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Php variable as javascript function parameter in echo

Javascript php variable

<script type="text/javascript">
   var php_var = "<?php echo $php_var; ?>";
</script>

Php variable as javascript function parameter in echo

<?php echo "<script> autoFill(".$dropDown.", ".$emptyDropDown."); </script>"; ?>

Php echo call javascript function with parameters

// Most effective way to call a javascript function with parameter of PHP variable
echo '<input type="button" value="Button" onclick="return openEditor(\'' . $path_image . '\')">';

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