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How can PHP variables be properly concatenated in a string?

To properly concatenate PHP variables in a string, you can use the dot (.) operator to join the variables with the string. This allows you to insert variable values into a string without breaking the syntax. Make sure to enclose the entire expression in double quotes to allow for variable interpolation.

php 
$name = "John";
$age = 30;
echo "My name is " . $name . " and I am " . $age . " years old.";

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