blocks|key|1040984|text|最简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1040985|$converted_res+=+$res+?+'true'+:+'false';|offset|length|style|CODE|1040986|entityMap^0|0|0|15|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Simplest solution:

<code>$converted_res = $res ? 'true' : 'false';</code>

blocks|key|1041157|text|函数var_export返回变量的字符串表示形式，因此您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1041158|var_export($res,+true);|code-block|syntax|javascript|1041159|第二个参数告诉函数返回字符串，而不是回显它。|1041160|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/var-export^0|2|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

The function <a href="http://php.net/var-export" rel="noreferrer">var_export</a> returns a string representation of a variable, so you could do this:

<pre><code>var_export($res, true);
</code></pre>

The second argument tells the function to return the string instead of echoing it.

blocks|key|1041191|text|另一种方法：json_encode(+booleanValue+)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1041192|echo+json_encode(true);++//+string+"true"

echo+json_encode(false);+//+string+"false"

//+null+!==+false
echo+json_encode(null);++//+string+"null"|code-block|syntax|javascript|1041193|entityMap^0|6|R|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|$]]

Another way to do : <code>json_encode( booleanValue )</code> 

<pre><code>echo json_encode(true); // string "true"

echo json_encode(false); // string "false"

// null !== false
echo json_encode(null); // string "null"
</code></pre>

blocks|key|1255997|text|请参阅var_export|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1255998|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.var-export.php^0|3|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

See <a href="http://php.net/manual/en/function.var-export.php" rel="noreferrer">var_export</a>

blocks|key|1041037|text|在PHP中，您可以使用strval()或(+string+)来转换为字符串。但是，这并不能将布尔值转换为"true“或"false”的实际拼写，因此您必须自己完成此操作。下面是一个示例函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1041038|function+strbool($value)
{
++++return+$value+?+'true'+:+'false';
}
echo+strbool(false);+//+"false"
echo+strbool(true);+//+"true"|code-block|syntax|javascript|1041039|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 use strval() or (string) to convert to string in PHP.
However, that does not convert boolean into the actual spelling of "true" or "false" so you must do that by yourself.
Here's an example function:

<pre><code>function strbool($value)
{
 return $value ? 'true' : 'false';
}
echo strbool(false); // "false"
echo strbool(true); // "true"
</code></pre>

blocks|key|1041246|text|这里的其他解决方案都有警告(尽管它们解决了手头的问题)。如果您(1)在混合类型上循环，或者(2)想要一个可以作为函数导出或包含在您的实用程序中的通用解决方案，那么这里的其他解决方案都不会起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1041247|最简单和最不言自明的解决方案是：|1041248|//+simplest,+most-readable
if+(is_bool($res)+{
++++$res+=+$res+?+'true'+:+'false';
}

//+same+as+above+but+written+more+tersely
$res+=+is_bool($res)+?+($res+?+'true'+:+'false')+:+$res;

