Quick Answer
echo: outputs one or more strings, slightly faster, no return value, can use without parentheses. print: outputs one string and returns 1, can be used in expressions. In practice they're interchangeable for simple output. echo is more commonly used. Neither is a function - both are language constructs. echo "Hello"; is the standard way to output text in PHP.
Answer
echo outputs text faster and accepts multiple parameters. print returns 1 and can be used in expressions.
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Verified Answer
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