blocks|key|1439143|text|您可以像这样访问它们：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1439144|print+$$string;|code-block|syntax|javascript|1439145|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 would access them like:

<pre><code>print $$string;
</code></pre>

blocks|key|1653870|text|快速和肮脏：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1653871|echo+eval('return+$'.+$string+.+';');|code-block|syntax|javascript|1653872|当然，首先需要对输入字符串进行杀毒。|1653873|如果你不喜欢又快又脏...然后这也会起作用，而且它不需要eval，这甚至会让我感到害怕。|1653874|但是，它确实对字符串格式进行了假设：|1653875|<?php
$data['response']+=+array(
++++'url'+=>+'http://www.testing.com'
);

function+extract_data($string)+{
++++global+$data;

++++$found_matches+=+preg_match_all('/\[\"([a-z]%2B)\"\]/',+$string,+$matches);
++++if+(!$found_matches)+{
++++++++++++return+null;
++++}

++++$current_data+=+$data;
++++foreach+($matches[1]+as+$name)+{
++++++++++++if+(key_exists($name,+$current_data))+{
++++++++++++++++++++$current_data+=+$current_data[$name];
++++++++++++}+else+{
++++++++++++++++++++return+null;
++++++++++++}
++++}

++++return+$current_data;
}+

echo+extract_data('data["response"]["url"]');
?>|1653876|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Quick and dirty: 

<pre><code>echo eval('return $'. $string . ';');
</code></pre>

Of course the input string would need to be be sanitized first.

If you don't like quick and dirty... then this will work too and it doesn't require eval which makes even me cringe.

It does, however, make assumptions about the string format:

<pre><code>&lt;?php
$data['response'] = array(
 'url' =&gt; 'http://www.testing.com'
);

function extract_data($string) {
 global $data;

 $found_matches = preg_match_all('/\[\"([a-z]+)\"\]/', $string, $matches);
 if (!$found_matches) {
 return null;
 }

 $current_data = $data;
 foreach ($matches[1] as $name) {
 if (key_exists($name, $current_data)) {
 $current_data = $current_data[$name];
 } else {
 return null;
 }
 }

 return $current_data;
} 

echo extract_data('data["response"]["url"]');
?&gt;
</code></pre>

blocks|key|1439228|text|PHP的variable+variables会帮你解决这个问题。您可以通过在变量前加上另一个美元符号来使用它们：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1439229|$foo+=+"Hello,+world!";
$bar+=+"foo";
echo+$$bar;+//+outputs+"Hello,+world!"|code-block|syntax|javascript|1439230|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/language.variables.variable^0|4|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

PHP's <a href="http://us2.php.net/language.variables.variable" rel="noreferrer">variable variables</a> will help you out here. You can use them by prefixing the variable with another dollar sign:

<pre><code>$foo = "Hello, world!";
$bar = "foo";
echo $$bar; // outputs "Hello, world!"
</code></pre>

blocks|key|1653923|text|在Variable+variables页面上找到了以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1653924|function+VariableArray($data,+$string)+{+
++++preg_match_all('/\[([%5E\]]*)\]/',+$string,+$arr_matches,+PREG_PATTERN_ORDER);+

++++$return+=+$arr;+
++++foreach($arr_matches[1]+as+$dimension)+{+$return+=+$return[$dimension];+}

++++return+$return;+
}+|code-block|syntax|javascript|1653925|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/language.variables.variable^0|1|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Found this on the <a href="http://us2.php.net/language.variables.variable" rel="nofollow noreferrer">Variable variables</a> page:

<pre><code>function VariableArray($data, $string) { 
 preg_match_all('/\[([^\]]*)\]/', $string, $arr_matches, PREG_PATTERN_ORDER); 

 $return = $arr; 
 foreach($arr_matches[1] as $dimension) { $return = $return[$dimension]; }

 return $return; 
} 
</code></pre>

blocks|key|1653976|text|我也在为此而苦苦挣扎，我有这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1653977|$user++=++array('a'=>'alber',+'b'=>'brad'...);

