append string with number php code example

Example 1: php concat

$a = "hello";
$b = "world";
$c = $a . " " . $b;

echo $c; // hello world

Example 2: add more data to variable php

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

Example 3: Adding string with number in php

$a = "3dollars";
$b = 20;
echo $a += $b;
print($a += $b);
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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.