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php - 如何从函数内部的foreach循环生成的最后一项中删除最后一个逗号

问题描述

我已经看到了一些类似的问题 - 答案，但我还没有设法做到这一点。有些人建议你用逗号内爆数组，但我不知道在那种特定情况下实现内爆（即使是可能的）。我试图遵循最简单的路径，只删除回显的 html 的第 12 个字符（那个该死的逗号），但我无法将函数本身存储到变量中。我会很感激任何帮助，谢谢！

<?php
  function jsonbreadcrumbs($home = 'Home') {
  $itemNumber = 1;
  $jsonbreadcrumb .= '<script type="application/ld+json">';
  $jsonbreadcrumb .= '{';
  $jsonbreadcrumb .= '"@context": "http://schema.org",';
  $jsonbreadcrumb .= '"@type": "BreadcrumbList",';
  $root_domain = ($_SERVER['HTTPS'] ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'].'/';
  $jsonbreadcrumbs = array_filter(explode('/', parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)));
  $jsonbreadcrumb .= '"itemListElement": [{';
  $jsonbreadcrumb .= '"@type": "ListItem",';
  $jsonbreadcrumb .= '"position":' .$itemNumber++.',';
  $jsonbreadcrumb .= "\"name\": \"{$home}\",";
  $jsonbreadcrumb .= "\"item\": \"{$root_domain}\"},";
  foreach ($jsonbreadcrumbs as $crumb) {
    $link = ucwords(str_replace(array(".php","-","_"), array(""," "," "), $crumb));
    $root_domain .=  $crumb . '/';
    $jsonbreadcrumb .= '{"@type": "ListItem",';
    $jsonbreadcrumb .= '"position":' . $itemNumber++ . ',';
    $jsonbreadcrumb .= "\"name\": \"{$link}\",";
    $jsonbreadcrumb .= "\"item\": \"{$root_domain}\"},";//<---this last comma,when it belongs to the last item, needs to be removed.
    }
  $jsonbreadcrumb .= ']}</script>';
  return $jsonbreadcrumb;
}
echo jsonbreadcrumbs();
?>

标签： phpjsonfunctionjson-ld

解决方案

只需使用您自己的字符列表trim()它

  foreach ($jsonbreadcrumbs as $crumb) {
    $link = ucwords(str_replace(array(".php","-","_"), array(""," "," "), $crumb));
    $root_domain .=  $crumb . '/';
    $jsonbreadcrumb .= '{"@type": "ListItem",';
    $jsonbreadcrumb .= '"position":' . $itemNumber++ . ',';
    $jsonbreadcrumb .= "\"name\": \"{$link}\",";
    $jsonbreadcrumb .= "\"item\": \"{$root_domain}\"},";//<---this last comma,when it belongs to the last item, needs to be removed.
    }
  $jsonbreadcrumb=trim($jsonbreadcrumb,","); // this removes that trailing comma... 
  $jsonbreadcrumb .= ']}</script>';

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