PHP coding standards (24)_PHP tutorial

9.3.1 Parentheses

In general, it is a good idea to use parentheses in expressions that contain multiple operators to avoid operator precedence issues. Even though operator precedence may be clear to you, it may not be so to others. You cannot assume that other programmers know operator precedence as well as you do.
if ($a == $b && $c == $d) // Wrong
if (($a == $b) && ($c == $d)) // Correct

http://www.bkjia.com/PHPjc/532580.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/532580.htmlTechArticle9.3.1 Parentheses Generally speaking, use parentheses in expressions containing multiple operators to avoid Operator precedence issue is a good approach. Even though the operator precedence may be different for you...