Question

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 

if ( ! function_exists('image_thumb')){
    function image_thumb($courseBanner, $userId){
        $CI =& get_instance();
        $filename_ext = pathinfo($courseBanner, PATHINFO_EXTENSION);
        $course_thumb_Banner = preg_replace('/^(.*)\.' . $filename_ext . '$/', '$1_thumb.' . $filename_ext, $courseBanner);
        $url =  base_url()."private/".$userId."/".$course_thumb_Banner;
        $headers=get_headers($url);
        $is_banner_there  =  stripos($headers[0],"200 OK")?true:false;
        $url = ($is_banner_there)?$url: base_url()."public/images/placeholder.jpg";
        return $url;
    }
}

在上面的代码中，有时$ courseBanner没有来，所以我想发送这个base_url()."public/images/placeholder.jpg怎么办？

Answer 1

建议：

我认为如果字符串（例如$ courseBanner）为空，您可以设置默认值

示例：

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); if ( ! function_exists('image_thumb')){ function image_thumb($userId, $courseBanner = ''){ $CI =& get_instance(); $courseBanner = !empty($courseBanner) ? $courseBanner : base_url()."public/images/placeholder.jpg"; $filename_ext = pathinfo($courseBanner, PATHINFO_EXTENSION); $course_thumb_Banner = preg_replace('/^(.*)\.' . $filename_ext . '$/', '$1_thumb.' . $filename_ext, $courseBanner); $url = base_url()."private/".$userId."/".$course_thumb_Banner; $headers=get_headers($url); $is_banner_there = stripos($headers[0],"200 OK")?true:false; return $url; } }

这仅供参考，希望对此有所帮助

当一个论点没有起作用时该怎么办？

1 个答案: