php upload file condition not working -

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i have page the visitor can upload file, thats not required, in script put condition if file input (i named 'upload') not set or empty don't upload anything, , file name equal 'file' existed in db; else upload it. problem condition not working; when leave input empty upload script executed; know because messages declared in script here coded , thank you

    //select exercice $ex_query = mysqli_query($link, " select * exercices id = '".$exercice_id."' "); $exercice = mysqli_fetch_assoc($ex_query); // --- update script if post if ($_server['request_method'] == 'post') {     if (isset($_files["upload"]) && !empty($_files["upload"])){         $target_dir = "docs/";         $date_f_n = date("y-m-d_h-i-sa");         $file_n = basename( $_files["upload"]["name"]);         $file_n = $date_f_n.$file_n;         $target_file = $target_dir . $file_n;         $uploadok = 1;         $filetype = pathinfo($target_file,pathinfo_extension);         // check if  file actual image or fake image             $check = filesize($_files["upload"]["tmp_name"]);             if($check !== false) {                 $uploadok = 1;             } else {                 $filesizeer = "file not image.";                 $uploadok = 0;             }          // check file size         if ($_files["upload"]["size"] > 5000000) {             $filesizeer = "sorry, file large.";             $uploadok = 0;         }         // check if $uploadok set 0 error         if ($uploadok == 0) {             $error = "sorry, file not uploaded.";         // if ok, try upload file         } else {              if (move_uploaded_file($_files["upload"]["tmp_name"], $target_file)) {             $upsuccess= "the file ". $file_n. " has been uploaded.";             } else {                 $upfaled =  "sorry, there error uploading file.";             }         }//end else upload = 0     }else{         $file_n = $exercice['file'];     }

the first thing have upload check if upload performed @ all, , succeeded. because $_files['foo'] exists doesn't mean upload of foo file succeeded.

bare minimum checking:

if ($_files['foo']['error'] !== upload_err_ok) {    die("upload failed error code #" . $_files['foo']['error']); }

or even

if (isset($_files['foo']) && etc...)

if want strictly correct.

if want allow non-uploads, still fail on real errors, check specific error codes you'd allow "ok". error codes defined here: http://php.net/manual/en/features.file-upload.errors.php


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