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Concatenation

Concatenation operator concatenate right and left arguments.
 
$a = "a"; 
$b = "b";

echo $a . $b; // ab

Special

PHP has a special operator that can be used to concatenate two strings.
 
$a = "a";
$b = "b";

echo $a .= $b; // ab

# Using the + operator, like in Java ...
# will result in TypeError (PHP 8+)

echo $a += $b; // Unsupported operant types

Questions    
Operators, Comparison