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                ## 運算符 運算符是可以通過給出的一或多個值(用編程行話來說,表達式)來產生另一個值(因而整個結構成為一個表達式)的東西。 運算符可按照其能接受幾個值來分組。一元運算符只能接受一個值,例如!(邏輯取反運算符)或++(遞增運算符)。二元運算符可接受兩個值,例如熟悉的算數運算符+(加)和-(減),大多數PHP運算符都是這種。最后是唯一的三元運算符?:,可接受三個值;通常就簡單稱之為“三元運算符”(盡管稱之為條件運算符可能更合適)。
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