Two Ways of Passing Multiline Strings from PHP to JavaScript

PHP and JavaScript are both beginners. Recently, there is such a demand:

For example, there is a multi-line string with one PHP:

$a = <<<EOF 
thy38 
csdn 
blog 
EOF;

Passed to JavaScript is equivalent to:

var c='thy38\n\ 
csdn\n\ 
blog';

Because the understanding of these two languages is so low that I don't know how to Google, I have to find two ways:

1. Escape PHP first, then split it, then turn it to JSON, then JavaScript parse, and finally splice it with\ n.

var b=JSON.parse(<?php echo '\''.json_encode(explode("\r\n", $a)).'\''; ?>).join('\n'); 
alert(b==c); 

2. Arrange a hidden input on the page, then give it the value by php first, and then read it by JavaScript, thus realizing multi-line value transfer

<input type="hidden" id='testphp' value="<?php echo $a?>" /> 
var a=document.getElementById("testphp").value; 
var b=JSON.parse(<?php echo '\''.json_encode(explode("\r\n", $a)).'\''; ?>).join('\n'); 
alert(a==b); 
alert(b==c); 

PS: The above method was gradually obtained in the discussion with a classmate of PHP plus JavaScript programmers.
After writing the article, think back. In fact, these two methods are still due to the incomprehension of PHP and JavaScript multi-line strings.
It is simple to understand thoroughly, far from being so complicated, just replace the string directly:

var d=<?php echo '\''.str_replace("\r\n", "\\n\\\n", $a).'\''; ?>; 
alert(d==c);