将透明图像合并为一个使用GD保持透明

Question

我有一个透明的图像和比图像更宽的文字，我试图在透明图像顶部嵌入文本，并获得最终透明PNG图像，我有所产生的透明文本作为与该宽度和高度的容器，但是当与图像结合它带有一个黑色背景

function createImageServer($name, $state) 
{ 
    $path = 'js/FusionCharts/FusionCharts_XT_Website/Charts/Resources/'; 
    $server = $path . 'server' . $state . '.png'; 

    list($width, $height, $type, $attr) = getimagesize($server); 

    $font_path = 'images_machines/FreeSans.ttf'; 

    $bbox = imagettfbbox(10,0,$font_path,$name); 

    $diffHeight = 5; 

    $fontHeight = ($bbox[1] - $bbox[7]) + $diffHeight; 
    $textWidth = $bbox[2] + $bbox[0]; 

    $dstimage = imagecreatetruecolor($textWidth,$height + $fontHeight); 
    imagealphablending($dstimage, false); 

    //Create alpha channel for transparent layer 
    $col=imagecolorallocatealpha($dstimage,255,255,255,127); 
    imagefilledrectangle($dstimage,0,0,$textWidth, $height+$fontHeight,$col); 
    imagealphablending($dstimage,true); 
    imagefttext($dstimage,10,0,0,$fontHeight-$diffHeight,0,$font_path,$name); 


    $srcimage = imagecreatefrompng($server); 
    imagealphablending($srcimage, false); 

    imagecopymerge($dstimage,$srcimage,($textWidth/2)-($width/2),$fontHeight,0,0,$width,$height,100); 
    imagealphablending($dstimage, true); 
    imagesavealpha($dstimage, true); 

    $pathImage = 'images_machines/' . $name . '.png'; 


    imagepng($dstimage,$pathImage); 

    imagedestroy($dstimage); 
    imagedestroy($srcimage); 

    return $pathImage; 
} 

原始图像：

得到的图像：

Answer 1

更换您的来电imagecopymerge与imagecopy（改变函数名并删除最后一个参数）：

//imagecopymerge($dstimage,$srcimage,($textWidth/2)-($width/2),$fontHeight,0,0,$width,$height,100); 

imagecopy($dstimage,$srcimage,($textWidth/2)-($width/2),$fontHeight,0,0,$width,$height); 

结果：