$array_name+=+'user';|code-block|syntax|javascript|1653978|我想知道怎么才能进入艾伯特。|1653979|一开始我试着|1653980|$value_for_a+=+$$array_name['a'];+//+this+dosen't+work+|1653981|然后|1653982|eval('return+$'.$array_name['a'].';');+//+this+dosen't+work,+maybe+the+hoster+block+eval+which+is+very+common|1653983|最后，我尝试了这个愚蠢的方法：|1653984|$array_temp=$$array_name;
$value_for_a+=+$array_temp['a'];|1653985|这真是太完美了！智慧，做简单的事，做愚蠢的事。|1653986|我希望这能回答你的问题。|1653987|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

I was struggling with that as well, 
I had this : 

<pre><code>$user = array('a'=&gt;'alber', 'b'=&gt;'brad'...);

$array_name = 'user';
</code></pre>

and I was wondering how to get into albert. 

at first I tried 

<pre><code>$value_for_a = $$array_name['a']; // this dosen't work 
</code></pre>

then 

<pre><code>eval('return $'.$array_name['a'].';'); // this dosen't work, maybe the hoster block eval which is very common
</code></pre>

then finally I tried the stupid thing: 

<pre><code>$array_temp=$$array_name;
$value_for_a = $array_temp['a'];
</code></pre>

and this just worked Perfect! 
wisdom, do it simple do it stupid. 

I hope this answers your question

blocks|key|1654035|text|这可以用一种简单得多的方法来完成。你所要做的就是想一想PHP提供了什么函数来创建变量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1654036|$string+=+'myvariable';
extract(array($string+=>+$string));
echo+$myvariable;|code-block|syntax|javascript|1654037|完成了！|1654038|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This can be done in a much simpler way. All you have to do is think about what function PHP provides that creates variables. 

<pre><code>$string = 'myvariable';
extract(array($string =&gt; $string));
echo $myvariable;
</code></pre>

done!

blocks|key|1654072|text|您可以通过引用运算符&进行传递。因此，在您的示例中，您将看到如下内容|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1654073|$string+=+&$data["status"];
$string+=+&$data["response"]["url"];
$string+=+&$data["entry"]["0"]["text"];|code-block|syntax|javascript|1654074|否则，您需要这样做：|1654075|$titular+=+array();
for+($r+=+1;+$r+<+$rooms+%2B+1;+$r+%2B%2B)
{
++++$title+=+"titular_title_$r";
++++$firstName+=+"titular_firstName_$r";
++++$lastName+=+"titular_lastName_$r";
++++$phone+=+"titular_phone_$r";
++++$email+=+"titular_email_$r";
++++$bedType+=+"bedType_$r";
++++$smoker+=+"smoker_$r";

++++$titular[]+=+array(
++++++++"title"+=>+$$title,
++++++++"first_name"+=>+$$firstName,
++++++++"last_name"+=>+$$lastName,
++++++++"phone"+=>+$$phone,
++++++++"email"+=>+$$email,
++++++++"bedType"+=>+$$bedType,
++++++++"smoker"+=>+$$smoker
++++);
}|1654076|entityMap^0|A|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You can pass by reference with the operator <code>&amp;</code>. So in your example you'll have something like this

<pre><code>$string = &amp;$data["status"];
$string = &amp;$data["response"]["url"];
$string = &amp;$data["entry"]["0"]["text"];
</code></pre>

Otherwise you need to do something like this:

<pre><code>$titular = array();
for ($r = 1; $r &lt; $rooms + 1; $r ++)
{
 $title = "titular_title_$r";
 $firstName = "titular_firstName_$r";
 $lastName = "titular_lastName_$r";
 $phone = "titular_phone_$r";
 $email = "titular_email_$r";
 $bedType = "bedType_$r";
 $smoker = "smoker_$r";

