使用 PHP GD 库生成 PNG 图像，一切正常，没有错误。但是浏览器无法呈现我的图像。
我下载了生成的 PNG 并将其与 Ultraedit 中的普通 PNG 进行比较，我发现文件开头有一个额外的 20（十六进制模式）。从 ultraedit 中删除 20 后，PNG 工作正常。
我检查了我的代码，但找不到任何给出 0x20 的行。
代码的相关部分如下：
public function imggen($string = "Enter your own lyric.",
$size = 35,
$lineheight = 50,
$font = "./fonts/w6.ttf",
$meta = "Project Gy Picture Generation",
$metasize = 10,
$metalineh = 25,
$bg_src = "./img/bg/bg1.png",
$textcolor = "w",
$width=640,
$height=596,
$x_offset = 30,
$y_offset = 30,
$position="cc",
$bgpos = 5){
$logo_src ='./img/bg/wtm-'.$position[1].'-'.$textcolor.'.png';
$logo = ImageCreateFromPNG($logo_src);
$bg = ImageCreateFromPNG($bg_src);
$bgcrop = imagecreatetruecolor($width,$height);
$bgW = ImageSX($bg);
$bgH = ImageSY($bg);
if ($bgpos == 1||$bgpos == 2||$bgpos == 3){$src_y = 0;}
elseif ($bgpos == 4||$bgpos == 5||$bgpos == 6){$src_y = ($bgH - $height)/2;}
else{$src_y = $bgH - $height;}
if ($bgpos == 1||$bgpos == 4||$bgpos == 7){$src_x = 0;}
elseif ($bgpos == 2||$bgpos == 5||$bgpos == 8){$src_x = ($bgW - $width)/2;}
else{$src_x = $bgW - $width;}
imagecopyresized($bgcrop,$bg,0,0,$src_x,$src_y,$width,$height,$width,$height);
ImageDestroy($bg);
$logoW = ImageSX($logo);
$logoH = ImageSY($logo);
$strings = explode("\n", $string);
$color = ($textcolor == "b") ? imagecolorallocate($bgcrop, 0, 0, 0) : imagecolorallocate($bgcrop, 255, 255, 255);
if ($position[1]=="l"){$anchorX = $x_offset;}//Horiz. left
elseif($position[1]=="c"){$anchorX = $width / 2;} //Horiz. Center
elseif($position[1]=="r"){$anchorX = $width - $x_offset;} //Horiz Right
if ($position[0]=="t"){$anchorY = $y_offset;} //Vert. Top
elseif($position[0]=="c"){$anchorY = ($height / 2)-(($lineheight * count($strings) + $metalineh + 20+$logoH)/2);} //Vert. Center
elseif($position[0]=="b"){$anchorY = $height - ($lineheight * count($strings) + $metalineh + 20 + $logoH + $y_offset);} //Vert. Bottom
$lineacuu = $anchorY + $lineheight;
//imageline($bgcrop,0,($lineacuu),300,($lineacuu),$color);
foreach($strings as $line){
if ($position[1]=="l"){imagettftext($bgcrop, $size, 0, ($anchorX), ($lineacuu), $color, $font, $line);}//Horiz. left
elseif($position[1]=="c"){$this->imagettftext_ca($bgcrop, $size, 0, ($anchorX), ($lineacuu), $color, $font, $line);} //Horiz. Center
elseif($position[1]=="r"){$this->imagettftext_ra($bgcrop, $size, 0, ($anchorX), ($lineacuu), $color, $font, $line);} //Horiz Right
$lineacuu += $lineheight;
}
$lineacuu += $metalineh - $lineheight;
if ($position[1]=="l"){imagettftext($bgcrop, $metasize, 0, ($anchorX), ($lineacuu), $color, $font, $meta);}//Horiz. left
elseif($position[1]=="c"){$this->imagettftext_ca($bgcrop, $metasize, 0, ($anchorX), ($lineacuu), $color, $font, $meta);} //Horiz. Center
elseif($position[1]=="r"){$this->imagettftext_ra($bgcrop, $metasize, 0, ($anchorX), ($lineacuu), $color, $font, $meta);}
imageline($bgcrop,0,($lineacuu+10),1500,($lineacuu+10),$color);
ImageAlphaBlending($bgcrop, true);
if ($position[1]=="l"){$logoX = $x_offset;}//Horiz. left
elseif($position[1]=="c"){$logoX = $width / 2 - $logoW/2;} //Horiz. Center
elseif($position[1]=="r"){$logoX = $width - $x_offset - $logoW;}
ImageCopy($bgcrop, $logo, ($logoX), ($lineacuu + 20), 0, 0, $logoW, $logoH);
ImagePng($bgcrop);
}
public function imggen_db($img_id)
{
$fname = $this->config->item('fname');
$fpath = $this->config->item('fpath');
$post = $this->get_by_id($img_id);
$bgpath = "./img/bg/bg".$post->background.".png";
$this->imggen($post->lyric,
$post->size,
$post->lineheight,
str_replace($fname,$fpath,$post->font),
$post->meta,
$post->metasize,
$post->metalineh,
$bgpath,
$post->textcolor,
$post->width,
$post->height,
$post->x_offset,
$post->y_offset,
$post->style,
$post->bgpos);
}
完整代码可在https://github.com/1a23/project-gy
此代码在 CodeIgniter 框架中工作