Original repo https://github.com/pear/Math_Finance

• PEAR requirement is removed, all PEAR::raiseError is replaced with throwing php Exception
• static keyword is added for all static methods
• method visibility keywords are added
• all classes are called from global namespace
• Other small improvements

You should use composer to install it

composer require hashmode/math_finance

After installation add the below code into your composer.json and run composer dump-autoload

"classmap": [
    "your-vendor-folder/hashmode/math_finance/Math",
    "your-vendor-folder/hashmode/math_numerical_rootfinding/Math/Numerical"
]        

This package is dependent on Math_Numerical_RootFinding (requirement is added into composer) https://github.com/hashmode/Math_Numerical_RootFinding