Php ต้องใส่...รากของรูเบอ 2 ข้อความ

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php ต้องใส่...รากของรูเบอ 2 ข้อความ

<?php
$a = "Hello ";
$b = $a . "World!"; // now $b contains "Hello World!"

$a = "Hello ";
$a .= "World!";     // now $a contains "Hello World!"

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