Array da json

[clasku]

prova così

<?php 
foreach($count_lst as $lts){
    for($x = 0; $x < count($lts->features->externals); $x++){
        if (($lts->features->externals[$x]->id) == 15) { 
           $giardino = ($lts->features->externals[$x]->size);
           $giardino = number_format($giardino, 0, ',', '.');
           // stampa il "giardino"
          echo $lts->id . " - <br>Giardino: " . $giardino ."<br>";
       } 
    }
    /* eliminare
    echo $lts->id . " - <br>Giardino: " . $giardino ."<br>";
   */
}