$a = "Hello"; $b = $a. "World !"; / / now $b contains "Hello World! "$a = "Hello"; $a .= "World !"; / / now $a contains "Hello World! "
?php $a = "Bonjour"; $b = $a. "Monde !"; / / $b contient "Bonjour Monde! "$a = "Bonjour"; $a = $a. "Monde !"; / / $a contient "Bonjour Monde! "?