 $titular[] = array(
 "title" =&gt; $$title,
 "first_name" =&gt; $$firstName,
 "last_name" =&gt; $$lastName,
 "phone" =&gt; $$phone,
 "email" =&gt; $$email,
 "bedType" =&gt; $$bedType,
 "smoker" =&gt; $$smoker
 );
}
</code></pre>

blocks|key|1439414|text|有一些原生的PHP函数:使用http://php.net/manual/ru/function.parse-str.php+(parse_str())。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1439415|在解析之前，不要忘了清理'"‘中的字符串。|1439416|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/ru/function.parse-str.php^0|E|1B|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

There are native PHP function for this:
use <a href="http://php.net/manual/ru/function.parse-str.php" rel="nofollow">http://php.net/manual/ru/function.parse-str.php</a> (parse_str()).

don't forget to clean up the string from '"' before parsing.

blocks|key|1439436|text|也许这个选项也适用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1439437|$data["entry"]["0"]["text"];
$string+=+'data["entry"]["0"]["text"]';

function+getIn($arr,+$params)
{
++++if(!is_array($arr))+{
++++++++return+null;
++++}
++++if+(array_key_exists($params[0],+$arr)+&&+count($params)+>+1)+{
++++++++$bf+=+$params[0];
++++++++array_shift($params);
++++++++return+getIn($arr[$bf],+$params);
++++}+elseif+(array_key_exists($params[0],+$arr)+&&+count($params)+==+1)+{

++++++++return+$arr[$params[0]];
++++}+else+{
++++++++return+null;
}
}

preg_match_all('/(?:(\w{1,}%7C\d))/',+$string,+$arr_matches,+PREG_PATTERN_ORDER);

array_shift($arr_matches[0]);
print_r(getIn($data,+$arr_matches[0]));|code-block|syntax|javascript|1439438|附注：这是我的工作。|1439439|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Perhaps this option is also suitable:

<pre><code>$data["entry"]["0"]["text"];
$string = 'data["entry"]["0"]["text"]';

function getIn($arr, $params)
{
 if(!is_array($arr)) {
 return null;
 }
 if (array_key_exists($params[0], $arr) &amp;&amp; count($params) &gt; 1) {
 $bf = $params[0];
 array_shift($params);
 return getIn($arr[$bf], $params);
 } elseif (array_key_exists($params[0], $arr) &amp;&amp; count($params) == 1) {

 return $arr[$params[0]];
 } else {
 return null;
}
}

preg_match_all('/(?:(\w{1,}|\d))/', $string, $arr_matches, PREG_PATTERN_ORDER);

array_shift($arr_matches[0]);
print_r(getIn($data, $arr_matches[0]));
</code></pre>

P.s. it's work for me.

blocks|key|1439473|text|您还可以使用大括号(复杂变量表示法)来实现一些技巧：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1439474|$h+=+'Happy';
$n+=+'New';
$y+=+'Year';
$wish+=+${$h.$n.$y};
echo+$wish;|code-block|syntax|javascript|1439475|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 also use curly braces (complex variable notation) to do some tricks:
<pre><code>$h = 'Happy';
$n = 'New';
$y = 'Year';
$wish = ${$h.$n.$y};
echo $wish;
</code></pre>

I've got a multidimensional associative array which includes an elements like

<pre><code>$data["status"]
$data["response"]["url"]
$data["entry"]["0"]["text"]
</code></pre>

I've got a strings like:

<pre><code>$string = 'data["status"]';
$string = 'data["response"]["url"]';
$string = 'data["entry"]["0"]["text"]';
</code></pre>

How can I convert the strings into a variable to access the proper array element? This method will need to work across any array at any of the dimensions.

Convert a String to Variable

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个多维关联数组，它包含像这样的元素$data["status"]$data["response"]["url"]$data["entry"]["0"]["text"]我有一个字符串，比如：$string = 'data["status"]';$string = 'data["response"]["url"]';...

问将字符串转换为变量
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