用PHP自己实现的var_dump函数（没有用foreach输出数组）

最新推荐文章于 2024-06-30 16:01:39 发布

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最新推荐文章于 2024-06-30 16:01:39 发布

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本文介绍了一个自定义PHP函数my_var_dump，用于解析并输出变量的类型、值、对象属性等信息，包括布尔型、整型、浮点型、字符串、数组、对象和资源类型。通过该函数，可以深入理解PHP中不同数据类型的特性及其在实际编程中的应用。

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<?php 
    function
my_var_dump() 
    {
         for($i
= 0; $i<func_num_args(); ++$i)
            {
                $param
= func_get_arg($i);
                $ptype=gettype($param);
                switch($ptype)
                {
                    case
"NULL": 
                        echo
"NULL"; 
                        break;
                    case
"boolean": 
                        var_dump_boolean($param);
                        break;
                    case
"integer": 
                        var_dump_integer($param);
                        break;
                    case
"double": 
                        var_dump_double($param);
                        break;
                    case
"string": 
                        var_dump_string($param);
                        break;
                    case
"array": 
                        var_dump_array($param);
                        break;
                    case
"object": 
                        var_dump_object($param);
                        break;
                    case
"resource": 
                        echo
"resource"; 
                        break;
                    default:
                        echo
"unknown type"; 
                }
            }
    }
      
    function
var_dump_boolean($bool)
    {
        if($bool)
            echo
"bool(true)"; 
        else
            echo
"bool(false)"; 
    }
      
    function
var_dump_integer($int)
    {
        echo
"int($int)"; 
    }
      
    function
var_dump_double($double)
    {
        echo
"float($double)"; 
    }
    /**
    * param:String str
    * des:输出字符串类型的变量
    */
    function
var_dump_string($str)
    {
        $len=strlen($str);
        $value="string($len) \"$str\"";
        echo
$value; 
    }
      
    function
var_dump_array($arr)
    {
        $keys=array_keys($arr);
        $len=count($arr);
        echo
"array($len){"; 
          
        for($i=0;$i<$len;$i++)
        {
            echo
" [\"$keys[$i]\"]=> "; 
            $index=$keys[$i];
            my_var_dump($arr[$index]);
        }
        echo
"}"; 
    }
      
    function
var_dump_prop($obj)
    {
        $reflect
= new 
ReflectionClass($obj);
        $prop
= $reflect->getDefaultProperties(); 
        $keys=array_keys($prop);
        $len=count($prop);
        echo
" ($len){"; 
          
        for($i=0;$i<$len;$i++)
        {
            echo
" [\"$keys[$i]\"]=> "; 
            $index=$keys[$i];
            my_var_dump($prop[$index]);
        }
        echo
"}"; 
    }
    function
var_dump_object($obj)
    {
        $objId=1; 
//对象id 
        $className=get_class($obj);
        echo
"object($className)#$objId ";
        var_dump_prop($obj); 
    }
      
    /*以下为测试*/
    class
MyClass 
    {
        var
$sss; 
        function
test() 
        {
            echo
"Dd"; 
        }
    }
  
    $ddd="hhh";
    my_var_dump(new
MyClass()); 
    $arr2=array("Ddd"=>"Ddaddad","Dadadadad"=>array("ddddd"=>"Dddd"),"Ddddad"=>1);
    my_var_dump($arr2);
?>