How can PHP developers troubleshoot issues related to PHP variables not being recognized in HTML forms?

When PHP variables are not being recognized in HTML forms, it is likely due to incorrect syntax or scope issues. To troubleshoot this problem, developers should ensure that the PHP variables are properly echoed within the HTML form elements using the `echo` or `<?= ?>` tags. Additionally, developers should check that the variables are defined before being used in the form. 

&lt;?php
// Define the PHP variable
$name = &quot;John Doe&quot;;

// Echo the variable within the HTML form
?&gt;
&lt;form action=&quot;submit.php&quot; method=&quot;post&quot;&gt;
    &lt;input type=&quot;text&quot; name=&quot;username&quot; value=&quot;&lt;?= $name ?&gt;&quot;&gt;
    &lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt;
&lt;/form&gt;

Keywords

PHP variables HTML forms troubleshooting recognition

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