php - move_upload_file uploading old file? -

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i'm working on "edit post" page allows users upload picture replace old picture (displayed @ bottom of post). here's code:

if (isset($_files['pic']['tmp_name']) && $_files['pic']['name']!=null) {              $target_file1 = $dir . $postid . "." . $imagefiletype1;             $target_png1 = $dir . $postid . ".png";             $target_jpg1 = $dir . $postid . ".jpg";             $target_jpeg1 = $dir . $postid . ".jpeg";              if (file_exists($target_png1)) {                 unlink($target_png1);             }             if (file_exists($target_jpg1)) {                 unlink($target_jpg1);             }             if (file_exists($target_jpeg1)) {                 unlink($target_jpeg1);             }             move_uploaded_file($_files["pic"]["tmp_name"], $target_file1);         }

through doing testing, know works fine long new picture different extension original. if it's same extension deletes old 1 , move_uploaded_file reuploads old one.

i know because commented out "move_uploaded_files" , deleted old file.

any clues why reuploading old file instead of uploaded one?


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