PHP还有用于算术运算的自动类型转换。
PHP also has automatic type conversion for arithmetic operations.
当算术运算的结果在它的支援范围的外面时候，这一个错误被报告。
This error is reported when the result of an arithmetic operation is outside of its supported range.
ECC算法中基域的选择、坐标系的选择、标量乘法和域算术运算的实现。
The process of ECC includes the selection of base field and coordinates, scalar multiplication and field operation.
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