What is " .= " for in PHP and when to use?

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Good guys I’m with a doubt I was analyzing a code in php and saw that in a foreach is used the expression $main .= '...'; and would like to know what it is for and when to use.

php

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String concatenation

The same as:

$main = $main . '...';

Ex:

$main = 'teste';
$main .= '1';
$main .= '2';
$main .= '3';

echo $main; //irá imprimir 'teste123'

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