What are some best practices for concatenating strings in PHP to improve code readability and maintainability?

When concatenating strings in PHP, it is important to use clear and concise syntax to improve code readability and maintainability. One best practice is to use the concatenation operator (.) instead of using the concatenation function (concat). Additionally, breaking long concatenated strings into multiple lines can make the code easier to read. Lastly, consider using double quotes for string interpolation when concatenating variables within a string. 

// Concatenating strings using the concatenation operator (.)
$firstName = "John";
$lastName = "Doe";
$fullName = $firstName . " " . $lastName;

// Breaking long concatenated strings into multiple lines
$message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
         . "Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";

// Using double quotes for string interpolation
$age = 30;
$name = "Alice";
$greeting = "Hello, my name is $name and I am $age years old.";

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