通过自己PHP编码实现var_dump()方法

我就是我 2022-03-02 18:46 97阅读 0赞

> 个人学习笔记

### 核心源码如下： ###

/**
     * 打印
     * @param array ...$params
     * @author klinson <klinson@163.com>
     */
    function info(...$params)
    {
        foreach ($params as $param) {
            info_item($param);
        }
    }
    
    /**
     * 打印单个变量
     * @param $param
     * @param int $i
     * @author klinson <klinson@163.com>
     */
    function info_item($param, $i = 0)
    {
        switch (gettype($param)) {
            case 'array':
                info_array($param, $i);
                break;
            case 'object':
                info_object($param, $i);
                break;
            case 'boolean':
                echo "bool(".($param ? "true" : "false").")";
                    break;
            case 'integer':
                echo "int({$param})";
                break;
            case 'string':
                echo "string({$param})";
                break;
            case 'double':
                echo  "float({$param})";
                break;
            case 'null':
                echo 'null';
                break;
            case 'resource':
                echo 'resource';
                break;
            default:
                echo 'UNKNOWN TYPE';
                break;
        }
        echo PHP_EOL;
    }
    
    /**
     * 打印数组
     * @param $param
     * @param int $i
     * @author klinson <klinson@163.com>
     */
    function info_array($param, $i = 0)
    {
        // 前置空格
        $space = '';
        $num = $i;
        while ($num) {
            $space .= '  ';
            $num--;
        }
    
        echo 'array['.count($param).']: {'.PHP_EOL;
        foreach ($param as $key => $item) {
            echo $space."  [{$key}] => ";
            info_item($item, $i+1);
        }
        echo $space.'}';
    }
    
    /**
     * 打印对象
     * @param $param
     * @param int $i
     * @author klinson <klinson@163.com>
     */
    function info_object($param, $i = 0)
    {
        // 前置空格
        $space = '';
        $num = $i;
        while ($num) {
            $space .= '  ';
            $num--;
        }
    
        echo 'object('.get_class($param).'['.count($param).']): {'.PHP_EOL;
        foreach ($param as $key => $item) {
            echo $space."  [{$key}] => ";
            info_item($item, $i+1);
        }
        echo $space.'}';
    }

### 测试代码： ###

$a = 1.11;
    $b = 'a';
    $c = [$a, $b];
    $d = new stdClass();
    $d->aaa = 'aaa';
    $d->bb = $c;
    info($a, $b, $c, $d);

### 效果如下: ###

![图片描述][3253953347-5c24994c8c34b_articlex]

[3253953347-5c24994c8c34b_articlex]: /images/20220302/012f298a69dc432783caebd4fd42c6d4.png