PHP学习：php实现图片添加描边字和马赛克的方法

<?php
/**
 * gd image mask
 *
 * @copyright ugia.cn
 
 */
function imagemask(&$im, $x1, $y1, $x2, $y2, $deep)
{
    for($x = $x1; $x < $x2; $x += $deep)
    {
        for ($y = $y1; $y < $y2; $y += $deep)
        {
            $color = imagecolorat ($im, $x + round($deep / 2), $y + round($deep / 2));
            imagefilledrectangle ($im, $x, $y, $x + $deep, $y + $deep, $color);
        }
    }
}
//马赛克用法示例：
header("content-type: image/png");
$im = imagecreatefromjpeg("test.jpg");
imagemask($im, 57, 22, 103, 40, 8);
imagepng($im);
imagedestroy($im);
?>

<?php
/**
 * gd image text outer
 *
 * @copyright ugia.cn
 
 */
function imagetextouter(&$im, $size, $x, $y, $color, $fontfile, $text, $outer)
{
    if (!function_exists('imagecolorallocatehex'))
    {
        function imagecolorallocatehex($im, $s)
        {
           if($s{0} == "#") $s = substr($s,1);
           $bg_dec = hexdec($s);
           return imagecolorallocate($im,
                       ($bg_dec & 0xff0000) >> 16,
                       ($bg_dec & 0x00ff00) >>  8,
                       ($bg_dec & 0x0000ff)
                       );
        }
    }
    $ttf = false;
    if (is_file($fontfile))
    {
        $ttf = true;
        $area = imagettfbbox($size, $angle, $fontfile, $text);
        $width  = $area[2] - $area[0] + 2;
        $height = $area[1] - $area[5] + 2;
    }
    else
    {
        $width  = strlen($text) * 10;
        $height = 16;
    }
    $im_tmp = imagecreate($width, $height);
    $white = imagecolorallocate($im_tmp, 255, 255, 255);
    $black = imagecolorallocate($im_tmp, 0, 0, 0);
    $color = imagecolorallocatehex($im, $color);
    $outer = imagecolorallocatehex($im, $outer);
    if ($ttf)
    {
        imagettftext($im_tmp, $size, 0, 0, $height - 2, $black, $fontfile, $text);
        imagettftext($im, $size, 0, $x, $y, $color, $fontfile, $text);
        $y = $y - $height + 2;
    }
    else
    {
        imagestring($im_tmp, $size, 0, 0, $text, $black);
        imagestring($im, $size, $x, $y, $text, $color);
    }
    for ($i = 0; $i < $width; $i ++)
    {
        for ($j = 0; $j < $height; $j ++)
        {
            $c = imagecolorat($im_tmp, $i, $j);
            if ($c !== $white)
            {
                imagecolorat ($im_tmp, $i, $j - 1) != $white || imagesetpixel($im, $x + $i, $y + $j - 1, $outer);
                imagecolorat ($im_tmp, $i, $j + 1) != $white || imagesetpixel($im, $x + $i, $y + $j + 1, $outer);
                imagecolorat ($im_tmp, $i - 1, $j) != $white || imagesetpixel($im, $x + $i - 1, $y + $j, $outer);
                imagecolorat ($im_tmp, $i + 1, $j) != $white || imagesetpixel($im, $x + $i + 1, $y + $j, $outer);
                // 取消注释,与fireworks的发光效果相同
                /*
                imagecolorat ($im_tmp, $i - 1, $j - 1) != $white || imagesetpixel($im, $x + $i - 1, $y + $j - 1, $outer);
                imagecolorat ($im_tmp, $i + 1, $j - 1) != $white || imagesetpixel($im, $x + $i + 1, $y + $j - 1, $outer);
                imagecolorat ($im_tmp, $i - 1, $j + 1) != $white || imagesetpixel($im, $x + $i - 1, $y + $j + 1, $outer);
                imagecolorat ($im_tmp, $i + 1, $j + 1) != $white || imagesetpixel($im, $x + $i + 1, $y + $j + 1, $outer);
                */
            }
        }
    }
    imagedestroy($im_tmp);
}

//用法示例：
header("content-type: image/png");
$im = imagecreatefromjpeg("bluesky.jpg");
$white = imagecolorallocate($im, 255,255,255);
imagetextouter($im, 9, 10, 20, '#000000', "simsun.ttc", '新年快乐', '#ffffff');
imagetextouter($im, 2, 10, 30, '#ffff00', "", 'hello, world!' , '#103993');
imagepng($im);
imagedestroy($im);
?>PHP教程