How to use PHP to achieve image coding example sharing

How to use PHP to implement image coding? Image coding can be achieved using the GD library. This article mainly introduces the method of implementing partial coding of pictures in PHP. I hope it will be helpful to everyone.

Principle:

Add a certain width and height to each pixel of the selected area in the image to generate a rectangle. The rectangles of each pixel overlap to form a mosaic effect.
This example uses the imagecolorat of the GD library to obtain the pixel color, and uses imagefilledrectangle to draw the rectangle.

The rendering is as follows:

The code is as follows:

$owidth || $x1<0 || $x2>$owidth || $x2<0 || $y1>$oheight || $y1<0 || $y2>$oheight || $y2<0){ return false; } switch($otype){ case 1: $source_img = imagecreatefromgif($source); break; case 2: $source_img = imagecreatefromjpeg($source); break; case 3: $source_img = imagecreatefrompng($source); break; default: return false; } // 打马赛克 for($x=$x1; $x<$x2; $x=$x+$deep){ for($y=$y1; $y<$y2; $y=$y+$deep){ $color = imagecolorat($source_img, $x+round($deep/2), $y+round($deep/2)); imagefilledrectangle($source_img, $x, $y, $x+$deep, $y+$deep, $color); } } // 生成图片 switch($otype){ case 1: imagegif($source_img, $dest); break; case 2: imagejpeg($source_img, $dest); break; case 3: imagepng($source_img, $dest); break; } return is_file($dest)? true : false; } $source = 'source.jpg'; $dest = 'dest.jpg'; $flag = imageMosaics($source, $dest, 176, 98, 273, 197, 4); echo ''; echo ''; ?>

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