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@ 2014-02-27T11:55:12Z

<?php
$array=Array
(
"21" => Array
    (
        "0" => 3.5,
        "65" => Array
            (
                "0" => 44.125
            ),

        "150" => Array
            (
                "0" => 15.25
            ),

        "151" => Array
            (
                "0" => 17.333333333333
            )

    ),

"23" => Array
    (
        "0" => 0,
        "166" => Array
            (
                "0" => 26
            ),

        "172" => Array
            (
                "0" =>"" 
            ),

        "182" => Array
            (
                "0" => 20.333333333333
            ),

        "183" => Array
            (
                "0" => 24.125
            )

    )

);

   $count1 = 0;
    $count2 = 0;
    foreach ($array as $key3 => $value3) 
    {
      if($key3 == "21")
      {
        foreach ($value3 as $key => $value)
        {
          if (strpos($key, '0') === 0) {
            $count1++;
           }
           if(is_array($value))
           { 
             foreach($value as $key2=>$value2)
             {
               if(strpos($key2,'0') === 0)
               {
                 $count1++ ;
               }
             }
           }
        }
      }
      if($key3 == "23")
      {
        foreach ($value3 as $key => $value)
        {
          if (strpos($key, '0') === 0) {
            $count2++;
           }
           if(is_array($value))
           { 
             foreach($value as $key2=>$value2)
             {
               if(strpos($key2,'0') === 0)
               {
                 $count2++; 
               }
             }
           }
        }
      }
    }

echo $count1;

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 4

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