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> There are two string operators. The first is the concatenation
operator ('.'), which returns the concatenation of its right and
left arguments. The second is the concatenating assignment
operator ('.='), which appends the argument on the right side to
the argument on the left side. Please read <A
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> $a = "Hello ";
$b = $a . "World!"; // now $b contains "Hello World!"
$a = "Hello ";
$a .= "World!"; // now $a contains "Hello World!"
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