How to convert svg to png in php

php method to convert svg to png: first convert svg to canvas through the "drawInlineSVG" method; then use the "base64_image_content" method to convert canvas into png.

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svg to png implementation

1.php imagick extension plug-in

a. Study the imagick plug-in method

$im = new Imagick($upload_path . $file_name);
$svg = file_get_contents($upload_path . $file_name);
$svg = ''.$svg;
$im->readImageBlob($svg);

// png settings
$im->setImageFormat("png24");
$srcImage = $im->getImageGeometry(); //获取源图片宽和高
$im->resizeImage($srcImage['width'], $srcImage['height'], imagick::FILTER_LANCZOS, 1, false);

$im->writeImage($upload_path.'/'.$topng_name.'.png');
$im->clear();
$im->destroy();

b. Problems encountered

svg pictures can be successfully converted into png format pictures, but png pictures There are problems:

1) Line segments are missing;

2) Fonts are not displayed;

3) The style tag style in the svg file cannot be parsed;

2 .Abandon the imagick plug-in and change it to svg to canvas to png

a.svg to canvas

function drawInlineSVG($svg, callback) {
    var svg = $svg;

    var parser = new DOMParser();
    var doc = parser.parseFromString(svg, "text/xml");
    svg = doc.getElementsByTagName('svg');
    svg = svg[0];

    svg.innerHTML = '' + svg.innerHTML;
    var svgData = new XMLSerializer().serializeToString( svg );

    var img = document.createElement( "img" );
    img.setAttribute( "src", "data:image/svg+xml;base64," + btoa( unescape(encodeURIComponent(svgData)) ) );
    img.onload = function () {
        var canvas = document.createElement( "canvas" );

        canvas.width = img.width;
        canvas.height = img.height;
        var ctx = canvas.getContext( "2d" );  //取得画布的2d绘图上下文
        ctx.drawImage( img, 0, 0 );
        canvas.toDataURL( "image/png" );
        var base64Src = canvas.toDataURL( "image/png" );
        callback && callback(base64Src); // 调用回掉函数
    };
	return;
}

b.canvas to png (base64Src converted to png)

/* base64格式编码转换为图片并保存对应文件夹 */
function base64_image_content($base64_image_content,$path, $file_name = ''){
    //匹配出图片的格式
    if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
        if(!file_exists($path)){
            // 路径不存在
        	return false;
        }
        $new_file = $path . $file_name;
        if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
            return '/'.$new_file;
        }else{
            return false;
        }
    }else{
        return false;
    }
}

c .Effect examples

1) svg format

2) png format

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