是用PHP switch语句这个正确的方式

Question

嗨，我是新的PHP 如何将邮件发送到PHP中所选城市与缺乏自信的电子邮件ID与$主题$消息$头

$selectcity = array("Bengaluru","Coimbatore","Chennai");                           
switch(trim($selectcity)) 
{ 
     case "Bengaluru": 
     { 
     $to = 'one@gmail.com''$subject''$message''$headers'; 
     break; 
     } 
     case "Coimbatore": 
     { 
     $to = 'two@gmail.com''$subject''$message''$headers'; 
       break; 
     } 
     case "Chennai": 
     { 
     $to = 'three@gmail.com''$subject''$message''$headers'; 
       break; 
     }  
    } 

Answer 1

装饰（）不支持数组。在switch语句中，应该放置一个选定的结果，而不是可用的选项。

参考：http://php.net/manual/en/function.trim.php

例子：

假设你有一个表格发送选择选项（例如下拉表单中箱）：

$selected = trim($_POST['ddb_city']); 
switch($selected) { 
    // the cases 
} 

此外，发送电子邮件，检查PHP（http://php.net/manual/en/function.mail.php）中的邮件（）函数。你当前的语法是错误的。

Answer 2

您无法打开阵列。你需要有一个特定的值来打开，就像数组中的一个元素一样。

$selectcity = array("Bengaluru","Coimbatore","Chennai");                           
$i=0; // this doesn't really make sense in the context, just used for the example 
switch(trim($selectcity[$i])) 
{ 
    case "Bengaluru": 
     $to = 'one@gmail.com'; 
     $subject="subject"; 
     $message="message"; 
     $headers="test"; 
     break; 

    case "Coimbatore": 
     $to = 'two@gmail.com'; 
     $subject="subject"; 
     $message="message"; 
     $headers="test"; 
     break; 
    case "Chennai": 
     $to = 'three@gmail.com'; 
     $subject="subject"; 
     $message="message"; 
     $headers="test"; 
     break; 
    default: 
     $to = 'four@gmail.com'; 
     $subject="subject"; 
     $message="message"; 
     $headers="test"; 
} 

Answer 3

您不需要每个case语句中的{}大括号。如果你从一个窗体中选择的城市，也许像下面这样将有助于：

<?php 
$selectedCity = $_GET['city']; 
switch(trim($selectedCity)) 
{ 
    case 'Chennai': 
     $to = "<contents>"; 
     break; 
    case 'Bengaluru': 
     $to = "<contents>"; 
     break; 
    default: // do whatever you want when they've selected something unexpected. 

     break; 
} 
?> 

Answer 4

$selectcity = array_map('trim',array("Bengaluru","Coimbatore","Chennai")); 

// the assumiing your value for city is coming form a form and you want to determine 
// address to send to  
switch($_POST['city'];) 
{ 
     case "Bengaluru": 
      $to = "'one@gmail.com''$subject''$message''$headers'"; 
      break; 

     case "Coimbatore": 
      $to = "'two@gmail.com''$subject''$message''$headers'"; 
      break; 

     case "Chennai": 
      $to = "'three@gmail.com''$subject''$message''$headers'"; 
      break; 

}