PHP List in order

I have to develop a website, and im doing great so far i just dont have any php experience.

I have a .json file that is ment to contain data for a leaderboard for a game. This file is already existing and reads(its likely the array will grow):

[{"name":"Star Explorers","score":"6800.0"},{"name":"admin-test","score":"6500.5713"},{"name":"CARACOL","score":"9036.0"}]

I need the data to display in order from highest to lowest score:

1 : CARACOL - 9036.0 FP
2 : Star Explorers - 6800.0FP
etc

How would I get this to display correctly on a web page?

Algoritmo "Caracol"
// Disciplina: [Linguagem e Lógica de programaçao]
// Professor: Antonio Carlos Nicolodi
// Função: Calcula os passos de um caracol para subir o poço
// Autor : Professor Antonio
// Data : 05/04/2015
Var
Sobe, Desce: Real
Dias, Total : Inteiro

Inicio
Sobe <- 0.0
Desce <- 0.5
Dias <- 0
Total <- 10
Limpatela
Escreval("Cálcular os passos de um Caracol")
Escreval("================================")
Escreval(" ")
Para Dias de 0 ate Total faca
se Sobe <= Total entao
Sobe <- Sobe + 2 - Desce
Escreval("Sobe = ",Sobe)
senao
interrompa
fimse
fimpara

    Escreval(" ")
    Escreval("O Caracol levou ",Dias," dias")
    Escreval(" ")

fimAlgoritmo