空（）在一个循环中

Question

比方说，我想检查，看是否有变量是空的，然后做一些PHP援助......我可以这样做：

if (empty($phone)) { $phone = 'Not Provided'; } 

但我想这样做一堆物品。所以我想这样的数组和一个循环，所以东西：

$optionalFieldsArray = array($phone, $address, $city, $state, $zip); 

foreach ($optionalFieldsArray as $value) { 
     //what goes here???? 
    } 

这是一个的foreach合理的方式做到这一点，在那里我可以检查是否$电话，地址$，$城市等都是清空并分配“未提供”字符串，当它是？

如果是这样，有人可以帮助我使用循环内部的语法吗？

Answer 1

，你可以这样做此：

<?php 

$required_vars = array('phone', 'address', 'city', 'state', 'zip'); 
foreach($required_vars as $required_var) { 
    if(empty($$required_var)) 
     $$required_var = 'Not Provided'; // $$var -> variable with name = value of $var 
} 

?> 

检查上面的代码自己。那么只有你可以理解它是如何工作的。因为这是混淆概念。

Answer 2

$optionalFieldsArray = array('phone'=>$phone, 'address'=>$address, 'city'=>$city, 'state'=>$state, 'zip'=>$zip); 

foreach ($optionalFieldsArray as $key => $value) { 
    if (empty($value)) { $optionalFieldsArray[$key] = 'Not Provided'; } 
} 

echo "<pre>"; 
print_r($optionalFieldsArray); 
echo "</pre>"; 

Answer 3

我会这样说 -

$optionalFieldsArray = array($phone, $address, $city, $state, $zip); 

foreach ($optionalFieldsArray as $key => $value) { 
     if (empty($optionalFieldsArray[$key])) { 
      $optionalFieldsArray[$key] = 'Not Provided'; 
     } 
} 

Answer 4

结合您提供的两个代码示例，并使用字符串作为可选的阵列中的键：

$optional = array(
    'phone' => $phone, 
    'address' => $address, 
    'city' => $city, 
    'state' => $state, 
    'zip'  => $zip, 
); 
foreach ($optional as $type => $value) { 
    if ($value == null) { 
     echo "The {$type} field is empty!<br>"; 
    } 
} 

Answer 5

$optionalFieldsArray = array($phone, $address, $city, $state, $zip); 

foreach($optionalFieldsArray as $k => $v) { 
    // you could check for !empty here if you wanted too 
    $optionalFieldsArray[$k] = empty($v) ? 'Not Provided' : $v; 
} 

print_r($optionalFieldsArray); 

Input Vars: 
$phone = "1234567899"; 
$address = ""; 
$city = ""; 
$state = ""; 
$zip = ""; 
Output: 
Array ([0] => 1234567899 [1] => Not Provided [2] => Not Provided [3] => Not Provided [4] => Not Provided)