php - Arrange parent-child relationship -

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i have read build tree flat array in php , convert series of parent-child relationships hierarchical tree? not figure out how implement problem. there pairs of relations such:

array (     [0] => catalog.iden = catalog_sub.parent     [1] => catalog.group = catalog_group.iden     [2] => catalog_photo.iiden = catalog.iden )

i have not null, or 0, or explicit condition stop looping. know field has primary key auto_increment attribute. in example field named 'iden' in relation "parent".

i have spent week resolve problem no result. me arrange array in order of relations. may tree of flat array.

thanks in advance.

update

so far managed so:

foreach($matches[0] &$match) {     $ref  = explode('=', $match); // split = sign     $lft = explode('.', $ref[0]);     $rgt = explode('.', $ref[1]);      if($lft[1] == 'iden') {         $arr[$lft[0]][$rgt[0]] = $rgt[1];     } else {         $arr[$rgt[0]][$lft[0]] = $lft[1];     } }

what gives sorting primary key , grouping used tables:

array ( [catalog] => array     (         [catalog_sub] => parent         [catalog_photo] => iiden     )  [catalog_group] => array     (         [catalog] => group     )  )


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