[PHP] pow exponential operation function and binary conversion

1.a’s -2 power = (a/a) to the 2nd power
2.-a’s 2nd power and 3rd power According to this rule, negative and negative are positive, and negative and positive are negative, Positive is positive, if the exponent is an even number, the final result is positive, if it is an odd number, it is negative
3. Convert binary to decimal, starting with 0b is binary

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