How can developers improve code readability and maintainability when integrating JavaScript functions into PHP applications for form manipulation?

To improve code readability and maintainability when integrating JavaScript functions into PHP applications for form manipulation, developers can separate the JavaScript code into its own file and include it in the PHP file using the <script> tag. This way, the PHP file remains clean and easy to read, while the JavaScript functions are organized and reusable. 

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Form Manipulation&lt;/title&gt;
    &lt;script src=&quot;formManipulation.js&quot;&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;form id=&quot;myForm&quot;&gt;
        &lt;input type=&quot;text&quot; name=&quot;username&quot; placeholder=&quot;Username&quot;&gt;
        &lt;input type=&quot;password&quot; name=&quot;password&quot; placeholder=&quot;Password&quot;&gt;
        &lt;button onclick=&quot;validateForm()&quot;&gt;Submit&lt;/button&gt;
    &lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;

Keywords

JavaScript functions PHP applications form manipulation code readability maintainability

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