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<?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 ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 1 => 3, ), 1 => array ( 2 => 2, ), 2 => array ( 3 => 2, ), 3 => array ( 4 => 1, ), 4 => array ( 1 => 2, ), 5 => array ( 2 => 2, ), 6 => array ( 3 => 1, ), )

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