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>
<li class=""><span>{ </span></li>
<li class="alt"><span>if(!empty($path) && !file_exists($path)) </span></li>
<li class=""><span>{ </span></li>
<li class="alt"><span> echo '上传文件的路径不存在';exit; </span></li>
<li class=""><span>} </span></li>
<li class="alt"><span>//允许上传的文件类型 </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">filetype</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span> </span>
</li>
<li class="alt"><span>( </span></li>
<li class="">
<span> </span><span class="attribute"><font color="#ff0000">1</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array('gif','png','jpg','jpeg','bmp'), </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">2</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array('swf','flv'), </span>
</li>
<li class="">
<span> </span><span class="attribute"><font color="#ff0000">3</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array('rm','rmvb','avi','wmv','mpg','asf','mp3','wma','wmv','mid'), </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">4</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array('txt','doc','xls','ppt','pdf','xml','rar','zip','gzip','cab','iso','sql'), </span>
</li>
<li class="">
<span> </span><span class="attribute"><font color="#ff0000">6</font></span><span> =</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> array('exe','com','scr','bat') </span>
</li>
<li class="alt"><span>); </span></li>
<li class=""><span>//上传文件类型数组合并 </span></li>
<li class="alt"><span>$filetype[5] = array_merge($filetype[2],$filetype[3]); </span></li>
<li class=""><span>//获得$_FILES数组的所有key </span></li>
<li class="alt">
<span>$</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>($_FILES); </span>
</li>
<li class=""><span>//判断要上传的文件名称 </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">file</font></span><span> = $_FILES[$arr_key[0]]; </span>
</li>
<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>
</li>
<li class="alt"><span>//判断文件上传类型 </span></li>
<li class=""><span>if($type!=7 && !in_array($exten,$filetype[$type])) </span></li>
<li class="alt"><span>{ </span></li>
<li class=""><span> echo $file['name'].'的文件类型不符合要求!';exit; </span></li>
<li class="alt"><span>} </span></li>
<li class=""><span>//判断文件大小 </span></li>
<li class="alt">
<span>if($file['size']</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>$filesize) </span>
</li>
<li class=""><span>{ </span></li>
<li class="alt"><span> echo $file['size'].'的文件大小不能超过'.$filesize.'字节';exit; </span></li>
<li class=""><span>} </span></li>
<li class="alt"><span>//开始上传 </span></li>
<li class=""><span>//move_uploaded_file($file['tmp_name'],$path.$file['name']); </span></li>
<li class="alt"><span>//为了避免覆盖,重命在旦夕名该文件 </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">newname</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">time</font></span><span>().'.'.$exten; </span>
</li>
<li class="alt"><span>move_uploaded_file($file['tmp_name'],$path.$newname); </span></li>
<li class=""><span>return $newname; </span></li>
<li class="alt"><span>} </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span>echo uploafile('',$</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>
</li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>以上就是详细PHP上传文件代码，很简单吧。
