PHP - 获取 bool 以在 false 时回显 false
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PHP - Get bool to echo false when false
提问by Anonymous1
The following code doesn't print out anything:
以下代码不打印任何内容：
$bool_val = (bool)false;
echo $bool_val;
But the following code prints 1:
但是下面的代码打印1：
$bool_val = (bool)true;
echo $bool_val;
Is there a better way to print 0or falsewhen $bool_valis falsethan adding an ifstatement?
有没有更好的方式来打印0或false时$bool_val是false不是增加一个if声明？
回答by Dan Grossman
echo $bool_val ? 'true' : 'false';
Or if you only want output when it's false:
或者，如果您只想在它为 false 时输出：
echo !$bool_val ? 'false' : '';
回答by Saad
This is the easiest way to do this:
这是最简单的方法：
$text = var_export($bool_value,true);
echo $text;
or
或者
var_export($bool_value)
If the second argument is not true, it will output the result directly.
如果第二个参数不为真，则直接输出结果。
回答by Ignacio Vazquez-Abrams
No, since the other option is modifying the Zend engine, and one would be hard-pressed to call that a "better way".
不，因为另一种选择是修改 Zend 引擎，很难称其为“更好的方法”。
Edit:
编辑：
If you really wanted to, you could use an array:
如果你真的想，你可以使用一个数组：
$boolarray = Array(false => 'false', true => 'true');
echo $boolarray[false];
回答by serdar.sanri
This will print out boolean value as it is, instead of 1/0.
这将按原样打印出布尔值，而不是 1/0。
$bool = false;
echo json_encode($bool); //false
回答by Yanick Rochon
Try converting your boolean to an integer?
尝试将您的布尔值转换为整数？
echo (int)$bool_val;
回答by akond
I like this one to print that out
我喜欢这个打印出来
var_dump ($var);
回答by Jon Surrell
var_exportprovides the desired functionality.
var_export提供所需的功能。
This will alwaysprint a value rather than printing nothing for nullor false. var_exportprints a PHP representation of the argument it's passed, the output could be copy/pasted back into PHP.
这将始终打印一个值，而不是为nullor打印任何内容false。var_export打印它传递的参数的 PHP 表示，输出可以复制/粘贴回 PHP。
var_export(true); // true
var_export(false); // false
var_export(1); // 1
var_export(0); // 0
var_export(null); // NULL
var_export('true'); // 'true' <-- note the quotes
var_export('false'); // 'false'
If you want to print strings "true"or "false", you can cast to a boolean as below, but beware of the peculiarities:
如果要打印字符串"true"or "false"，可以按如下方式转换为布尔值，但要注意其特殊性：
var_export((bool) true); // true
var_export((bool) false); // false
var_export((bool) 1); // true
var_export((bool) 0); // false
var_export((bool) ''); // false
var_export((bool) 'true'); // true
var_export((bool) null); // false
// !! CAREFUL WITH CASTING !!
var_export((bool) 'false'); // true
var_export((bool) '0'); // false
回答by David Oliver
回答by mohamedeimo
echo(var_export($var));
When $varis boolean variable, trueor falsewill be printed out.
when$var是布尔变量，trueorfalse会被打印出来。
回答by nuala
The %boption of sprintf()will convert a boolean to an integer:
该%b的选项的sprintf（）将一个布尔值转换为整数：
echo sprintf("False will print as %b", false); //False will print as 0
echo sprintf("True will print as %b", true); //True will print as 1
If you're not familiar with it: You can give this function an arbitrary amount of parameters while the first one should be your ouput string spiced with replacement strings like %bor %sfor general string replacement.
如果你不熟悉的话：你可以给这个函数的参数的任意量，同时第一个应该是您与替换字符串像五香输出中的字符串%b或%s通用字符串替换。
Each pattern will be replaced by the argument in order:
每个模式将按顺序替换为参数：
echo sprintf("<h1>%s</h1><p>%s<br/>%s</p>", "Neat Headline", "First Line in the paragraph", "My last words before this demo is over");