//+Terser+still,+but+completely+unnecessary++function+call+and+must+be
//+commented+due+to+poor+readability.+What+is+var_export?+What+is+its
//+second+arg?+Why+are+we+exporting+stuff?
$res+=+is_bool($res)+?+var_export($res,+1)+:+$res;|code-block|syntax|javascript|1041249|但是，大多数阅读您的代码的开发人员都需要访问http://php.net/var_export才能理解var_export的作用以及第二个参数是什么。|offset|length|style|CODE|1041250|1.+var_export|1041251|适用于boolean输入，但也会将其他所有内容转换为string。|1041252|//+OK
var_export(false,+1);+//+'false'
//+OK
var_export(true,+1);++//+'true'
//+NOT+OK
var_export('',+1);++//+'\'\''
//+NOT+OK
var_export(1,+1);++//+'1'|1041253|2.+($res)+?+'true'+:+'false';|1041254|适用于布尔型输入，但将其他所有内容(整数、字符串)转换为true/false。|1041255|//+OK
true+?+'true'+:+'false'+//+'true'
//+OK
false+?+'true'+:+'false'+//+'false'
//+NOT+OK
''+?+'true'+:+'false'+//+'false'
//+NOT+OK
0+?+'true'+:+'false'+//+'false'|1041256|3.+json_encode()|1041257|与var_export相同的问题，甚至可能更糟，因为json_encode无法知道字符串true是字符串还是布尔值。|1041258|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/var_export^0|0|0|0|1F|A|M|P|0|0|3|A|0|3|7|Q|6|0|0|3|Q|0|0|0|3|D|0|1|A|Q|B|18|4|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1E|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1F|8|@$K|1G|L|1H|M|N]]|9|@$K|1I|L|1J|1|1K]]|A|$]]|$1|O|3|P|5|6|7|1L|8|@$K|1M|L|1N|M|N]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1O|8|@$K|1P|L|1Q|M|N]|$K|1R|L|1S|M|N]]|9|@]|A|$]]|$1|S|3|T|5|F|7|1T|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|1U|8|@$K|1V|L|1W|M|N]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1X|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|F|7|1Y|8|@]|9|@]|A|$G|H]]|$1|10|3|11|5|6|7|1Z|8|@$K|20|L|21|M|N]]|9|@]|A|$]]|$1|12|3|13|5|6|7|22|8|@$K|23|L|24|M|N]|$K|25|L|26|M|N]|$K|27|L|28|M|N]]|9|@]|A|$]]|$1|14|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]]]

The other solutions here all have caveats (though they address the question at hand). If you are (1) looping over mixed-types or (2) want a generic solution that you can export as a function or include in your utilities, none of the other solutions here will work.

The simplest and most self-explanatory solution is:

<pre><code>// simplest, most-readable
if (is_bool($res) {
 $res = $res ? 'true' : 'false';
}

// same as above but written more tersely
$res = is_bool($res) ? ($res ? 'true' : 'false') : $res;

// Terser still, but completely unnecessary function call and must be
// commented due to poor readability. What is var_export? What is its
// second arg? Why are we exporting stuff?
$res = is_bool($res) ? var_export($res, 1) : $res;
</code></pre>

But most developers reading your code will require a trip to <a href="http://php.net/var_export" rel="noreferrer">http://php.net/var_export</a> to understand what the <code>var_export</code> does and what the second param is.

<h1>1. <code>var_export</code></h1>

Works for <code>boolean</code> input but converts everything else to a <code>string</code> as well.

<pre><code>// OK
var_export(false, 1); // 'false'
// OK
var_export(true, 1); // 'true'
// NOT OK
var_export('', 1); // '\'\''
// NOT OK
var_export(1, 1); // '1'
</code></pre>

<h1>2. <code>($res) ? 'true' : 'false';</code></h1>

Works for boolean input but converts everything else (ints, strings) to true/false.

<pre><code>// OK
true ? 'true' : 'false' // 'true'
// OK
false ? 'true' : 'false' // 'false'
// NOT OK
'' ? 'true' : 'false' // 'false'
// NOT OK
0 ? 'true' : 'false' // 'false'
</code></pre>

<h1>3. <code>json_encode()</code></h1>

Same issues as <code>var_export</code> and probably worse since <code>json_encode</code> cannot know if the string <code>true</code> was intended a string or a boolean.

blocks|key|1256020|text|为什么不这样做呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1256021|if+($res)+{
++++$converted_res+=+"true";
}
else+{
++++$converted_res+=+"false";
}|code-block|syntax|javascript|1256022|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|$]]

Why just don't do like this?:

<pre><code>if ($res) {
 $converted_res = "true";
}
else {
 $converted_res = "false";
}
</code></pre>

blocks|key|1256470|text|对我来说，我想要一个字符串表示，除非它是null，在这种情况下，我希望它仍然是null。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1256471|var_export的问题是它将null转换为字符串"NULL"，还将空字符串转换为"''"，这是不可取的。我找不到简单的解决方案。|1256472|这是我最后使用的代码：|1256473|if+(is_bool($val))+$val+?+$val+=+"true"+:+$val+=+"false";
else+if+($val+!==+null)+$val+=+(string)$val;|code-block|syntax|javascript|1256474|如果你愿意，你也可以简单而简短地抛出一个函数。|1256475|entityMap^0|K|4|13|4|0|G|4|Q|6|16|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|R|$]]

For me, I wanted a string representation unless it was <code>null</code>, in which case I wanted it to remain <code>null</code>.

