books explanation of 20 functions in php
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# Function verses
# The function of the Qur'an
# The function of the people of Islam
# continuous function
# linear function
# probability density function
# periodic function
# wave function
# case function
# divergent function
# quadratic function
# universal function
# Prepared function for prime numbers
# rational function
# open function to open files
# denominator function
# cubic function
# function root
# analytic function
# inverse function
