Web Reference: PHP has several built-in functions that help you perform anything from simple additions or subtraction to advanced calculations. You've already seen how to perform basic mathematical operations in PHP operators chapter. Let's check out one more example: For a complete reference of all math functions, go to our complete PHP Math Reference. The PHP math reference contains description and example of use, for each function. 2x+3x^2 witch is the differantial of the previous equation. In the code there is one thing missing: the $string{$i} is often going outOfBound (Uninitialized string offset: 6 in...) if your error setting is set a little too high... I just dont know how to fix this.
YouTube Excerpt: PHP tutorial Maths addition example
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