php - file_exists not behaving properly -

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i writing script upload file part of php project. if file exists same name, instead of moving file anyway , overwriting whatever there, using header() refresh page , add message rename file before uploading.

however, not working. program moves file on regardless if name taken. have tested if(file_exists($_server['document_root'] . "/uploads/" . $_files['uploadfile']['name'])) , seems work independently not within structure of program. can't figure out goes wrong though.

here code

<?php include ('includes/openfile.php');  if(isset($_files['uploadfile'])) {  $allowed = array('image/jpg', 'image/jpeg', 'image/png', 'text/plain');  // validate file type if(in_array($_files['uploadfile']['type'], $allowed)) {      //check if file exists current file name in order prevent overwrite -- prevents overwrite .htaccess attack protecting user files      if(file_exists($_server['document_root'] . "/uploads/" . $_files['uploadfile']['name']))     {             // file must have unique name             header("location: file-upload.php?msg=" . urlencode(base64_encode("please rename file.")));      }     else     {             // file has unique name, move uploads directory             move_uploaded_file($_files['uploadfile']['tmp_name'], "../uploads/" . $_files['uploadfile']['name']);     } } else {             header("location: file-upload.php?msg=" . urlencode(base64_encode("please upload .jpg, .jpeg, .png, or .txt file type")));     }  // check file error if($_files['uploadfile']['error'] > 0) {  echo "<h1 class='jumbotron error'>there error because </h1>";  switch ($_files['uploadfile']['error']) {     case 1:         echo "<h2 class='jumbtron'>file exceeds upload max file size</h2>";         break;     case 2:         echo "<h2 class='jumbtron'>file exeeds max file size in html form</h2>";         break;     case 3:         echo "<h2 class='jumbtron'>file partially uploadeded</h2>";         break;     case 4:         echo "<h2 class='jumbtron'>no file uploaded</h2>";         break;     case 6:         echo "<h2 class='jumbtron'>no temporary folder available</h2>";         break;     case 7:         echo "<h2 class='jumbtron'>unable write disk</h2>";         break;     case 8:         echo "<h2 class='jumbtron'>file upload stopped</h2>";         break;       default:         echo "<h2 class='jumbtron'>a system error has occured</h2>";         break;     } }  else {   # todo: encrypt uploaded file  // delete tmp file if(file_exists($_files['uploadfile']['tmp_name']) && is_file($_files['uploadfile']['tmp_name'])) {     unlink($_files['uploadfile']['tmp_name']); }  // let user know file succesfully uploaded header("location: file-upload.php?success=" . urlencode(base64_encode("file uploaded successfully!")));  } }   include ('includes/closefile.php'); ?>

thanks help!


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