The Concatenation Operator? (PHP)

[Otaku Ichise]

<?php
$txt1="Hello World!";
$txt2="What a horrible day!";
echo $txt1 . " " . $txt2;
?>

Some can explain me what can we do with this Operator? and in wich cases should we call this Operator?

[Taigatespeext]

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[fedekiller]

If you are still interested, concatenation is an binary operation between two strings, binary operations are the ones which affect two elements, in this case, strings, but if you think about numbers, you already know some binary operators, for example, + , -, *, /
I will use . as the concatenation operator
2 + 2 = 4
2 . 2 = 22

2 . = Bad
.2 = Bad

So basically what it does is put the second element after the first, concatenation operator in PHP is . so

Code:

$var1 = "hello";
$var2 = " world!";
$var3 = $var1.$var2; // hello world!

Hope that helps