What are the common return value types of PHP functions?

PHP functions can return multiple types of data, including Boolean values, integers, floating point numbers, strings, arrays, objects and null values.

Common types of PHP function return types

PHP functions can return various types of data, including:

• Boolean value (bool) : true or false
• Integer (int) : positive Number, negative number or 0
• Float number (float) : Number with decimal point
• String (string) : Composed of a sequence of characters Text
• Array: An ordered or associated set of data elements
• Object(object): Represents an instance of a real-world entity
• Null value (null): Indicates the situation where there is no value

Practical case

The following code shows A function that returns a Boolean value indicating whether the user is an adult based on a given age:

function isAdult($age) {
  return $age >= 18;
}

// 使用函数
if (isAdult(21)) {
  echo "用户已成年";
} else {
  echo "用户未成年";
}

In this example, the isAdult() function returns a Boolean value, true means the user is an adult, false means the user is not an adult.

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