contar numero de input type file enviados en un formulario

[pbt]

array(1)
{
["foto"]=> array(5)
{ ["name"]=> array(3)
{ [0]=> string(22) "52401,1165354158,1.jpg"
[1]=> string(23) "191008,1223759768,2.jpg"
[2]=> string(23) "146584,1224168971,9.jpg" }
["type"]=> array(3)
{ [0]=> string(10) "image/jpeg"
[1]=> string(10) "image/jpeg"
[2]=> string(10) "image/jpeg" }
["tmp_name"]=> array(3)
{ [0]=> string(21) "C:\wamp\tmp\php7A.tmp"
[1]=> string(21) "C:\wamp\tmp\php7B.tmp"
[2]=> string(21) "C:\wamp\tmp\php7C.tmp" }
["error"]=> array(3)
{ [0]=> int(0)
[1]=> int(0)
[2]=> int(0) }
["size"]=> array(3)
{ [0]=> int(95437)
[1]=> int(33562)
[2]=> int(59793) }
}
}