PHP coding standards (23)_PHP tutorial

9.1 Constants

Numeric constants located in for loops as counter values, except -1, 0 and 1, should not be written directly into the code.

9.2 Variable assignment

Avoid assigning the same value to multiple variables in one statement. It's hard to read. For example:
$fooBar.fChar = $barFoo.lchar = c; // Error

Do not use the assignment operator in a place where it is easily confused with the equality operator. For example:
if ($c++ = $d++) { // Error
...
}

should be written as
if (($c++ = $d++) != 0 ) {
　...
}

Do not use embedded assignment operators to try to improve runtime efficiency. This is the job of the compiler. For example:
$d = ($a = $b + $c) + $r; // The error

should be written as
$a = $b + $c;
$d = $a + $r;

http://www.bkjia.com/PHPjc/532581.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/532581.htmlTechArticle9.1 The constant is located in the for loop as a numeric constant of the counter value. Except for -1, 0 and 1, there is no should be written directly into code. 9.2 Variable assignment Avoid assigning the same value to multiple variables in one statement...