How to create transparent PNG images in PHP

This article mainly shares with you the method of creating transparent PNG images in PHP. I hope it can help you.

After verification, the code is as follows:

<?php
/*  *$sourePic:原图路径  * $smallFileName:小图名称  * $width:小图宽  * $heigh:小图高  */
function pngthumb($sourePic, $smallFileName, $width, $heigh){
    $image = imagecreatefrompng($sourePic);//PNG
    imagesavealpha($image,true);//这里很重要 意思是不要丢了$sourePic图像的透明色;
    $BigWidth=imagesx($image);//大图宽度
    $BigHeigh=imagesy($image);//大图高度
    $thumb = imagecreatetruecolor($width,$heigh);
    imagealphablending($thumb,false);//这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;
    imagesavealpha($thumb,true);//这里很重要,意思是不要丢了$thumb图像的透明色;
    if(imagecopyresampled($thumb,$image,0,0,0,0,$width,$heigh,$BigWidth,$BigHeigh)){
        imagepng($thumb,$smallFileName);
    }
    return $smallFileName;//返回小图路径
}
pngthumb("001.png", "test2.png", 300, 300);//调用
echo &#39;<p style="background-color: red;"><img src="test2.png"></p>&#39;;
?>

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