blocks|key|2436037|text|为什么不直接用这个呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2436038|<div+id="myName">
+++<?php
+++if(isset($_SESSION['name'])+&&+$_SESSION['name']+!=+''){
+++++++echo+$_SESSION['name'];
+++}
+++else
+++++++echo+"NotSet";
+++?>;
</div>|code-block|syntax|javascript|2436039|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|$]]

<p>Why not just use this?</p>

<pre><code>&lt;div id="myName"&gt;
   &lt;?php
   if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){
       echo $_SESSION['name'];
   }
   else
       echo "NotSet";
   ?&gt;;
&lt;/div&gt;
</code></pre>


blocks|key|1960|text|如果你的代码是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1961|<div+id="myName">
<scrpit+type="text/javascript">
+++var+myName+=+<?php
+++if(isset($_SESSION['name'])+&&+$_SESSION['name']+!=+''){
+++++++echo+$_SESSION['name'];
+++}
+++else
+++++++echo+"Not+Set";
+++?>;
</script>
</div>|code-block|syntax|javascript|1962|那么预期的结果只能是|1963|<div+id="+myName">
++++<script+type="text/javascript">
++++++++var+myName+=+RESULT+OF+PHP+CODE+HERE
++++</script>
</div>|1964|如果您想要问题中描述的预期输出，请将HTML/php更改为|1965|<div+id="myName">
+++<?php
+++if(isset($_SESSION['name'])+&&+$_SESSION['name']+!=+''){
+++++++echo+$_SESSION['name'];
+++}
+++else
+++++++echo+"Not+Set";
+++?>;
</div>|1966|编辑|1967|在发帖后，我看到了另一个答案的评论。你想在两个地方使用这个变量，所以如果name会话变量没有改变，你必须将php逻辑的结果存储在某个地方，并且/或者如果它可以改变，你必须创建一个函数来获取它。|offset|length|style|CODE|1968|一个这样的例子|1969|<?php
++++function+getNameFromSession()+{
++++++++if(isset($_SESSION['name'])+&&+$_SESSION['name']+!=+''){
++++++++++++return+$_SESSION['name'];
+++++++}
+++++++else
++++++++++++return+"Not+Set";
++++}

++++$myName+=+getNameFromSession();
?>

<div+id="+myName">
++++<?php+echo+$myName;+?>
++++<script+type="text/javascript">
++++++++var+myName+=+"<?php+echo+$myName;+?>";
++++</script>
</div>|1970|请注意，在任何情况下，您的脚本在元素中可能会更好。|1971|entityMap^0|0|0|0|0|0|0|0|10|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@$S|1C|T|1D|U|V]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1G|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|13|$]]

<p>If your code is</p>

<pre><code>&lt;div id="myName"&gt;
&lt;scrpit type="text/javascript"&gt;
   var myName = &lt;?php
   if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){
       echo $_SESSION['name'];
   }
   else
       echo "Not Set";
   ?&gt;;
&lt;/script&gt;
&lt;/div&gt;
</code></pre>

<p>Then the expected result can only be</p>

<pre><code>&lt;div id=" myName"&gt;
    &lt;script type="text/javascript"&gt;
        var myName = RESULT OF PHP CODE HERE
    &lt;/script&gt;
&lt;/div&gt;
</code></pre>

<p>If you want the expected output as described in your question, change your HTML/php to</p>

<pre><code>&lt;div id="myName"&gt;
   &lt;?php
   if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){
       echo $_SESSION['name'];
   }
   else
       echo "Not Set";
   ?&gt;;
&lt;/div&gt;
</code></pre>

<p>EDIT</p>

<p>After posting I saw the comments on another answer. You want to use the variable in two places so you have to store the result of your php logic somewhere if the <code>name</code> session variable doesn't change and/or make a function to get it if it can change.</p>

<p>For one such example</p>

<pre><code>&lt;?php
    function getNameFromSession() {
        if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){
            return $_SESSION['name'];
       }
       else
            return "Not Set";
    }

    $myName = getNameFromSession();
?&gt;

&lt;div id=" myName"&gt;
    &lt;?php echo $myName; ?&gt;
    &lt;script type="text/javascript"&gt;
        var myName = "&lt;?php echo $myName; ?&gt;";
    &lt;/script&gt;
&lt;/div&gt;
</code></pre>

<p>Note that in any case your script would probably be better off in the  element.</p>


