PHP Image upload function implementation

Upload image function:

Get current folder location, upload to current folder

In order to upload after the file name repeatedly caused the overwrite, after uploading the change name: Current time + original file name

Only allow file uploads in GIF, JPEG, BMG, JPG format

<form name= "Frm1"  enctype= "Multipart/form-data"  action= ""  method= "POST" >     <input name= "filename"  type= "file"  style= "border:solid 1px  #6ac1e2;  width: 200px; border-radius: 5px "/>    <input name=" submit " type=" Submit " value=" submitted " style=" background-color:  #e28c8e;border-radius: 5px;  font-size: 14px; " /></form><?phpif (Isset ($_post[' submit '))  {     $dir  = dirname (_ _file__);     $dir  = str_replace ("//",  "/",  $dir)  .  "/";     date_default_timezone_set ("PRC");     $date  = date (  "Ymdhis");     $filename  =  $date. $_files[' filename ' [' Name '];      $uploadfile  =  $dir  .  $filename;     $tp  = array ("ImagE/gif "," Image/jpeg "," IMAGE/BMG "," image/jpg "),     if (!in_array ($_files[" filename "[" type "], $TP)  {        echo  ' <script>alert ("Allow uploading of picture formats: Jpg/jpeg /gif/bmp ") </script> ';    }else{         $r _sc  = move_uploaded_file ($_files[' filename '] ["tmp_name"], $uploadfile);         echo  '  ';    }}?>

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PHP Image upload function implementation