用於合併兩個圖標的PHP GD

Question

我使用PHP GD庫將兩個圖標合併爲一個。但在其中一種情況下，較小的圖標進入後面，較大的圖標完全重疊，我需要將小圖標放在最上面。

這裏是我的合併兩個圖標， MergeIcons.php代碼

$firstIcon = $_GET['icon1']; 
$secondIcon = $_GET['icon2']; 

    $image = imagecreatefrompng($firstIcon); 

    $x1 = -1; 
    $y1 = -1; 

    $i = 0; 

    $xCords = array(); // Array to save non-transperent x cords 
    $yCords = array(); // Array to save non-transperent y cords 

    for($x=0;$x<16;$x++) 
    { 
      for($y=0;$y<16;$y++) 
     { 
       if (!transparent(imagecolorat($image, $x, $y))) 
     { 
       $xCords[$i] = $x; 
     $yCords[$i] = $y; 
     $i++; 
       } 
      } 
    } 

    $minX = min($xCords); 
    $minY = min($yCords); 

    $width = 16 - $minX; 
    $height = 16 - $minY; 

$canvas = imagecreatetruecolor(16,16); 
$col = imagecolorallocatealpha($canvas,0,0,0,127); 
imagefilledrectangle($canvas,0,0,16,16,$col); 
imagealphablending($canvas, true); 
imagesavealpha($canvas, true); 
imagefill($canvas, 0, 0, $col); 

imagecopy($canvas, $image, 0, 0, $minX , $minY, $width, $height); 

    $dest = $canvas; 
    $src = imagecreatefrompng($secondIcon); 

    imagealphablending($dest, true); 
    imagesavealpha($dest, true); 

    $swidth = imagesx($src); 
    $sheight = imagesy($src); 

    imagecopy($dest, $src, 0,0,0,0,$swidth,$sheight); 

    header('Content-Type: image/png'); 
    imagepng($dest); 

    imagedestroy($dest); 
    imagedestroy($src); 

    function transparent($pixelValue) 
    { 
     $alpha = ($pixelValue & 0x7F000000) >> 24; 
     $red = ($pixelValue & 0xFF0000) >> 16; 
     $green = ($pixelValue & 0x00FF00) >> 8; 
     $blue = ($pixelValue & 0x0000FF); 

     if($alpha == 127) 
    return true; 
     else 
    return false; 
    } 

這裏是我所說的mergeicons.php

echo '<li><a href="MergeIcons.php?icon1='.$secondIconPath.'&icon2='.$firstIconPath.'" download="'.$IconNameQuery.'"><img src="MergeIcons.php?icon1='.$secondIconPath.'&icon2='.$firstIconPath.'"/></a></li>'; 

在這種情況下，第二個圖標是一個小圖標並且第一個圖標是較大的圖標，我想在較大的圖標頂部放置較小的圖標（假設它像「將它放在前面」一樣）。

這可能嗎？

Answer 1

「把它前面的」 - 我想你想要把一個圖像作爲其他

http://phpimageworkshop.com/