在 Laravel 中，怎么用接口直接返回一个 base64 的图片？

你这是嫌弃服务器性能太好了吗？还用php来解析图片，你是想做权限或者限制之类的吧，图片内容不要base64 在试试

return response(file_get_contents('a.jpg'), 200)->header('Content-Type', 'image/png');

后端还返回base64的字符串，js将字符串赋值给img标签的src属性中

Route::get('/', function () { $base64 = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAAOCAYAAAD5YeaVAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAuSURBVChTY/gPBG9OeP7//3wyQTyqGBnTRvGni3HEKwapoYNiwtgLopg48P8/AIn8Fjx9BN4NAAAAAElFTkSuQmCC'; return response($base64,200)->header('Content-Type','image/png'); });

验证了一下，可以显示图片啊

base64需要去除前缀

  $aa='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';
        return response(base64_decode($aa), 200)
            ->header('Content-Type', 'image/png');

看前面的回复，可能还会跟laravel版本有关。通用的话，先把图片base64后的那部分先解出来还原为原始数据再用原始数据输出

$img = base64_decode($base64data)
return response($img, 200)
    ->header('Content-Type', 'image/png');