PHP Coding Specification (_php) tutorial

9.3.1 parentheses

In general, it is a good practice to use parentheses in expressions that contain multiple operators to avoid operator precedence. Even though the precedence of an operator might be clear to you, it may not be the case for others. You can't assume that other programmers are as aware of the precedence of operators as you do.
if ($a = = $b && $c = = $d)//Error
if ($a = = $b) && ($c = = $d))//correct

http://www.bkjia.com/PHPjc/532580.html www.bkjia.com true http://www.bkjia.com/PHPjc/532580.html techarticle 9.3.1 Parentheses in general, it is a good practice to use parentheses in expressions that contain multiple operators to avoid operator precedence. Even if the operator's priority is possible for you ...

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