PHP文件上传
必须确保服务器目标文件夹的属性为可写：chmod 777 -R dir
?
主要步骤：
1、根据网页中设定位置，自建一个用于存储文件的文件夹cyupload
2、修改cyupload的权限，进入/tmp文件夹中，chmod 777 cyupload -R
3、参考http://www.w3schools.com/php/php_file_upload.asp 的??? 代码,分别建立upload.html 和 upload.php
4、根据需求将upload.php中的判断语句修改
5、修改php.ini文件，修改上传文件大小限制。
file_uploads = on ;是否允许通过HTTP上传文件的开关。默认为ON即是开
upload_tmp_dir ;文件上传至服务器上存储临时文件的地方，如果没指定就会用系统默认的临时文件夹
upload_max_filesize = 200m ;望文生意，即允许上传文件大小的最大值。默认为2M
post_max_size = 200m ;指通过表单POST给PHP的所能接收的最大值，包括表单里的所有值。默认为8M
一般地，设置好上述四个参数后，上传但如果要上传>8M的大体积文件，只设置上述四项还一定能行的通。
进一步配置以下的参数
max_execution_time = 0 ;
max_input_time = 2400 ;每个PHP页面接收数据所需的最大时间默认60秒
memory_limit = 256m ;每个PHP页面所吃掉的最大内存，默认8M
把上述参数修改后，在网络所允许的正常情况下，就可以上传大体积文件了
详细代码：upload.html
<html><body><form. enctype="multipart/form-data" action="up.php" method="post"><label for="file">Filename:</label><input type="file" name="file" id="file" /><br /><input type="submit" name="submit" value="upload"></form></body></html><!--enctype="multipart/form-data" 该属性在form中必须定义才能上传-->upload.php<?phpif ($_FILES["file"]["size"] < 210000000) { if ($_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("/tmp/cyupload/" . $_FILES["file"]["name"])) { echo $_FILES["file"]["name"] . " already exists. "; } else { move_uploaded_file($_FILES["file"]["tmp_name"], "/tmp/cyupload/" . $_FILES["file"]["name"]); echo "Stored in: " . "/tmp/cyupload/" . $_FILES["file"]["name"]; } } }else { echo "Invalid file"; }?>?
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