PHP 布尔值 TRUE/FALSE？
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PHP boolean TRUE / FALSE?
提问by never_had_a_name
I can't figure this out.
我想不通。
If I type:
如果我输入：
function myfunction(){
......
if ...
return TRUE;
if ...
return FALSE;
}
Why can't I use it like this:
为什么我不能像这样使用它：
$result = myfunction();
if ($result == TRUE)
...
if ($result == FALSE)
...
Or do I have to use:
或者我必须使用：
$result = myfunction();
if ($result == 1)
...
if ($result == 0)
...
Or this:
或这个：
$result = myfunction();
if ($result)
...
if (!$result)
...
回答by Tordek
I don't fully understand your question, but you canuse any of the examples you provided, with the following caveats:
我不完全理解您的问题，但您可以使用您提供的任何示例，但有以下注意事项：
If you say if (a == TRUE)(or, since the comparison to trueis redundant, simply if (a)), you must understand that PHP will evaluate several things as true: 1, 2, 987, "hello", etc.; They are all "truey" values. This is rarely an issue, but you should understand it.
如果您说if (a == TRUE)（或者，因为与 to 的比较true是多余的，只是简单地if (a)），您必须明白 PHP 会将几项评估为真：1、2、987、“你好”等；它们都是“truey”值。这很少是一个问题，但你应该理解它。
However, if the function can return more than trueor false, you may be interested in using ===. ===does compare the type of the variables: "a" == trueis true, but "a" === trueis false.
但是，如果该函数可以返回多个true或false，您可能对使用===. ===确实比较变量的类型： "a" == trueis true，但"a" === true为 false。
回答by Aranxo
If you dont need to use the result variable $result furthermore, I would do the following shortest version:
如果您不需要进一步使用结果变量 $result ，我将执行以下最短版本：
if (myfunction()) {
// something when true
} else {
// something else when false
}
回答by YOU
You could do like this
你可以这样做
$result = myfunction();
if ($result === TRUE)
...
if ($result === FALSE)
...
回答by Amarghosh
You can use if($result == TRUE)but that's an overkill as if($result)is enough.
你可以使用，if($result == TRUE)但这if($result)已经足够了。
回答by pcp
if($variable)
//something when truw
else
//something else when false
Remember that the value -1 is considered TRUE, like any other non-zero (whether negative or positive) number. FALSE would be 0 obv...
请记住，值 -1 被认为是 TRUE，就像任何其他非零（无论是负数还是正数）数一样。FALSE 将是 0 obv ...
