blocks|key|793290|text|echo+$bool_val+?+'true'+:+'false';|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|793291|或者，如果您只想要输出为false的输出：|unstyled|793292|echo+!$bool_val+?+'false'+:+'';|793293|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>echo $bool_val ? 'true' : 'false';
</code></pre>

Or if you only want output when it's false:

<pre><code>echo !$bool_val ? 'false' : '';
</code></pre>

blocks|key|1007611|text|这是完成此操作的最简单方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1007612|$text+=+var_export($bool_value,true);
echo+$text;|code-block|syntax|javascript|1007613|或|1007614|var_export($bool_value)|1007615|如果第二个参数不是true，它将直接输出结果。|1007616|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This is the easiest way to do this:

<pre><code>$text = var_export($bool_value,true);
echo $text;
</code></pre>

or

<pre><code>var_export($bool_value)
</code></pre>

If the second argument is not true, it will output the result directly.

blocks|key|793756|text|这将按原样打印布尔值，而不是1/0。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|793757|++++$bool+=+false;

++++echo+json_encode($bool);+++//false|code-block|syntax|javascript|793758|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This will print out boolean value as it is, instead of 1/0. 

<pre><code> $bool = false;

 echo json_encode($bool); //false
</code></pre>

blocks|key|1007201|text|尝试将布尔值转换为整数？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1007202|+echo+(int)$bool_val;|code-block|syntax|javascript|1007203|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try converting your boolean to an integer?

<pre><code> echo (int)$bool_val;
</code></pre>

blocks|key|793367|text|我喜欢这个把它打印出来|type|unstyled|depth|inlineStyleRanges|entityRanges|data|793368|var_dump+($var);|code-block|syntax|javascript|793369|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I like this one to print that out

<pre><code>var_dump ($var);
</code></pre>

blocks|key|1007776|text|echo(var_export($var));+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1007777|当$var为布尔变量时，将输出true或false。|unstyled|offset|length|style|CODE|1007778|entityMap^0|0|1|4|F|4|K|5|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]|$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>echo(var_export($var)); 
</code></pre>

When <code>$var</code> is boolean variable, <code>true</code> or <code>false</code> will be printed out.

blocks|key|1007823|text|这将提供0或1|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1007824|intval($bool_val);|code-block|syntax|javascript|1007825|PHP+Manual:+intval+function|1007826|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/intval^0|4|1|6|1|0|0|0|R|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

This gives <code>0</code> or <code>1</code>:

<pre class="lang-php prettyprint-override"><code>intval($bool_val);
</code></pre>

<a href="http://php.net/intval" rel="noreferrer">PHP Manual: intval function</a>

blocks|key|1007700|text|sprintf()的%25b选项会将布尔值转换为整数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1007701|echo+sprintf("False+will+print+as+%25b",+false);+//False+will+print+as+0
echo+sprintf("True+will+print+as+%25b",+true);+//True+will+print+as+1|code-block|syntax|javascript|1007702|如果您不熟悉它:您可以为该函数提供任意数量的参数，而第一个参数应该是带有替换字符串的输出字符串，比如用于常规字符串替换的%25b或%25s。|1007703|每种模式都将按如下顺序替换为参数：|1007704|echo+sprintf("<h1>%25s</h1>%25s %25s",+"Neat+Headline",+"First+Line+in+the+paragraph",+"My+last+words+before+this+demo+is+over");|1007705|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.sprintf.php^0|A|2|0|9|0|0|0|1O|2|1R|2|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1A|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|Q|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

The <code>%b</code> option of <a href="http://php.net/manual/en/function.sprintf.php" rel="noreferrer">sprintf()</a> will convert a boolean to an integer:

<pre><code>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
</code></pre>

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 <code>%b</code> or <code>%s</code> for general string replacement.

Each pattern will be replaced by the argument in order:

<pre><code>echo sprintf("&lt;h1&gt;%s&lt;/h1&gt;&lt;p&gt;%s&lt;br/&gt;%s&lt;/p&gt;", "Neat Headline", "First Line in the paragraph", "My last words before this demo is over");
</code></pre>

blocks|key|1007316|text|您可以使用三元运算符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1007317|echo+false+?+'true'+:+'false';|code-block|syntax|javascript|1007318|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use a ternary operator

<pre><code>echo false ? 'true' : 'false';
</code></pre>

blocks|key|793722|text|json_encode将开箱即用，但它并不美观(缩进等)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|793723|echo+json_encode(array('whatever'+=>+TRUE,+'somethingelse'+=>+FALSE));|code-block|syntax|javascript|793724|...gives...|793725|{"whatever":true,"somethingelse":false}|793726|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

json_encode will do it out-of-the-box, but it's not pretty (indented, etc):

<pre><code>echo json_encode(array('whatever' =&gt; TRUE, 'somethingelse' =&gt; FALSE));
</code></pre>

...gives...

<pre><code>{"whatever":true,"somethingelse":false}
</code></pre>

blocks|key|1008107|text|您正在将布尔值转换为布尔值，并期望显示一个整数。它适用于true，但不适用于false。由于您期望的是一个整数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1008108|echo+(int)$bool_val;|code-block|syntax|javascript|1008109|entityMap^0|S|4|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Your'e casting a boolean to boolean and expecting an integer to be displayed. It works for <code>true</code> but not false. Since you expect an integer:

<pre><code>echo (int)$bool_val;
</code></pre>

The following code doesn't print out anything:

<pre><code>$bool_val = (bool)false;
echo $bool_val;
</code></pre>

But the following code prints <code>1</code>:

<pre><code>$bool_val = (bool)true;
echo $bool_val;
</code></pre>

Is there a better way to print <code>0</code> or <code>false</code> when <code>$bool_val</code> is <code>false</code> than adding an <code>if</code> statement?

PHP - Get bool to echo false when false

下面的代码不会输出任何内容：$bool_val = (bool)false;echo $bool_val;但是下面的代码打印1$bool_val = (bool)true;echo $bool_val;当$bool_val为false时，有比添加if语句更好的打印$bool_val或if的方法吗？

问PHP -当为false时，让bool回显false
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回答 11

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问PHP -当为false时，让bool回显falseEN

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问PHP -当为false时，让bool回显false
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