在一个自定义快捷码函数中，我获取了特色图像URL：

$text_slider_testimonial_img = get_the_post_thumbnail_url($single->ID);

如果我回音$text_slider_testimonial_img 我立即看到正确的图像URL：//localhost:3000/wp-content/uploads/2021/03/splitbanner1.jpg

当我将此变量传递给函数时，该函数使用：

$text_slider_content .= "<div class=\'text_slider_testimonial\' style=\'background-size: cover; background-image: url(\'". $text_slider_testimonial_img ."\')>";
return $text_slider_content;    

上述样式组件输出为：

style="background-size: cover; background-image: url(" localhost:3000="" wp-content="" uploads="" 2021="" 03="" splitbanner1.jpg\')="">

为什么要删除斜杠="" 正在添加？

感谢您的帮助。

Here is the wider code context (pastebin.com).

$text_slider_content .= \'<div class="text_slider_testimonial" style="background-size: cover; background-image: url(\'. $text_slider_testimonial_img .\');">\';

$text_slider_content .= "<div class=\'text_slider_testimonial\' style=\'background-size: cover; background-image: url($text_slider_testimonial_img);>";