php - error in uploading file to a specified directory -

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i new php , trying upload file specified directory. when check condition given below:

     if(file_exists($target_dir))//check if file exists in uploads folder     {     echo "sorry! file exists";     $uploadok=0;   }

it shows "sorry! file exists";. picking imagefile c:\mypictures\ , path target directory c:\xampp\htdocs\uploads. having no idea why happening. great if clarify this.

here full code of upload.php file:

<?php $target_dir="c:/xampp/htdocs/uploads/"; $target_file=$target_dir.basename($_files["filetoupload"]["name"]); $uploadok=1; $imagefiletype=pathinfo($target_file,pathinfo_extension);  if(isset($_post["submit"]))    $check=getimagesize($_files["filetoupload"]["tmp_name"]);//check if file image or not         if($check == true)          echo "file image";         else         {          echo "file not image";          $uploadok=0;         } if(file_exists($target_dir))//check if file exists in uploads folder   {     echo "sorry! file exists";     $uploadok=0;   } //doubt if(filesize($target_file>500000))//check if file large    {     echo "file large";     $uploadok=0;   } if($imagefiletype!="jpg" && $imagefiletype!="png" && $imagefiletype!="jpeg" && $imagefiletype!="png")//check file type   {     echo "file type not supported";     $uploadok=0;   } if($uploadok==0)//checking errors   {     echo "some error occured.";   } else{     if(move_uploaded_file($_files["filetoupload"]["tmp_name"], $target_file))     {         echo "file uploaded";     }     else{         echo "file not uploaded....there error.";     } }     ?>

because checking directory not file. change code to

if(file_exists($target_file))//check if file exists in uploads folder   {     echo "sorry! file exists";     $uploadok=0;   } //do




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