PHP/arrays : Special condition in array -

i have booking search result array list users search form.

example : after search1 1 adult , 2 kids, users array :

array (     [0] => adult     [1] => kid     [2] => kid ) 

after second search : 2 adults , 1 kid :

array (     [0] => adult     [1] => kid     [2] => kid     [3] => adult     [4] => adult     [5] => kid ) 

after third search : 1 adult, 1 kid , 1 senior

array (     [0] => adult     [1] => kid     [2] => kid     [3] => adult     [4] => adult     [5] => kid     [6] => adult     [7] => kid     [8] => senior ) 

i'm trying save users id special conditions (we take our example):

for first search, increment ids:

• adult (key0) new > id take pax1
• kid (key1) new > id take pax2
• kid (key2) new > id take pax3

result : pax1, pax2, pax3

for other searchs, increment logic :

search2:

• adult (key3) exists in users array (key0) > id take pax1
• adult (key4) new > id take pax4
• kid (key5) exists in users array (key1)> id take pax2

result : pax1, pax2, pax3,pax1, pax2, pax4

search3:

• adult (key6) exists in users array (key0) > id take pax1
• kid (key7) exists in users array (key1) > id take pax2
• senior (key8) new > id take pax5

result : pax1, pax2, pax3, pax1, pax2, pax4, pax1, pax2, pax5

hope it's clear :)

my code wich increment id ($nblistepaxin users array) :

$nblistepaxin = array_count_values($tablistepaxall); $i = 1; foreach ($tablistepaxall $listein) { if ($listein == "enfant")     {     if (in_array("enfant", $tablistepaxall)) { $idpax = $i; }     else { $idpax = $i; }     } else     {     if (in_array("adulte", $tablistepaxall)) { $idpax = $i; }     else { $idpax = $i; }     }  echo "pax ".$idpax."<br>"; $i++; }