i need help with making simple php code

i need help with making simple php code

i need little help with make the " token" line only

First, values should be converted to lower case:
Parameter: merchant_id value: test
Parameter: amount value: 15.25
Parameter: currency value: aed
Then their values are contacted:
test:15.25:aed
The Encryption Key is appended to the end of the
string:
test:15.25:aed:Hello World
The MD5 function is called on the resulting string:
MD5(“test:15.25:aed:Hello World”)

my problem is the price is changing from gig to other gig and when i make token line i don't have one number for amount value and i tried to put instade of the number "{$p.totalprice|stripslashes}" but that didn't work

if you are a php programming i can give you all the code for help me to make the token value

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Requirements

php
programming
html

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Skills Required

php