concat string and number in php code example

Example 1: add more data to variable php

$a = "Hello ";
$a .= "World!";

Example 2: join string php

<?php
$arr = array('Hello','World!','Beautiful','Day!');
echo join(" ",$arr);
?>

Example 3: Adding string with number in php

$a = "3dollars";
$b = 20;
echo $a += $b;
print($a += $b);
------------------------------
It casts '3dollars' as a number, getting $a = 3.

When you echo, you add 20, to $a, so it prints 23 and $a = 23.

Then, when you print, you again add 20, so now $a = 43.