如何在下一個項目的查詢中添加逗號？

Question

如何在下一個項目的查詢中添加逗號？在問題中添加更多詳細信息。

// Indented the codes to make it more readable 
$participants = [602, 600]; 

$query  = array(); 
$query[] = 'INSERT INTO ' . 
      $db->nameQuote('#__social_conversations_participants'); 
$query[] = '(' . $db->nameQuote('conversation_id') .',' . 
      $db->nameQuote('user_id') . ',' . $db->nameQuote('state') . ')'; 
$query[] = 'VALUES'; 
foreach($participants as $userId){ 
    $query[] = '(' . $db->Quote($conversationId) . ',' . 
        $db->Quote($userId) . ',' . $db->Quote(1) . ')'; 

//這是行不通的，因爲下一個（）在這種情況下總是返回 假

// Indented the codes to make it more readable 
    if(next($participants) !== false){ 
     $query[] = ','; 
    } 
} 
// Glue query back. 
$query = implode(' ' , $query); 
var_dump($query);exit; 

Answer 1

發現從這裏的解決方案：PHP: Insert separated comma string value with as multiple array value Into MySql

<?php 
    $myString = "Red,Blue,Black";// incoming string comma names 
    $myArray = explode(',', $myString); 
    print_r($myArray); 
    $sql = "INSERT INTO `cat_interest`(`id`,`categories`) VALUES"; 
    foreach($myArray as $value){ 
     $sql .= " (1, '{$value}'),"; 
    } 
    echo rtrim($sql, ',');