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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.
<span class="hljs-keyword">include</span> (<span class="hljs-string">'nf.php'</span>);
接下来，创建一个新的名叫ImageFilter的类，然后把它放到一个叫做$filter的变量中.
<span class="hljs-variable">$filter</span> = <span class="hljs-keyword">new</span> ImageFilter;
获取图片的分值并将其放到一个$score变量中.
<span class="hljs-variable">$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>]);
如果图片分值大于或等于60%，那就展示一条（告警）消息.
<span class="hljs-keyword">if</span>(<span class="hljs-variable">$score</span> >= <span class="hljs-number">60</span>){<span class="hljs-regexp">/*Message*/</span>}
下面是所有的PHP代码:
/*Include the Nudity Filter file*/<span class="hljs-keyword">include</span> (<span class="hljs-string">'nf.php'</span>);/*Create a new class called $filter*/<span class="hljs-variable">$filter</span> = <span class="hljs-keyword">new</span> ImageFilter;/*Get the score of the image*/<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>]);/*If the $score variable is set*/if (isset($score)) {/*If the image contains nudity, display image score and message. Score value if more than 60%, it is considered an adult image.*/if ($score >= 60) { echo "Image scored " . $score . "%, It seems that you have uploaded a nude picture.";/*If the image doesn't contain nudity*/ } else if ($score < 0) { echo "Congratulations, you have uploaded an non-nude image.";}}?>
标记语言
我们可以使用一个基础的HTML表单上传图片.
<span class="hljs-tag"><<span class="hljs-title">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>></span>Upload image: <span class="hljs-tag"><<span class="hljs-title">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><span class="hljs-tag"><<span class="hljs-title">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><span class="hljs-tag"></<span class="hljs-title">form</span>></span>
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/
