先上源碼：upload_file.php
<html> <body> <form action="upload_file.php" method="post" enctype="multipart/form-data"> <label for="file">Filename:</label> <input type="file" name="file" id="file" /> <br /> <input type="submit" name="submit" value="Submit" /> <br/> <img name="img" style="width: 100px; height: 100px; border: 1px solid red;" src ="<?php echo "upload/" . $_FILES["file"]["name"]; ?>" /> </form> <?php if ((($_FILES["file"]["type"] == "image/png") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/pjpeg")) && ($_FILES["file"]["size"] < 20000000)) { if ($_FILES["file"]["error"] > 0) { echo "Return Code: " . $_FILES["file"]["error"] . "<br />"; } else { // echo "Upload: " . $_FILES["file"]["name"] . "<br />"; // echo "Type: " . $_FILES["file"]["type"] . "<br />"; // echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />"; // echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />"; if (file_exists("upload/" . $_FILES["file"]["name"])) { echo $_FILES["file"]["name"] . " 已經保存. "; } else { move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]); echo "存入: " . "upload/" . $_FILES["file"]["name"]; } } } else { echo "Invalid file"; } ?> </body> </html>
顯示效果如圖;
未上傳：
上傳提交但沒有該圖片:
上傳提交但已有該圖片:
