php限制上传文件类型并保存上传文件的方法

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<?php

$allowedExts = array("gif", "jpeg", "jpg", "png");

$extension = end(explode(".", $_FILES["file"]["name"]));

if ((($_FILES["file"]["type"] == "image/gif")

|| ($_FILES["file"]["type"] == "image/jpeg")

|| ($_FILES["file"]["type"] == "image/jpg")

|| ($_FILES["file"]["type"] == "image/pjpeg")

|| ($_FILES["file"]["type"] == "image/x-png")

|| ($_FILES["file"]["type"] == "image/png"))

&& ($_FILES["file"]["size"] < 20000)

&& in_array($extension, $allowedExts))

{

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"] . " already exists. ";

}

else

{

move_uploaded_file($_FILES["file"]["tmp_name"],

"upload/" . $_FILES["file"]["name"]);

echo "Stored in: " . "upload/" . $_FILES["file"]["name"];

}

}

}

else

{

echo "Invalid file";

}

?>