The problem with var_export is it converts <code>null</code> to a string <code>"NULL"</code> and it also converts an empty string to <code>"''"</code>, which is undesirable. There was no easy solution that I could find.

This was the code I finally used:

<pre><code>if (is_bool($val)) $val ? $val = "true" : $val = "false";
else if ($val !== null) $val = (string)$val;
</code></pre>

Short and simple and easy to throw in a function too if you prefer.

blocks|key|1256348|text|boolval()适用于声明变量、添加循环和过滤器不起作用的复杂表。示例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1256349|$result[$row['name']+.+"</td><td>"+.+(boolval($row['special_case'])+?+'True'+:+'False')+.+"</td><td>"+.+$row['more_fields']+=+$tmp|code-block|syntax|javascript|1256350|其中$tmp是用于转置其他数据的密钥。在这里，我想让表对1显示"Yes“，对0显示nothing，所以使用了(boolval($row['special_case'])+?+'Yes'+:+'')。|1256351|entityMap^0|0|9|0|0|2|4|1I|18|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

<code>boolval()</code> works for complicated tables where declaring variables and adding loops and filters do not work. Example:

<pre><code>$result[$row['name'] . "&lt;/td&gt;&lt;td&gt;" . (boolval($row['special_case']) ? 'True' : 'False') . "&lt;/td&gt;&lt;td&gt;" . $row['more_fields'] = $tmp
</code></pre>

where <code>$tmp</code> is a key used in order to transpose other data. Here, I wanted the table to display "Yes" for 1 and nothing for 0, so used <code>(boolval($row['special_case']) ? 'Yes' : '')</code>.

blocks|key|1256409|text|这也适用于任何类型的值：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1256410|$a+=+true;

echo+$a+++++++++++++++++++++//+outputs:+++1
echo+value_To_String(+$a+)++//+outputs:+++true|code-block|syntax|javascript|1256411|代码：|1256412|function+valueToString(+$value+){+
++++return+(+!is_bool(+$value+)+?++$value+:+($value+?+'true'+:+'false'+)++);+
}|1256413|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|$]]

This works also for any kind of value:

<pre><code>$a = true;

echo $a // outputs: 1
echo value_To_String( $a ) // outputs: true
</code></pre>

code:

<pre><code>function valueToString( $value ){ 
 return ( !is_bool( $value ) ? $value : ($value ? 'true' : 'false' ) ); 
}
</code></pre>

blocks|key|1041340|text|我不喜欢公认的答案，因为它会将任何计算结果为false的内容转换为"false"，不只是布尔值，反之亦然。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1041341|不管怎样，这是我的OT.T答案，它使用var_export函数。|1041342|var_export适用于除resource之外的所有变量类型，我已经创建了一个函数，它将根据提供的参数执行常规转换为字符串((string))、严格转换(var_export)和类型检查。|1041343|if(!function_exists('to_string')){

++++function+to_string($var,+$strict+=+false,+$expectedtype+=+null){

++++++++if(!func_num_args()){
++++++++++++return+trigger_error(__FUNCTION__+.+'()+expects+at+least+1+parameter,+0+given',+E_USER_WARNING);
++++++++}
++++++++if($expectedtype+!==+null++&&+gettype($var)+!==+$expectedtype){
++++++++++++return+trigger_error(__FUNCTION__+.+'()+expects+parameter+1+to+be+'+.+$expectedtype+.',+'+.+gettype($var)+.+'+given',+E_USER_WARNING);
++++++++}
++++++++if(is_string($var)){
++++++++++++return+$var;
++++++++}
++++++++if($strict+&&+!is_resource($var)){
++++++++++++return+var_export($var,+true);
++++++++}
++++++++return+(string)+$var;
++++}
}

