php - How to loop trought array and create array from common values? [Solved] -

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i need filter array , spilt them different arrays. here actual working , slow code: 

 -----> http://viper-7.com/gvrbvp

but method still slow, think. @ least 3 loops... scan 1 time array , create array on fly, tried this: 

$stray = json_decode('[{"id":"1","zona":"pescara"},{"id":"2","zona":"pescara"},{"id":"3","zona":"teramo"},{"id":"4","zona":"pescara"},{"id":"5","zona":"pescara"},{"id":"6","zona":"teramo"},{"id":"7","zona":"pescara"},{"id":"8","zona":"pescara"},{"id":"9","zona":"pescara"},{"id":"10","zona":"pescara"},{"id":"11","zona":"pescara"},{"id":"12","zona":"pescara"},{"id":"13","zona":"teramo"},{"id":"14","zona":"chieti"},{"id":"15","zona":"chieti"},{"id":"16","zona":"aquila"},{"id":"17","zona":"chieti"},{"id":"18","zona":"chieti"},{"id":"19","zona":"chieti"},{"id":"20","zona":"chieti"},{"id":"21","zona":"campobasso"},{"id":"22","zona":"aquila"},{"id":"23","zona":"pescara"},{"id":"24","zona":"pescara"},{"id":"25","zona":"pescara"},{"id":"26","zona":"pescara"},{"id":"27","zona":"chieti"},{"id":"28","zona":"pescara"},{"id":"29","zona":"pescara"},{"id":"30","zona":"chieti"},{"id":"31","zona":"pescara"},{"id":"32","zona":"chieti"},{"id":"33","zona":"teramo"},{"id":"34","zona":"teramo"},{"id":"35","zona":"teramo"},{"id":"37","zona":"teramo"},{"id":"39","zona":"pescara"}]',true);  $all_cat = array(); foreach($stray $row) {     $item_cat = $row['zona'];     if($$cat) {                                   /* check if category array exist */         $cat = array();                           /* if not, create array */         if( !in_array($item_cat,$$item_cat) ) {   /* , add value */             array_push($$item_cat,$row);         }         array_push($all_cat, $cat);               /* add new category index of categories */     } else {         if( !in_array($item_cat,$$item_cat) ) {   /* otherwise add value */             array_push($$item_cat,$row);         }     }  }  echo '<pre>'.print_r($cat,true).'</pre>';

if understand correctly, simplify 

foreach($stray $row) {         if(!isset($$row['zona'])) {             $$row['zona']=array();         }         ${$row['zona']}[] = $row; }

so viper-7 like

$stray = json_decode(...[removed simplify]...,true);  foreach($stray $row) {         if(!isset($$row['zona'])) {             $$row['zona']=array();         }         ${$row['zona']}[] = $row; }       echo 'pescara :<pre style="max-height: 50px; overflow: auto">'.print_r($pescara,true).'</pre>';     echo 'teramo :<pre style="max-height: 50px; overflow: auto">'.print_r($teramo,true).'</pre>';     echo 'chieti :<pre style="max-height: 50px; overflow: auto">'.print_r($chieti,true).'</pre>';     echo 'aquila :<pre style="max-height: 50px; overflow: auto">'.print_r($aquila,true).'</pre>';     echo 'campobasso :<pre style="max-height: 50px; overflow: auto">'.print_r($campobasso,true).'</pre>';

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