_GET 与 $_POST 差异

    $_GET 只收 method="get"     密码显示浏览器，好处:开发看的到    $_POST 只收 method="post"   密码不显示    $_REQUEST 收 method="get" method="post" 

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12.File System 档案系统 API

https://www.php.net/manual/en/refs.fileprocess.file.php

用phpinfo();
检查自己PHP的File System有没有安装或是目前版本

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13.内部档案相关

opendir - 开启档案
https://www.php.net/manual/zh/function.opendir.php
readdir - 读取档案(只读同一层)
https://www.php.net/manual/zh/function.readdir.php

closedir - 关闭档案
https://www.php.net/manual/zh/function.closedir

exit - 读不到档案会显示
https://www.php.net/manual/zh/function.exit

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14.while()内，只能丢一个bolling值(0、1、TURE、FALES)

    while ($row = readdir($fp)) {       }