PHP 实现的将图片转换为TXT

PHP 实现的将图片转换为TXT
<?php/*2015年10月19日10:24:59*/// 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）;