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PHP开发(17)-callback-readdir-is_dir-foreach-glob-PhpStorm

黄舟
Release: 2023-03-06 10:12:02
Original
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PHP Development (17)-callback-readdir-is_dir-foreach-glob-PhpStorm



##

<?php
    /**
     * callback 回调函数
     */
    echo "---------- callback Demo 1 ----------<br>";
    call_user_func_array("fun",array(123,321)); // 打印结果:123 , 321 , 3
    call_user_func_array("fun",array(123,321,444,555)); // 打印结果:123 , 321 , 444

    function fun($one="1", $two="2", $three="3"){
        echo "$one , $two , $three<br>";
    }

    /**
     * 排除回文数
     * 回文数:N位数中,第1个数字和最后N个数字相同
     * strrev 反转字符串
     */
    echo "---------- callback Demo 2 ----------<br>";
    demo(25,"test"); // 打印结果:10 12 13 14 15 16 17 18 19 20 21 23 24
                    // 也就是没有打印回文数:0 1 2 3 4 5 6 7 8 9 11 22
    echo "<br>";

    function demo($num, $n){
        for ($i=0; $i<$num ; $i++){
            if (call_user_func_array($n,array($i)))
                continue;
            echo $i."    ";
        }
    }
    function test($i){
        if ($i==strrev($i))
            return true;
        else
            return false;
    }

    /**
     *
     */
    echo "---------- callback Demo 3 ----------<br>";
    //$filter = new Filter(); // 实例化Filter
    //$filter->one(1); // 调用Filter类里面的one函数
    //Filter::two(1); // 调用Filter类里面的two静态函数

    // 函数one 排除3的整数倍
    demo(25,array(new Filter(),"one")); // 打印结果:1 2 4 5 7 8 10 11 13 14 16 17 19 20 22 23
    echo "<br>";
    // 静态函数two 排除所有包含字符串3的数字
    demo(25,array("Filter","two")); // 打印结果:0 1 2 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 21 22 24
    echo "<br>";

    class Filter{
        function one($i)
        {
            if ($i % 3 == 0) {
                return true;
            } else {
                return false;
            }
        }
        static function two($i){
            if (preg_match(&#39;/3/&#39;,$i)){
                return true;
            }else{
                return false;
            }
        }
    }

    /**
     * 测试文件夹命令,随便找一个程序的安装目录拷贝到项目下
     * 遍历指定目录下所有目录和文件
     * readdir() 函数返回目录中下一个文件的文件名
     * is_dir() 判断给定文件名是否是一个目录
     * readdir 打印结果: .  当前目录
     * readdir 打印结果: ..  上一级目录
     */
    echo "---------- opendir ----------<br>";
    $dirname = "./demoFile2";
    // 打开目录资源
    $dir = opendir($dirname);
    // 读取文件
    echo readdir($dir).&#39;<br>&#39;;
    echo readdir($dir).&#39;<br>&#39;;
    echo readdir($dir).&#39;<br>&#39;;
    while ($file = readdir($dir)){
        $file = $dirname."/".$file;
        if (is_dir($file)){
            echo "目录:";
        }else{
            echo "文件:";
        }
        echo $file.&#39;<br>&#39;;
    }
    // 关闭目录资源
    closedir($dir);

    /**
     * 测试文件夹命令,随便找一个程序的安装目录拷贝到项目下
     * 遍历指定目录下所有目录和文件(包含子目录)
     * glob 返回匹配指定模式的文件名或目录
     * glob 返回一个包含有匹配文件 / 目录的数组
     * foreach 语法结构提供了遍历数组的简单方式
     * foreach (array_expression as $value) 每次循环中,当前单元的值被赋给 $value 并且数组内部的指针向前移一步
     * (因此下一次循环中将会得到下一个单元)
     */
    echo "---------- opendir2 ----------<br>";
    //fetchDir("demoFile1");
    function fetchDir($dir) {
        foreach(glob($dir.&#39;\*&#39;) as $file) {
            echo $file.&#39;<br>&#39;,"\n";
            if(is_dir($file)) {
                fetchDir($file);
            }
        }
    }

    fetchDir2("demoFile1");
    function fetchDir2($dir) {
        foreach(glob($dir.&#39;\*&#39;) as $file) {
            if(is_dir($file)) {
                echo "目录:".$file.&#39;<br>&#39;,"\n";
                fetchDir2($file);
            }else{
                echo "文件:".$file.&#39;<br>&#39;,"\n";
            }
        }
    }
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