"String Operators", aka ways of appending text to strings in PHP:

"String Operators", aka ways of appending text to strings in PHP:
* https://www.php.net/manual/en/language.operators.string.php

PHP
$a = "hello";
$a = $a . " world!"; // 1. reassigning the variable
$a .= " world!";     // 2. plus-equals for strings
$a = "{$a} world!";  // 3. format strings (double quotes required)

PHP
1 2 3 4	`$a = "hello"; $a = $a . " world!"; // 1. reassigning the variable $a .= " world!"; // 2. plus-equals for strings $a = "{$a} world!"; // 3. format strings (double quotes required)`

Apparently, if concatenating multiple parts, it's better to use format string as it's internally one concatenation instead of multiple, so it's faster.