我们都知道php有强大的功能，给我带来了许多方便，我们这里来看看php上传文件类型的实现。php支持上传文件的功能，但并不是所有支持php的网站都支持此功能，特别是免费的网站。
实现上传，首先要在HTML上加入上传文件的“＜FORM＞”表格。
<OL class=dp-xml><LI class=alt><SPAN><SPAN>＜form </SPAN><SPAN class=attribute><FONT color=#ff0000>method</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>post</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>action</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"upload.php"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>ENCTYPE</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"multipart/form-data"</FONT></SPAN><SPAN>＞ </SPAN></SPAN><LI class=""><SPAN>＜input </SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"file"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"upload_file"</FONT></SPAN><SPAN>＞ </SPAN></SPAN><LI class=alt><SPAN>＜input </SPAN><SPAN class=attribute><FONT color=#ff0000>type</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"submit"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"submit"</FONT></SPAN><SPAN> </SPAN><SPAN class=attribute><FONT color=#ff0000>value</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>"上传文件"</FONT></SPAN><SPAN>＞ </SPAN></SPAN></LI></OL>
用PHP上传文件类型时，需要对内容作详细的检查，例如是否容许读写文件，文件格式、文件大小是否在你指定的大小内等。
<OL class=dp-xml><LI class=alt><SPAN><SPAN>＜? </SPAN></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>file_size_max</SPAN><SPAN> = </SPAN><SPAN class=attribute-value>1000000</SPAN><SPAN>; </SPAN></SPAN><LI class=alt><SPAN>// 限制文件上传最大容量(bytes) </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>store_dir</SPAN><SPAN> = </SPAN><SPAN class=attribute-value>"/public/www/upload/"</SPAN><SPAN>; </SPAN></SPAN><LI class=alt><SPAN>// 上传文件的储存位置 </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute>accept_overwrite</SPAN><SPAN> = </SPAN><SPAN class=attribute-value>true</SPAN><SPAN>; </SPAN></SPAN><LI class=alt><SPAN>//允许读写文件 </SPAN><LI class=""><SPAN>// 检查文件大小 </SPAN><LI class=alt><SPAN>if ($upload_file_size ＞ $file_size_max) { </SPAN><LI class=""><SPAN>echo "对不起，你的文件容量大于规定"; </SPAN><LI class=alt><SPAN>exit; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>// 检查读写文件 </SPAN><LI class=""><SPAN>if (file_exists($store_dir . $upload_file_name) &&&& !$accept_overwrite) { </SPAN><LI class=alt><SPAN>echo "文件已存在，不能再复制"; </SPAN><LI class=""><SPAN>exit; </SPAN><LI class=alt><SPAN>} </SPAN><LI class=""><SPAN>//复制文件到指定目录 </SPAN><LI class=alt><SPAN>if (! @ copy($upload_file,$store_dir . $upload_file_name)) { </SPAN><LI class=""><SPAN>echo "复制文件失败"; </SPAN><LI class=alt><SPAN>exit; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>echo "上传文件完成"; </SPAN><LI class=""><SPAN>?＞ </SPAN></LI></OL>
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