PHP implements the conversion of images to ASCII code

This article mainly introduces the implementation of PHP to convert the image to ASCII code, interested in the friend's reference, I hope to be helpful to everyone.

PHP implemented to convert a picture to TXT

<?php/*2015 October 19 10:24:59*///Open an image $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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