update with variable php code example

Example 1: how to get a variable from php to javascript

<script type="text/javascript">
// boolean outputs "" if false, "1" if true
var bool = "<?php echo $bool ?>"; 

// numeric value, both with and without quotes
var num = <?php echo $num ?>; // 7
var str_num = "<?php echo $num ?>"; // "7" (a string)

var str = "<?php echo $str ?>"; // "A string here"
</script>

Example 2: define a variable in mysql from select

SELECT salary INTO @variable1 FROM employee_info WHERE emp_id = 12345678 LIMIT 1;
SELECT salary, salary_group INTO @var1, @var2 FROM employee_info WHERE emp_id = 12345678;