文件上传功能是一项源码系统中经常用到的实例功能，文章整理了php实现文件上传的方法，希望能够帮助到有这样需求的朋友！
核心思路：
<1>上传首页需要注意form表单中的entype，以及input中type的类型；
<2>上传页面中文件名后缀、文件的mime的获取；
<3>注意错误编号。
uploads_index.php代码：
<html>
<head>
<meta charset="utf-8">
<title>uploads_index</title>
</head>
<body>
<form action="uploads.php" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<br>
<input type="submit" name="" value="upload">
</form>
</body>
</html>
uploads.php代码：
<?php
$tmpfile = $_FILES['file']['tmp_name'];
$filetype = array_shift(explode("/", $_FILES['file']['type'])); //上传文件的mime类型
$filename = $_FILES['file']['name'];
$filefix = array_pop(explode(".", $_FILES['file']['name'])); //上传文件后缀名
if ($filetype == 'image') {
$dstfile = "uploads/imgs/".time()."_".mt_rand().".".$filefix;
} else {
$dstfile = "uploads/files/".time()."_".mt_rand().".".$filefix;
}
$filearr = array('gif', 'jpg', 'png'); //允许上传类型
$filesize = $_FILES['file']['size']; //上传文件的大小
$fileerror = $FILES['file']['error']; //错误编号
if ($fileerror === 0) {
if (in_array($filefix, $filearr)) { //判断是否符合上传允许类型
if ($filesize <= 35840) { //上传大小限制
if (move_uploaded_file($tmpfile, $dstfile)) {
echo "<script>alert('succeed!');location.href='uploads_index.php';</script>";
} else {
echo "<script>alert('fail!');location.href='uploads_index.php';</script>";
}
} else {
echo "<script>alert('pass filesize!');</script>";
}
} else {
echo "<script>alert('type fail!');</script>";
}
} else {
echo "<script>alert('error!!!');</script>";
}