blocks|key|1760|text|您可以将PHP数据指定为一个JavaSscript变量，如下所示-它将根据需要用于进一步的客户端处理，并且您可以使用标准方法更新DOM以反映内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1761|<html>
++++<head>
++++++++<title>php+&+js+vars</title>
++++</head>
++++<body>
++++<div+id='myName'>
++++++++<script>
++++++++++++<?php
++++++++++++++++printf(+'var+myName="%25s";',+!empty(+$_SESSION['name']+)+?+$_SESSION['name']+:+'NotSet'+);
++++++++++++?>
++++++++++++document.getElementById('myName').innerHTML=myName;
++++++++++++alert(+myName+);//+var+still+available...
++++++++</script>
++++</div>
++++</body>
</html>|code-block|syntax|javascript|1762|更新|1763|上面的代码片段是匆忙编写的，几乎没有考虑到它可能中断的各种方式，但是为了适应双引号，您可以使用htmlentities|offset|length|style|CODE|1764|<?php
++++session_start();
++++$_SESSION['name']='Geronimo"s+Revenge';
?>
<html>
++++<head>
++++++++<title>php+&+js+vars</title>
++++</head>
++++<body>
++++<div+id='myName'>
++++++++<script>
++++++++++++<?php
++++++++++++++++printf(+'var+myName="%25s";',+!empty(+$_SESSION['name']+)+?+htmlentities(+$_SESSION['name'],+ENT_QUOTES+++)+:+'NotSet'+);
++++++++++++?>
++++++++++++document.getElementById('myName').innerHTML=myName;
++++++++</script>
++++</div>
++++</body>
</html>|1765|entityMap^0|0|0|0|1B|C|0|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]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<p>You could assign the PHP data as a JavaSscript variable like this - it will be available for further client side processing as desired and you can update the DOM to reflect the content using standard methods.</p>

<pre><code>&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;php &amp; js vars&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
    &lt;div id='myName'&gt;
        &lt;script&gt;
            &lt;?php
                printf( 'var myName="%s";', !empty( $_SESSION['name'] ) ? $_SESSION['name'] : 'NotSet' );
            ?&gt;
            document.getElementById('myName').innerHTML=myName;
            alert( myName );// var still available...
        &lt;/script&gt;
    &lt;/div&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>

<h2>Update</h2>

<p>The above snippet was written in haste with little thought given to the various ways in which it could break, but to accommodate for double quotes you could make use of <code>htmlentities</code></p>

<pre><code>&lt;?php
    session_start();
    $_SESSION['name']='Geronimo"s Revenge';
?&gt;
&lt;html&gt;
    &lt;head&gt;
        &lt;title&gt;php &amp; js vars&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
    &lt;div id='myName'&gt;
        &lt;script&gt;
            &lt;?php
                printf( 'var myName="%s";', !empty( $_SESSION['name'] ) ? htmlentities( $_SESSION['name'], ENT_QUOTES   ) : 'NotSet' );
            ?&gt;
            document.getElementById('myName').innerHTML=myName;
        &lt;/script&gt;
    &lt;/div&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>


blocks|key|1825|text|<div+id="myName">

</div>

<scrpit+type="text/javascript">
+++<?php
+++if(isset($_SESSION['name'])+&&+$_SESSION['name']+!=+''){+?>
+++++++var+myName+=<?php+echo+$_SESSION['name'];?>+;
+++<?php+}
+++else{
++?>
++++++var+myName+=+"NotSet";
+++<?php+}+?>;
++document.getElementById("myName").innerHTML=myName+;

document.write(myName);
</script>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1826|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>&lt;div id="myName"&gt;

&lt;/div&gt;

&lt;scrpit type="text/javascript"&gt;
   &lt;?php
   if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){ ?&gt;
       var myName =&lt;?php echo $_SESSION['name'];?&gt; ;
   &lt;?php }
   else{
  ?&gt;
      var myName = "NotSet";
   &lt;?php } ?&gt;;
  document.getElementById("myName").innerHTML=myName ;

document.write(myName);
&lt;/script&gt;
</code></pre>


<p>I have a HTML page with a script tag with PHP in it as follows:</p>

<pre><code>&lt;div id="myName"&gt;
&lt;script type="text/javascript"&gt;
   var myName = &lt;?php
   if(isset($_SESSION['name']) &amp;&amp; $_SESSION['name'] != ''){
       echo $_SESSION['name'];
   }
   else
       echo "NotSet";
   ?&gt;;
document.write(myName);
&lt;/script&gt;
&lt;/div&gt;
</code></pre>

<p>But running this actually prints like below:</p>

<pre><code>&lt;div id="myName"&gt;
    var myName=SomeName;
    document.write(myName);
&lt;/div&gt;
</code></pre>

<p>Expected:</p>

<pre><code>&lt;div id="myName"&gt;
    SomeName
&lt;/div&gt;
</code></pre>

<p>On doing inspect element:</p>

<pre><code>&lt;div id="myName"&gt;
&lt;script type="text/javascript"&gt;
    "var myName=SomeName;
    document.write(myName);"
&lt;/script&gt;
&lt;/div&gt;
</code></pre>

<p>I want to post-process the variable myName and derive other values ahead in JS logic. So, I need to get the php value in JS variable.</p>

<p>Please note: I am not asking how to get a PHP variable into JS variable (for which there are many different questions on Stack Overflow). This is a different question and hence <strong>not a duplicate</strong> for those questions.</p>


Echoing PHP variable into JavaScript variable prints the PHP variable in HTML

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。

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我有一个HTML页面，里面有一个脚本标签，里面有PHP，如下所示：<div id="myName"><script type="text/javascript">   var myName = <?php   if(isset($_SESSION['name']) && $_SESSION['name'] != '')...

问将PHP变量回显到JavaScript变量中，在HTML语言中打印PHP变量
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