php还是比较常用的，对于它的强大功能想必大家也都知道了，我们这里就实现php上传文件代码分析。php之所以很难实现上传进度条是因为在我们上传文件到服务器的时候，要等到文件全部送到服务器之后，才执行相应的php文件。在这之前，文件数据保存在一个临时文件里面，而php无法获得这个文件的路径及大小。
php上传文件判断要存放的路径是否存在 is_dir()，if文件的类型是否达到要求 explode('.',name)array() in_array()，if文件的大小是否达到要求 $_FILES[size]可以上传了 move_uploaded_file($_FILES[]['tmp_name'],要存放的路径和文件名称)原名存放直接拿$_FILES[]['name'] 还是重命名:time()。
PHP上传文件代码：
<OL class=dp-xml><LI class=alt><SPAN><SPAN>function uploafile($path,$</SPAN><SPAN class=attribute><FONT color=#ff0000>filesize</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>10241000</FONT></SPAN><SPAN>,$</SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>) </SPAN></SPAN><LI class=""><SPAN>{ </SPAN><LI class=alt><SPAN>if(!empty($path) && !file_exists($path)) </SPAN><LI class=""><SPAN>{ </SPAN><LI class=alt><SPAN> echo '上传文件的路径不存在';exit; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>//允许上传的文件类型 </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>filetype</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN> </SPAN></SPAN><LI class=alt><SPAN>( </SPAN><LI class=""><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>1</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> array('gif','png','jpg','jpeg','bmp'), </SPAN></SPAN><LI class=alt><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>2</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> array('swf','flv'), </SPAN></SPAN><LI class=""><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>3</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> array('rm','rmvb','avi','wmv','mpg','asf','mp3','wma','wmv','mid'), </SPAN></SPAN><LI class=alt><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>4</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> array('txt','doc','xls','ppt','pdf','xml','rar','zip','gzip','cab','iso','sql'), </SPAN></SPAN><LI class=""><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>6</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> array('exe','com','scr','bat') </SPAN></SPAN><LI class=alt><SPAN>); </SPAN><LI class=""><SPAN>//上传文件类型数组合并 </SPAN><LI class=alt><SPAN>$filetype[5] = array_merge($filetype[2],$filetype[3]); </SPAN><LI class=""><SPAN>//获得$_FILES数组的所有key </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>arr_key</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array_keys</FONT></SPAN><SPAN>($_FILES); </SPAN></SPAN><LI class=""><SPAN>//判断要上传的文件名称 </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>file</FONT></SPAN><SPAN> = $_FILES[$arr_key[0]]; </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>exten</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>check_file_type</FONT></SPAN><SPAN>($file['name']); </SPAN></SPAN><LI class=alt><SPAN>//判断文件上传类型 </SPAN><LI class=""><SPAN>if($type!=7 && !in_array($exten,$filetype[$type])) </SPAN><LI class=alt><SPAN>{ </SPAN><LI class=""><SPAN> echo $file['name'].'的文件类型不符合要求!';exit; </SPAN><LI class=alt><SPAN>} </SPAN><LI class=""><SPAN>//判断文件大小 </SPAN><LI class=alt><SPAN>if($file['size']</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>$filesize) </SPAN></SPAN><LI class=""><SPAN>{ </SPAN><LI class=alt><SPAN> echo $file['size'].'的文件大小不能超过'.$filesize.'字节';exit; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>//开始上传 </SPAN><LI class=""><SPAN>//move_uploaded_file($file['tmp_name'],$path.$file['name']); </SPAN><LI class=alt><SPAN>//为了避免覆盖,重命在旦夕名该文件 </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>newname</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>time</FONT></SPAN><SPAN>().'.'.$exten; </SPAN></SPAN><LI class=alt><SPAN>move_uploaded_file($file['tmp_name'],$path.$newname); </SPAN><LI class=""><SPAN>return $newname; </SPAN><LI class=alt><SPAN>} </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>echo uploafile('',$</SPAN><SPAN class=attribute><FONT color=#ff0000>filesize</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>10241000</FONT></SPAN><SPAN>,$</SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>3</FONT></SPAN><SPAN>); </SPAN></SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></FONT></STRONG></SPAN><SPAN> </SPAN></SPAN></LI></OL>以上就是详细PHP上传文件代码，很简单吧。
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