前两天研究php中的 imagick 扩展的时候，突发奇想实现的一个小功能感觉挺有意思，在这里记录一下：

将一张image图片转化为字符串的形式，先上一张效果图。（运行笔记中的代码需要先安装 php_imagick 扩展 教程可以看这里：PHP扩展之 Imagick安装）

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原图：

<?php
/**
* 图片转换为字符图
* @param string $imagePath 图片地址
* @param int $width x轴方向缩放比例
* @param int $height y轴方向缩放比例
* @return string 生成的字符串图
*/
function img2String($imagePath,$width=1,$height=1)
{//检查是否安装 php_imagick 扩展if(!extension_loaded("imagick")){exit("请先安装 imagick 模块");}$imagick = new \Imagick(realpath($imagePath));//将生成的imagick对象转化为一个像素迭代器，可以从该迭代器中获取没个像素的 rgb 的值。不知道什么是rgb的请问度娘$imageIterator = new \ImagickPixelIterator($imagick);$str='O80GCLft*+;:,. ';foreach ($imageIterator as $rows => $pixels) {if($rows%$width == 1 || $width == 1){echo "\n";foreach ($pixels as $column => $pixel) {if($column%$height == 1 || $height == 1){//灰度计算公式  某个像素点的灰度值 = 红色值*0.3 + 绿色值 * 0.59 + 蓝色值 * 0.11$gray = $pixel->getColor()['r']*0.3 + $pixel->getColor()['g']*0.59 + $pixel->getColor()['b']*0.11;//由于 rgb 三原色的数值范围在 [0,255] 所以求出的灰度值的范围也是 [0,255],所以我们计算像素的 "饱和度" = 灰度值/255;$r = $gray/255;//根据像素的 "饱和度" 选择合适的字符$offset=(int)ceil($r*(strlen($str)-1));    if($offset==(strlen($str)-1)){echo " ";}else{echo $str[$offset];  }}         }$imageIterator->syncIterator();}    }
}img2String('huawei.jpg',2,1);

转载于:https://www.cnblogs.com/itsuibi/p/10997258.html

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