Foreach 循环仅执行第一个值并返回，但返回所有值并回显答案

【问题标题】：Foreach loop executes only first value with return, but returns all values with echoForeach 循环仅执行第一个值并返回，但返回所有值并回显
【发布时间】：2018-06-01 11:12:55
【问题描述】：

我正在尝试使用affiliatewp 创建会员排行榜。我能够获得我想要的每一个值，但是，在我使用的函数中，我使用了一个 foreach 循环来调用每个附属公司并显示当月的“销售额”。

function affiliate_leaderboard_function() {
global $wpdb;

$getallreferrals = $wpdb->get_results( "SELECT * FROM `wp_affiliate_wp_referrals`");
$getallaffiliates = $wpdb->get_results( "SELECT * FROM `wp_affiliate_wp_affiliates`");
$current_month = get_the_date("m");
$current_year = get_the_date("Y");
$current_date = get_the_date("Y-m-d");
$lastday = date('t',strtotime($current_date));

foreach ($getallaffiliates as $theaffiliate) {
    $user_id = get_userdata( $theaffiliate->user_id );
    $userfirstname = $user_id->first_name;
    $userlastname = $user_id->last_name;
    $totalreferrals = $theaffiliate->referrals;
    $affiliate_id = $theaffiliate->affiliate_id;
    $getaffreferrals = $wpdb->get_results( "SELECT `date` FROM `wp_affiliate_wp_referrals` WHERE `affiliate_id` = $affiliate_id AND `date` >= '$current_year-$current_month-01:00:00:00' AND `date` < '$current_year-$current_month-$lastday:23:59:59' ORDER BY `wp_affiliate_wp_referrals`.`referral_id` ASC");//Get all referrals by affiliate id
    $closerstring = $userfirstname." | This Month's Sales: ".count($getaffreferrals)."<br>";
    if(!empty($getaffreferrals)){
        echo $closerstring;
    }
}
}
add_shortcode('affiliate_leaderboard' , 'affiliate_leaderboard_function');

所以当我放置短代码并使用“echo $closerstring”时，它会吐出所有正确的数据，用户的名字后跟他们当月的销售额。但是内容顶部的简码输出。

当我将它切换到“return $closerstring”时，它只返回一个附属而不是 foreach 循环中的所有附属。我不知道如何让它像 echo 函数那样显示所有值，但我需要它出现在正确的位置......

【问题讨论】：

标签： php wordpress foreach affiliate

【解决方案1】：

在forloop中，如果你写return，那么循环在第一次运行时退出。相反，使用变量将您的代码更改为

$return = '';
foreach ($getallaffiliates as $theaffiliate) {
$user_id = get_userdata( $theaffiliate->user_id );
$userfirstname = $user_id->first_name;
$userlastname = $user_id->last_name;
$totalreferrals = $theaffiliate->referrals;
$affiliate_id = $theaffiliate->affiliate_id;
$getaffreferrals = $wpdb->get_results( "SELECT `date` FROM `wp_affiliate_wp_referrals` WHERE `affiliate_id` = $affiliate_id AND `date` >= '$current_year-$current_month-01:00:00:00' AND `date` < '$current_year-$current_month-$lastday:23:59:59' ORDER BY `wp_affiliate_wp_referrals`.`referral_id` ASC");//Get all referrals by affiliate id
$closerstring = $userfirstname." | This Month's Sales: ".count($getaffreferrals)."<br>";
if(!empty($getaffreferrals)){
    $return_array.= $closerstring;
}
}

return $return_array;

【讨论】：

【解决方案2】：

return 中断函数的执行。

您需要将输出保存在字符串中并在最后返回，如下所示：

[...]
    $output= '';
    foreach ($getallaffiliates as $theaffiliate) {
        [...]
        if(!empty($getaffreferrals)){
            $output .= $closerstring;
        }
    }
    return $output;
}

【讨论】：

【解决方案3】：

在每个循环之后构建你的字符串，而不是 echo 然后 return 它在最后：

$result = ""; // Create an empty string

foreach ($getallaffiliates as $theaffiliate) {
  $user_id = get_userdata( $theaffiliate->user_id );
  $userfirstname = $user_id->first_name;
  $userlastname = $user_id->last_name;
  $totalreferrals = $theaffiliate->referrals;
  $affiliate_id = $theaffiliate->affiliate_id;
  $getaffreferrals = $wpdb->get_results( "SELECT `date` FROM `wp_affiliate_wp_referrals` WHERE `affiliate_id` = $affiliate_id AND `date` >= '$current_year-$current_month-01:00:00:00' AND `date` < '$current_year-$current_month-$lastday:23:59:59' ORDER BY `wp_affiliate_wp_referrals`.`referral_id` ASC");//Get all referrals by affiliate id
  $closerstring = $userfirstname." | This Month's Sales: ".count($getaffreferrals)."<br>";
  if(!empty($getaffreferrals)){
    $result .= $closerstring; // Add the data
  }
}

return $result; // you return the full string

【讨论】：

【解决方案4】：

追加字符串并返回。

    function affiliate_leaderboard_function() {
    global $wpdb;

        $getallreferrals = $wpdb->get_results( "SELECT * FROM `wp_affiliate_wp_referrals`");
        $getallaffiliates = $wpdb->get_results( "SELECT * FROM `wp_affiliate_wp_affiliates`");
        $current_month = get_the_date("m");
        $current_year = get_the_date("Y");
        $current_date = get_the_date("Y-m-d");
        $lastday = date('t',strtotime($current_date));

        $returnstring='';
        foreach ($ge1tallaffiliates as $theaffiliate) {
          $user_id = get_userdata( $theaffiliate->user_id );
          $userfirstname = $user_id->first_name;
          $userlastname = $user_id->last_name;
          $totalreferrals = $theaffiliate->referrals;
          $affiliate_id = $theaffiliate->affiliate_id;
          $getaffreferrals = $wpdb->get_results( "SELECT `date` FROM `wp_affiliate_wp_referrals` WHERE `affiliate_id` = $affiliate_id AND `date` >= '$current_year-$current_month-01:00:00:00' AND `date` < '$current_year-$current_month-$lastday:23:59:59' ORDER BY `wp_affiliate_wp_referrals`.`referral_id` ASC");//Get all referrals by affiliate id
       $closerstring = $userfirstname." | This Month's Sales: ".count($getaffreferrals)."<br>";
        if(!empty($getaffreferrals)){
            $returnstring .=$closerstring;
           }
       }
           return $returnstring;
    }
    add_shortcode('affiliate_leaderboard' , 'affiliate_leaderboard_function');

【讨论】：