write multi line strings in php

1//use EOD function for multiple line variable
2$variable=<<<EOD
3  this is line1
4  this is line2
5  EOD;
6

1phpCopy<?php
2$mystring1 = "This is the first line." . PHP_EOL;
3$mystring2 = "This is the second line";
4$mystring1 .= $mystring2;
5echo($mystring1);
6?>
7

1phpCopy<?php
2$mystring1 = "This is the first line." . PHP_EOL;
3$mystring2 = "This is the second line" . PHP_EOL;
4$mystring3 = "This is the third line" . PHP_EOL;
5$mystring4 = "This is the fourth line" . PHP_EOL;
6$mystring5 = "This is the fifth line";
7$mystring1 .= $mystring2 .= $mystring3 .= $mystring4 .= $mystring5;
8echo($mystring1);
9?>
10

1phpCopy<?php
2echo("This is the first line \r\nThis is the third line");
3?>
4

1phpCopy<?php
2echo("This is the first line \nThis is the second line");
3?>
4

1phpCopy<?php
2echo("This is the first line \n\nThis is the third line");
3?>
4