在PHP中遍历三维数组

Question

I have an array of arrays that looks like this:

Array
 (
[0] => Array
    (
        [id] => 39
        [nume] => Ardeleanu
        [prenume] => Bogdan
        [crm] => Array
            (
            )

    )


[1] => Array
    (
        [id] => 40
        [nume] => Avram
        [prenume] => Corina
        [crm] => Array
            (
                [2014-02-27] => 2
                [2014-02-28] => 1
            )

    )
)

Here is my code :

foreach ($newOrders as $crm) {
   foreach ($crm as $angajati) {
      foreach ($angajati['crm'] as $val) {
        echo $val;
      }
   }
}

I getting the Warning:

Illegal string offset 'crm'.

What am I missing ?

Answer 1

You're trying to loop over whole 2-nd level array, but only crm key points to array. Thus, you need to do:

foreach ($newOrders as $crm) 
{
   if(isset($crm['crm']))
   {
     foreach ($crm['crm'] as $val) 
     {
          echo $val;
     }
   }
}

-if you want to get values in crm key. It may not exist, thus, I've added isset check.

Answer 2

Does it helps ?

foreach ($newOrders as $key=>$val) {
 if(array_key_exists("crm",$val) && count($val["crm"]) > 0 ){
   foreach($val["crm"] as $k=>$v){
     echo $k." = ".$v."<br />";
   }
 }
}

When we loop through a multi dimentional array its better to check if the keys are available if the corresponding values are again array and also to check if the array of values have some elements before doing loop.

So here first checking if "crm" is available and if the value ie again an array having some elements before doing a loop and its done by the line

if(array_key_exists("crm",$val) && count($val["crm"]) > 0 ){

This is done to avoid further notice like invalid index and invalid argument supplied in foreach if the element is missing or the data array is not present.