if(!function_exists('bool_to_string')){

++++function+bool_to_string($var){
++++++++return+func_num_args()+?+to_string($var,+true,+'boolean')+:+to_string();++++++++
++++}
}

if(!function_exists('object_to_string')){

++++function+object_to_string($var){
++++++++return+func_num_args()+?+to_string($var,+true,+'object')+:+to_string();++++++++
++++}
}

if(!function_exists('array_to_string')){

++++function+array_to_string($var){
++++++++return+func_num_args()+?+to_string($var,+true,+'array')+:+to_string();++++++++
++++}
}|code-block|syntax|javascript|1041344|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.var-export.php^0|X|7|0|J|A|J|A|0|0|0|A|E|8|1R|8|26|A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]|$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1E|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

I'm not a fan of the accepted answer as it converts anything which evaluates to false to <code>"false"</code> no just boolean and vis-versa. 

Anyway here's my O.T.T answer, it uses the <a href="http://php.net/manual/en/function.var-export.php" rel="nofollow"><code>var_export</code></a> function.

<code>var_export</code> works with all variable types except <code>resource</code>, I have created a function which will perform a regular cast to string (<code>(string)</code>), a strict cast (<code>var_export</code>) and a type check, depending on the arguments provided.. 

<pre><code>if(!function_exists('to_string')){

 function to_string($var, $strict = false, $expectedtype = null){

 if(!func_num_args()){
 return trigger_error(__FUNCTION__ . '() expects at least 1 parameter, 0 given', E_USER_WARNING);
 }
 if($expectedtype !== null &amp;&amp; gettype($var) !== $expectedtype){
 return trigger_error(__FUNCTION__ . '() expects parameter 1 to be ' . $expectedtype .', ' . gettype($var) . ' given', E_USER_WARNING);
 }
 if(is_string($var)){
 return $var;
 }
 if($strict &amp;&amp; !is_resource($var)){
 return var_export($var, true);
 }
 return (string) $var;
 }
}

if(!function_exists('bool_to_string')){

 function bool_to_string($var){
 return func_num_args() ? to_string($var, true, 'boolean') : to_string(); 
 }
}

if(!function_exists('object_to_string')){

 function object_to_string($var){
 return func_num_args() ? to_string($var, true, 'object') : to_string(); 
 }
}

if(!function_exists('array_to_string')){

 function array_to_string($var){
 return func_num_args() ? to_string($var, true, 'array') : to_string(); 
 }
}
</code></pre>

blocks|key|1256281|text|$converted_res+=+isset+(+$res+)+?+(+$res+?+'true'+:+'false'+)+:+'false';|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1256282|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$converted_res = isset ( $res ) ? ( $res ? 'true' : 'false' ) : 'false';
</code></pre>

blocks|key|1041424|text|function+ToStr($Val=null,$T=0){

++++return+is_string($Val)?"$Val"
++++:
++++(
++++++++is_numeric($Val)?($T?"$Val":$Val)
++++++++:
++++++++(
++++++++++++is_null($Val)?"NULL"
++++++++++++:
++++++++++++(
++++++++++++++++is_bool($Val)?($Val?"TRUE":"FALSE")
++++++++++++++++:
++++++++++++++++(
++++++++++++++++++++is_array($Val)?@StrArr($Val,$T)
++++++++++++++++++++:
++++++++++++++++++++false
++++++++++++++++)
++++++++++++)
++++++++)
++++);

}
function+StrArr($Arr,$T=0)
{
++++$Str="";
++++$i=-1;
++++if(is_array($Arr))
++++foreach($Arr+AS+$K+=>+$V)
++++$Str.=((%2B%2B$i)?",+":null).(is_string($K)?"\"$K\"":$K)."+=>+".(is_string($V)?"\"$V\"":@ToStr($V,$T%2B1));
++++return+"array(+".($i?@ToStr($Arr):$Str)."+)".($T?null:";");
}

