How to combine PHP and JavaScript?

How to combine PHP and Java Script
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Suppose you need to transfer the value of PHP variables to the JavaScript function. Let’s assign values to two variables in the following way:

<?php 

$mess = "Your query is being processed..."; 
$lang = "EN";

?>

Now let’s write the following in the HTML-code:

<form method="POST" 
	action="#" enctype="multipart/form-data" 
	name="dosearch" id="dosearch" onSubmit="return false"
>

<input type="text" size="70" name="search" id="search">

<input style="width:110px"  name="button" type="button" value="Search"  
onclick="doLoad(document.getElementById('dosearch'),
'<?php echo $mess; ?>','<?php echo $lang; ?>')"></p>

</form>


At the opening of the page, vaues of variables $mess and $lang will be written in HTML-code and, when pressing the button of the form, they will be transferred to the JavaScript function.

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