<?php $array = [1,1,1,2,2,3,3,4,1,1,2,2,3]; var_export( json_decode( preg_replace_callback( '/\b(\d+)(?:,\1)*\b/', function($m) { return sprintf( '{"%d":%d}', $m[1], count(explode(',', $m[0])) ); }, json_encode($array) ), true ) );
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