$A+=+array(1,2,array('a'=>'b'),array('a','b','c'),true,false,ToStr(100));
echo+StrArr($A);+//+OR+ToStr($A)+//+OR+ToStr(true)+//+OR+StrArr(true)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1041425|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function ToStr($Val=null,$T=0){

 return is_string($Val)?"$Val"
 :
 (
 is_numeric($Val)?($T?"$Val":$Val)
 :
 (
 is_null($Val)?"NULL"
 :
 (
 is_bool($Val)?($Val?"TRUE":"FALSE")
 :
 (
 is_array($Val)?@StrArr($Val,$T)
 :
 false
 )
 )
 )
 );

}
function StrArr($Arr,$T=0)
{
 $Str="";
 $i=-1;
 if(is_array($Arr))
 foreach($Arr AS $K =&gt; $V)
 $Str.=((++$i)?", ":null).(is_string($K)?"\"$K\"":$K)." =&gt; ".(is_string($V)?"\"$V\"":@ToStr($V,$T+1));
 return "array( ".($i?@ToStr($Arr):$Str)." )".($T?null:";");
}

$A = array(1,2,array('a'=&gt;'b'),array('a','b','c'),true,false,ToStr(100));
echo StrArr($A); // OR ToStr($A) // OR ToStr(true) // OR StrArr(true)
</code></pre>

blocks|key|1256547|text|如果先转换成整数，然后再转换成字符串呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1256548|$+php+-a
Interactive+mode+enabled

php+>+$a+=+true;
php+>+$b+=+false;
php+>+$c+=+(string)(int)$a;
php+>+$d+=+(string)(int)$b;
php+>+var_dump($c);
string(1)+"1"
php+>+var_dump($d);
string(1)+"0"
php+>|code-block|syntax|javascript|1256549|如果将布尔值直接转换为字符串，会发生什么？|1256550|$+php+-a
Interactive+mode+enabled

php+>+$a+=+true;
php+>+$b+=+false;
php+>+$c+=+(string)$a;
php+>+$d+=+(string)$b;
php+>+var_dump($c);
string(1)+"1"
php+>+var_dump($d);
string(0)+""
php+>|1256551|将false转换为string将生成空字符串""。|offset|length|style|CODE|1256552|entityMap^0|0|0|0|0|1|5|M|2|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]|$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

How about converting to integer, then to string?
<pre><code>$ php -a
Interactive mode enabled

php &gt; $a = true;
php &gt; $b = false;
php &gt; $c = (string)(int)$a;
php &gt; $d = (string)(int)$b;
php &gt; var_dump($c);
string(1) &quot;1&quot;
php &gt; var_dump($d);
string(1) &quot;0&quot;
php &gt;
</code></pre>
What happens if you convert a boolean directly to string?
<pre><code>$ php -a
Interactive mode enabled

php &gt; $a = true;
php &gt; $b = false;
php &gt; $c = (string)$a;
php &gt; $d = (string)$b;
php &gt; var_dump($c);
string(1) &quot;1&quot;
php &gt; var_dump($d);
string(0) &quot;&quot;
php &gt;
</code></pre>
Converting a <code>false</code> to string will produce an empty string <code>&quot;&quot;</code>.

I have a Boolean variable which I want to convert to a string:

<pre><code>$res = true;
</code></pre>

I need the converted value to be of the format: <code>"true" "false"</code>, not <code>"0" "1"</code>

<pre><code>$converted_res = "true";
$converted_res = "false";
</code></pre>

I've tried:

<pre><code>$converted_res = string($res);
$converted_res = String($res);
</code></pre>

But it tells me that <code>string</code> and <code>String</code> are not recognized functions. 
How do I convert this Boolean to a string in the format of <code>"true"</code> or <code>"false"</code> in PHP?

How to Convert Boolean to String

我有一个布尔变量，我想将其转换为字符串：$res = true;我需要转换后的值的格式为："true" "false"，而不是"0" "1"$converted_res = "true";$converted_res = "false";我试过了：$converted_res = string($res);$converted_res = String($res);但它告诉我，string和Str

问如何将布尔值转换为字符串
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