"; $name = "iwanghang"; $sex = "man"; $_POST['a'] = 100; // The 9 underlined variables are already global variables by default, no need for global"/> "; $name = "iwanghang"; $sex = "man"; $_POST['a'] = 100; // The 9 underlined variables are already global variables by default, no need for global">

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PHP开发(16)-global-static-func_get_args-sort-PhpStorm

黄舟
黄舟Original
2017-03-03 09:10:331069browse

PHP Development (16)-global-static-func_get_args-sort-PhpStorm


<?php
    /**
     * 全局变量和局部变量
     * global 全局
     */
    echo "---------- global Demo ----------<br>";
    $name = "iwanghang";
    $sex = "man";
    $_POST[&#39;a&#39;] = 100; // 带下划线的9个默认就已经是全局变量,不需要global
    static $age = 8;
    person();

    function person(){
        global $name;
        echo $name; // 打印结果:iwanghang
        echo $sex; // 会报错
        echo $_POST[&#39;a&#39;]; // 打印结果:100
        echo "<br>";
    }

    /**
     * 静态变量
     * static 静态
     */
    echo "---------- static Demo ----------<br>";
    class A{
        public static $b = 0;
    }

    $c = new A();
    echo A::$b++; // 打印结果:0
    echo "<br>";
    echo A::$b; // 打印结果:1
    echo "<br>";
    $d = new A();
    echo A::$b; // 打印结果:1
    echo "<br>";

    /**
     *  function Demo 1
     */
    echo &#39;---------- function Demo 1 :function add($x,$y){} ----------<br>&#39;;
    echo add(10,10)."<br>"; // 打印结果:20
    echo add(20,20)."<br>"; // 打印结果:40
    function add($x,$y){
        return $x+$y;
    }

    /**
     * function Demo 2
     */
    echo &#39;---------- function Demo 2 : function demo(&$yy){} ----------<br>&#39;;
    $xx = 20;
    function demo(&$yy){
        $yy = 100;
    }
    echo $xx."<br>";
    demo($xx);
    echo $xx."<br>";

    /**
     * function Demo 3
     */
    echo &#39;---------- function Demo 3 : function demo2($number1 = 0, $number2 = 0, $number3 = 0, $number4 = 0){} ----------<br>&#39;;
    demo2();
    demo2(1,2,3,4);
    demo2(1,2);
    demo2(null,null,1,2);
    function demo2($number1 = 0, $number2 = 0, $number3 = 0, $number4 = 0){
        echo "$number1 , $number2 , $number3 , $number4<br>";
    }

    /**
     * function Demo 4
     * func_get_args() 返回一个数组,包含所有参数
     * func_num_args() 返回参数总数
     * func_get_arg() 接受一个数字参数,返回指定参数
     */
    echo &#39;---------- function Demo 4 :func_get_args() ----------<br>&#39;;
    echo demo3(10,20,30,40,50)."<br>";
    echo demo3(1,2,3,4,5)."<br>";
    function demo3(){
        $arr = func_get_args();
        $sum = 0;
        for ($i=0; $i<count($arr); $i++){
            $sum += $arr[$i];
        }
        return $sum;
    }

    /**
     * function Demo 5
     * var
     */
    echo &#39;---------- function Demo 5 :var ----------<br>&#39;;
    $var = "add";
    echo $var(10,20);
    echo "<br>";
    function add2($m,$n){
        return $m + $n;
    }

    /**
     *  print_r 打印出复杂类型变量的值(如数组,对象)
     *  sort 对数组中的元素按字母进行升序排序
     */
    echo &#39;---------- print_r 打印数组 、 sort 升序排序 ----------<br>&#39;;
    $arr2 = array(3,5,1,2,13,8);
    print_r($arr2); // Array ( [0] => 3 [1] => 5 [2] => 1 [3] => 2 [4] => 13 [5] => 8 )
    echo "<br>";
    sort($arr2);
    print_r($arr2); // Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 5 [4] => 8 [5] => 13 )
    echo "<br>";

    /**
     * 练习 打印2到32的偶数 其中3的倍数不打印
     */
    echo &#39;---------- function Demo 6 :打印2到32的偶数 其中3的倍数不打印 ----------<br>&#39;;
    demo4(2,32);
    function demo4($start, $num){
        for ($i=$start;$i<$num;$i+=2){
            if ($i%3==0){
                continue;
            }
            echo $i."<br>";
        }
    }

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