Just like Bitcoin, the price of XRP is determined by the market demand and set by those who buy and sell it. Coins.ph does not control the price of XRP.
To see the current buy/sell rate for XRP, just go to your main wallet screen, and tap the Buy/Sell icon. Converting from PHP to XRP would reflect the current buy rate, while converting XRP to PHP would reflect the current sell rate.
It's important to note that the XRP buy and sell rates fluctuate from time to time.
When converting funds from PHP to XRP, the buy rate will be applied.
Meanwhile, the sell rate would be applied when converting from XRP to PHP.