php 将图片转换为ASCII码的完整示例

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经测试代码如下：

/**
 * 将图片转换为ASCII码
 *
 * @param 
 * @arrange (512.笔记) www.q1010.com
 **/
// 打开一幅图像
$file_name='d:\ascii_dora.png';
$chars = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ";
function getimgchars($color_tran,$chars){
$length = strlen($chars);
$alpha=$color_tran['alpha'];
$r=$color_tran['red'];
$g=$color_tran['green'];
$b=$color_tran['blue'];
$gray = intval(0.2126 * $r + 0.7152 * $g + 0.0722 * $b);
if($gray==0){
return '.';
}
if($gray<196){
$unit = (256.0 + 1)/$length;
return $chars[intval($gray/$unit)];
}
return " ";
}
function color_img($color_tran,$chars){
$length = strlen($chars);
$alpha=$color_tran['alpha'];
$r=$color_tran['red'];
$g=$color_tran['green'];
$b=$color_tran['blue'];
$gray = intval(0.2126 * $r + 0.7152 * $g + 0.0722 * $b);
$rand=rand (0, $length-1);
$color="rgb(".$r.",".$g.",".$b.")";
$char=$chars[$rand];
return '<span style="color:'.$color.'" >'.$char."</span>";;
}
function resize_img($file_name,$chars,$flage=true){
//header('Content-Type: image/jpeg');
list($width, $height,$type) = getimagesize($file_name);
$fun='imagecreatefrom' . image_type_to_extension($type, false);
if($type==3){
$flage=false;
}
$fun($file_name);
$new_height =100;
$percent=$height/$new_height;
$new_width=$width/$percent;
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = $fun($file_name);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
if($flage){
return $image_p;
}else{
return $image;
}
}
$im=resize_img($file_name,$chars);
$width=imagesx($im);
$height=imagesy($im);
$back_text="";
for($i=1;$i<=$height;$i++){
for($j=1;$j<=$width;$j++){
$color_index = imagecolorat($im, $j-1, $i-1);
$color_tran = imagecolorsforindex($im, $color_index);
$back_text.=color_img($color_tran,$chars,false);
}
$back_text.="<br/>";
}
echo "<pre>";
echo $back_text;
echo "</pre>";
//file_put_contents('1.txt',$back_text);

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关键词：ASCII