Understanding the precedence and binding of operators in PHP

Generally, operators have a set of precedence, that is, the order in which they are executed. Operators also have associativity, which is the order in which operators of the same precedence are executed. This order is usually left-to-right (left), right-to-left (short-right), or irrelevant. The following table shows the operators and correlation tables in PHP, and the rule that they appear is that the top operators have the lowest precedence, and the precedence is incremented by the top-down order of the table. Associative operators Left Left or Left XOR Left and Right print left = + = = *=/=. =%= &= |= ^= ~= <<= >>= Left?: Left | | Left && Left | Left ^ Left & left = = = = = = =!== Left < <= > >= Left << >> Left +-. Left */% Right! -+ = = (int) (double) (string) (array) (object) @ Right [] Not relevant new Not relevant () The highest-priority operator is the normal parenthesis, because it avoids the precedence rule of the operator.

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