php 布尔值切换/反转
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Boolean value switch/invert
提问by jolt
Is there a function for switching/inverting booleanvalue in PHP?
booleanPHP中是否有切换/反转值的功能？
Like... a shortcut for:
就像...的快捷方式：
if($boolean === true){
$boolean = false;
}else{
$boolean = true;
}
回答by Pekka
Yes:
是的：
$boolean = !$boolean;
if it's not a boolean value, you can use the ternary construction:
如果它不是布尔值，则可以使用三元结构：
$int = ($some_condition ? 1 : 2); // if $some_condition is true, set 1
// otherwise set 2
回答by Wagner Lipnharski
What about using the Absolute Value function abs(), $val can be "1" or "0" and you want to invert it:
使用绝对值函数怎么样abs()， $val 可以是“1”或“0”，你想反转它：
$val = abs($val-=1);
The logic:
逻辑：
Always subtracting "1" from the number and eliminating the "sign".
总是从数字中减去“1”并消除“符号”。
1 - 1 = 0
abs(0) = 0
0 - 1 = -1
abs(-1) = 1
回答by Gannet
If you want the shortest possible code, XOR the boolean with 1:
如果您想要尽可能短的代码，请将布尔值与 1 异或：
$boolean ^= 1;
Strictly this returns an int not a boolean. It doesn't work the same way as $boolean = !$boolean(and is slightly less efficient) but for most purposes it should do the job.
严格来说，这将返回一个 int 而不是一个布尔值。它的工作方式与$boolean = !$boolean（并且效率略低）不同，但对于大多数目的，它应该可以完成这项工作。
回答by Abhinav bhardwaj
Just use !to invert the result so it can be like:
$boolean = !(bool)$result;
只是!用来反转结果，所以它可以是这样的： $boolean = !(bool)$result;
回答by A.N
you can do it in one line :
你可以在一行中完成：
<?php
$val = 0
$val = $val ==1?0:1;
?>
回答by lazycommit
One touch pick of boolean:
一键选择布尔值：
$detector = !$picker = $detector;
$detector = !$picker = $detector;
回答by user563836
bool can be either TRUE or FALSE.
bool 可以是 TRUE 或 FALSE。
usage : (boolean)$red = varbool(false);
echo $red;
用法 : (boolean)$red = varbool(false);
回声 $red;
for true it will return zero and one for false
如果为真，它将返回零，为假返回一
function varbool($val){
$val +=(-1);
$val *= (-1);
return $val;
}
