What is the difference between echo and print in PHP?

Both echo and print are used to output data in PHP, but they have key differences. echo is a language construct (not strictly a function), can accept multiple comma-separated arguments (echo "Hello", " World";), and has no return value — it is marginally faster. print also a language construct, always returns 1, making it usable in expressions: $x = print("Hello");. It accepts only one argument. In practice, echo is used far more commonly. Neither requires parentheses for a single argument, though you can use them for clarity.