隐式类型转换 又称为“标准转换”，包括以下几种情况： 1) 算术转换(Arithmetic conversion) : 在混合类型的算术表达式中, 最宽的数据类型成为目标转换类型。
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usual arithmetic conversion 转换 ; 寻常算术转换
arithmetic base and scale conversion [计] 算术型基底和标度转换 ; 算术基底与标度转换
Arithmetic Type Conversion 算术类型转换
arithmetic gradient conversion factor 等差支付系列年值系数
arithmetic mode conversion 算术模转换
The usual arithmetic conversion rules state that first you perform the integer promotions on any integer operands.
常用算术转换规则规定在任意整数运算时首先执行整型提升。
As you probably suspect, the integer conversion rank is used to define the rules for expression evaluation. Those rules are named the integer promotions and the usual arithmetic conversions.
就如你可能猜想的那样，整数转换优先级用于定义表达式求值的规则。这些规则叫做整型提升和常用算术转换。
PHP also has automatic type conversion for arithmetic operations.
PHP还有用于算术运算的自动类型转换。
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