Question

尝试从foreach循环中的值创建一个字符串，确实没有更好的方法来执行此操作，但它没有设置字符串。我无法重置它以清空每一次迭代，因为我需要它继续，我已经阅读了重复的问题，他们没有回答为什么它不起作用，任何帮助表示赞赏< / p>

这个foreach只是循环检查并检查具有多个小时的企业的营业时间格式

$hoursSpliced = ['5:00 AM - 11:00 AM', '5:00 PM - 2:00 AM']

      $hoursFinal = '';
      foreach($hoursSpliced as $hour) {
        $hours = explode(' - ', $hour, 2);
        //If the hours match the format, we continue onward, no need to touch those
        if(preg_match($regex, $hour)) {
          $hoursFinal = $hoursFinal . $hour;
          continue;
        }
        //0 stores opening hours, 1 stores closing hours
        //Lower them so we can compare
        $hours[0] = strtolower(trim($hours[0]));
        $hours[1] = strtolower(trim($hours[1]));
        //If it's in the AM we add it to the end, same goes for PM, if there isn't one we assume it's PM
        if(strpos($hours[0], 'am') !== false) {
          $hoursOpen = array_map('trim', explode('am', $hours[0]));
          $hoursOpen[1] = 'am';
        } elseif(strpos($hours[0], 'pm') !== false) {
          $hoursOpen = array_map('trim', explode('pm', $hours[0]));
          $hoursOpen[1] = 'pm';
        } else {
          $hoursOpen = [$hours[0]];
          $hoursOpen[] = 'pm';
        }
        //Same thing as above for closing hours
        if(strpos($hours[1], 'am') !== false) {
          $hoursClosed = array_map('trim', explode('am', $hours[1]));
          $hoursClosed[1] = 'am';
        } elseif(strpos($hours[1], 'pm') !== false) {
          $hoursClosed = array_map('trim', explode('pm', $hours[1]));
          $hoursClosed[1] = 'pm';
        } else {
          $hoursClosed = [$hours[1]];
          $hoursClosed[] = 'pm';
        }
        $hoursFinal .= ", $hoursOpen[0] $hoursOpen[1] - $hoursClosed[0] $hoursClosed[1]";
      }
      $hoursFinal = trim(', ', $hoursFinal);
      dd($hoursFinal);

Answer 1

知道了，花了我一会儿你向后修剪了

  $hoursFinal = trim(', ', $hoursFinal);

应该是

   $hoursFinal = trim( $hoursFinal, ", ");

Foreach循环中的PHP编辑值

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