PHP接收上传的文件
提交文件的HTML页面：
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>文件上传</title><!--注意：enctype="multipart/form-data";拼写不要写成enctype="multipart/from-data";重点：enctype="multipart/form-data"type="file"--></head><body> <form action="u.php" method="post" enctype="multipart/form-data"> 用户名:<input type="text" name="username" /><br /> 头像:<input type="file" name="pic" /><br /> <input type="submit" value="提交" /> </form></body></html>
PHP接收文件：
<?php/*PHP文件上传的过程:1:提交后,文件自动发到服务器上,形成一个临时文件2:在服务器上,只需要把临时文件移动到自己想要的位置，就可以完成上传操作疑问: 临时文件在哪儿呢?文件的其他信息如 文件名,文件大小,等,又在哪儿呢?答: PHP形成临时文件后,还会形成一个$_FILES超级全局数组数组里保存着文件的临时地址,临时名称,大小,等信息.所以 想上传文件,得先读$_FILES*//*文件上传的注意事项1:必须POST提交2:要声明 enctype选项*/echo "<pre class="brush:php;toolbar:false">";print_r($_FILES);echo "
内容来源：网络公益课，略有改动
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