PHP 如何阻止用户上传成人照片或者裸照

PHP 如何阻止用户上传成人照片或者裸照

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PHP 如何阻止用户上传成人照片或者裸照

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在这份教程中，我们将会学习到如何组织用户通过PHP上传成人照片或者裸照.

示例: http://www.rrpowered.com/demo/NudityFilter/
下载: http://www.rrpowered.com/code/RRPowered-NudityFilter.zip

我在phpclasses.org上面偶然发现一个很有用的，由Bakr Alsharif开发的可以帮助开发者基于皮肤像素点来检测图片裸照的类文件.

它会分析在一张图片的不同部分使用的颜色，并决定其是否匹配人类皮肤颜色的色调.

作为分析的结果，他会返回一个反映图片包含裸露的可能性的分值.

此外，他还可以输出被分析的图片，上面对使用给定颜色的肤色的像素进行了标记.

当前它可以对PNG，GIF和JPEG图片进行分析.

PHP

下面展示了如何使用这个PHP类.
让我们先从包含裸体过滤器，nf.php文件开始.

<code class=" hljs ruby"><span class="hljs-keyword">include</span> (<span class="hljs-string">'nf.php'</span>);</code>

接下来，创建一个新的名叫ImageFilter的类，然后把它放到一个叫做$filter的变量中.

<code class=" hljs php"><span class="hljs-variable">$filter</span> = <span class="hljs-keyword">new</span> ImageFilter;</code>

获取图片的分值并将其放到一个$score变量中.

<code class=" hljs bash"><span class="hljs-variable">$score</span> = <span class="hljs-variable">$filter</span> -> GetScore(<span class="hljs-variable">$_FILES</span>[<span class="hljs-string">'img'</span>][<span class="hljs-string">'tmp_name'</span>]);</code>

如果图片分值大于或等于60%，那就展示一条（告警）消息.

<code class=" hljs ruby"><span class="hljs-keyword">if</span>(<span class="hljs-variable">$score</span> >= <span class="hljs-number">60</span>){<span class="hljs-regexp">/*Message*/</span>}</code>

下面是所有的PHP代码:

<code class=" hljs xml"><span class="php"><span class="hljs-preprocessor"><?php </span><span class="hljs-comment">/*Include the Nudity Filter file*/</span><span class="hljs-keyword">include</span> (<span class="hljs-string">'nf.php'</span>);<span class="hljs-comment">/*Create a new class called $filter*/</span><span class="hljs-variable">$filter</span> = <span class="hljs-keyword">new</span> ImageFilter;<span class="hljs-comment">/*Get the score of the image*/</span><span class="hljs-variable">$score</span> = <span class="hljs-variable">$filter</span> -> GetScore(<span class="hljs-variable">$_FILES</span>[<span class="hljs-string">'img'</span>][<span class="hljs-string">'tmp_name'</span>]);<span class="hljs-comment">/*If the $score variable is set*/</span><span class="hljs-keyword">if</span> (<span class="hljs-keyword">isset</span>(<span class="hljs-variable">$score</span>)) {<span class="hljs-comment">/*If the image contains nudity, display image score and message. Score value if more than 60%, it is considered an adult image.*/</span><span class="hljs-keyword">if</span> (<span class="hljs-variable">$score</span> >= <span class="hljs-number">60</span>) { <span class="hljs-keyword">echo</span> <span class="hljs-string">"Image scored "</span> . <span class="hljs-variable">$score</span> . <span class="hljs-string">"%, It seems that you have uploaded a nude picture."</span>;<span class="hljs-comment">/*If the image doesn't contain nudity*/</span>    } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (<span class="hljs-variable">$score</span> 0</span>) { <span class="hljs-keyword">echo</span> <span class="hljs-string">"Congratulations, you have uploaded an non-nude image."</span>;}}<span class="hljs-preprocessor">?></span></span></code>

标记语言

我们可以使用一个基础的HTML表单上传图片.

<code class=" hljs xml"><span class="hljs-tag">form</span> <span class="hljs-attribute">method</span>=<span class="hljs-value">"post"</span> <span class="hljs-attribute">enctype</span>=<span class="hljs-value">"multipart/form-data"</span> <span class="hljs-attribute">action</span>=<span class="hljs-value">"<?php echo $SERVER['PHP_SELF'];?> "</span>>Upload image: <span class="hljs-tag">input</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"file"</span> <span class="hljs-attribute">name</span>=<span class="hljs-value">"img"</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"img"</span> /><span class="hljs-tag">input</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"submit"</span> <span class="hljs-attribute">value</span>=<span class="hljs-value">"Sumit Image"</span> /><span class="hljs-tag"><span class="hljs-title">form</span>></span></code>

via:
http://www.oschina.net/translate/prevent-uploads-of-adult-or-nude-pictures-using-php
http://www.rrpowered.com/2014/04/prevent-uploads-of-adult-or-nude-pictures-using-php/