Classic PHP File Upload class

In the classroom to write a classic file upload class, flexibility can also, you can refer to the use of

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<?php/** * author:PHP100.com * date:2012-9-15 Classic File Upload class   **/ if (!empty ($_post[' Sub ')) {  Include (" Up.class.php ");      $up = new Up ($_files[' up ']); parameters, file flow required, "Specify directory, specify size, specify filename" optional &nbsp}  ?>   <form action= "method=" post "enctype=" multipart/ Form-data "> <input type=" File "name=" Up "> <input type=" Submit "Name=" sub "value=" Upload "> </form>   Upload class:   <?php/** * author:PHP100.com * date:2012-9-15 Classic File Upload class   **/ class up {   & nbsp Public $f _size;//defined file size     Public $f _sys;//receive file properties public $f _name;//custom file name public $f _dir;//Custom upload directory  //Ginseng Number: File stream, directory, size, filename function __construct ($sys, $dir = "", $size = "1", $name = "") {  $this->f_size= $size *1000000;   $this->f_sys= $sys;   $this->f_name= $name;   $this->f_dir= $dir;   $this-&GT;F_MV ();  //Judging file size    function is_size () {      if ($this->f_sys[' size ']<= $this->f_size ){   return true;  }else{   return false;  }    }//end       &NBS p;//determines the file type, returns the extension    function is_type () {  switch ($this->f_sys[' type ')) {case "image/x-png": $ok = ". PNG "; Break Case "Image/png": $ok = ". png"; Break Case "Application/pdf": $ok = ". pdf"; Break Case "Image/pjpeg": $ok = ". jpg"; Break Case "Image/jpeg": $ok = ". jpg"; Break Case "Image/jpg": $ok = ". jpg"; Break Default: $ok =false; Break return $ok;     &nbsp        //termination function    function F_over ($n) {     echo $n Exi T ();   &nbsp        //determine if a folder exists and create    function Is_dirs () {    if ($this->f_d IR) {if (!is_dir ($this->f_dir)) {    mkdir ($this->f_dir);} return $this->f_dir;} else{if (!is_dir ("YMD")) {    mkdir (Date ("YMD"));} return Date ("YMD");}    }     &nbs P      //file name definition, not defined and use timestamp &nbsP  function Is_name () {      if ($this->f_name) {  $FN = $this->f_name. $this->is_type ();  }else{  $FN =time (). Rand (100,999). $this->is_type ();    return $this->is_dirs (). /". $fn;   &nbsp        //upload file    function f_mv () {  $this->is_size ()? null: $this- >f_over ("File exceeds size");   $this->is_type () null: $this->f_over ("Incorrect file type");; Move_uploaded_file ($this->f_sys[' tmp_name '), $this->is_name ());  //Please continue to refine, watermark, et cetera  }    ?>