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Use of & & operators

2022-07-20 15:01:00 【Full stack programmer webmaster】

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$a = 0;
$b = 2;
!empty($a) && $c = is_numeric($b);
echo 'a=' . $a, ', c=' . $c;

// Investigate ： Operator priority   and  &&  Use ;
//&&  When true on the left , Start executing the code on the right  ; False on the left , The right side is no longer executed , Directly execute the following code 
// $a=0;
//  a=0
//Notice: Undefined variable: c in D:\wwwroot\test.php on line 7
//, c=

// $a=1;
//   result ：a=1, c=1

!empty($_SERVER[$mkey]) && $otherServers = explode(' ',$_SERVER[$mkey]);
// Equate to 
if (!empty($_SERVER[$mkey])){
    $otherServers = explode(' ',$_SERVER[$mkey]);
}

Publisher ： Full stack programmer stack length , Reprint please indicate the source ：https://javaforall.cn/111485.html Link to the original text ：https://javaforall.cn

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Use of & & operators

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