PHP foreach多维数组上的循环 [英] PHP foreach loop on multi dimensional array

问题描述

对于多维数组有一点困难。我缩短了它，但数组看起来像这样

  array（192）{
 [count] = > int（191）
 [0] => array（124）{
 [11] => string（10）usnchanged
 [homemta] => array 2）{
 [count] => int（1）
 [0] => string（206）Some String
} 
 [12] = > string（7）homemta
 [proxyaddresses] =>数组（2）{
 [count] => int（1）
 [0] = > string（46）SMTP：remove=[e-mail]
} 
} 
} 
} 
  pre> 
 
 
我正在尝试获取将在proxyaddresses下列出的电子邮件地址。我现在正在做的是：
 
 $ p $  for（$ i = 0; $ i <$ data [count ; $ i ++）{
 foreach（$ data [$ i] [proxyaddresses] as $ object）{
 print_r（$ object）; 
 
 
 
 
 
 
这是我所需要的数据，我得到了很多警告的数据，例如
 
lockquote 
 
注意：未定义的索引：index.php中的proxyaddresses在88行
 
 
 
 $ b 
 
 
 
 
 <所以我认为它不喜欢的东西。如何根据上面的数组结构正确地做循环？
 
 
 
谢谢 
 
解决方案
这是因为每个循环都不存在proxyaddresses元素。你必须检查是否设置或不要使用php  isset（）函数来避免警告。 
 
 
 if（isset（$ data [$ i] [proxyaddresses]）） {
 foreach（$ data [$ i] [proxyaddresses]作为$ object）{
 print_r（$ object）; 
} 
} 
} 
  
 
having a bit of difficulty with a multi-dimensional array.  I have shortened it, but the array looks like this
array(192) {
    ["count"]=> int(191)
        [0]=>array(124) {
            [11]=>string(10) "usnchanged"
                ["homemta"]=>array(2) {
                  ["count"]=>int(1)
                  [0]=>string(206) "Some String"
                }
            [12]=>string(7) "homemta"
                ["proxyaddresses"]=>array(2) {
                  ["count"]=>int(1)
                  [0]=>string(46) "SMTP:remove=[e-mail]"
                }
        }
    }
}
I am trying to get the email addresses which will be listed under proxyaddresses.  What I am doing at the moment is the following:
for($i=0; $i<$data["count"]; $i++) {
    foreach($data[$i]["proxyaddresses"] as $object) {
        print_r($object);   
    }
}
This gets me the data I need, but inbetween all the data I get a lot of warnings like 

  
Notice:  Undefined index: proxyaddresses in index.php on line 88
  
  
Warning:  Invalid argument supplied for foreach() in index.php on line
  88
So I presume it is not liking something. How would I properly do the loop based on the above array structure?

Thanks
解决方案
It's because proxyaddresses element is not present for each loop. You have to check if it's set or not to avoid warning by using php isset() function.
for($i=0; $i<$data["count"]; $i++) {
  if(isset($data[$i]["proxyaddresses"])){
    foreach($data[$i]["proxyaddresses"] as $object) {
      print_r($object);   
    }
  }
}


                        
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