php - How to implement implode in foreach? -

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here trying add comma in values got foreach loop. values coming together, want echoed comma separated. please suggest me gotta . know, gotta use implode, don't know how in loop.

foreach($_post['insert'] $interested) {     if(!preg_match('/^[-a-z0-9\., ]+$/id', $interested)) continue;          echo $interested;      }

if want leave code relatively untouched (though fixed confusing indentation)...

$interestedvalues = array();  foreach($_post['insert'] $interested) {     if(!preg_match('/^[-a-z0-9\., ]+$/id', $interested)) continue;       $interestedvalues[] = $interested;  }  echo implode(',', $interestedvalues);

...or 1 liners seem fashionable...

echo implode(',', preg_grep('/^[-a-z\d., ]+$/id', $_post['insert']));

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