Pass PHP array to Javascript array: Json, join, implode

I am working on a plugin and I need to pass PHP array to Javascript array. I have tried using join(), implode() and even Json_encode. But, the wordpress is not displaying any value.

When using join(), I used the code:

<?php
$php1 = array(1,2,3);

?>
<script language='Javascript'>
var lat = ["<?php echo join("\", \"", $php1); ?>"];
document.write(lat[1]);
</script>

If used on localhost(without wordpress), the above code provides a valid output. But, somehow, its not working on WordPress. The “apache error log” show this message:

PHP Warning: join() [function.join]: Invalid arguments passed in \wp-content\plugins\Animation\animation.php on line 129, referer: https://localhost/Website/wp-admin/options-general.php?page=js

Same is the case with implode(). Server error log shows same above warning for implode().

Then I tried for json_encode using the code below:

var lat = <?php echo json_encode($php1); ?>;

But the no value is returned.

Please guide me through this. I appreciate any help. It would be great if you help me in passing this PHP array to javascript array.