How do PHP functions return constants?

PHP functions use the return statement to return constants, which are named values ​​that cannot be changed. Syntax: return constant_name; 1. Define a constant; 2. Create a function that returns the constant; 3. Use the return keyword followed by the constant name to return the constant.

#How do PHP functions return constants?

In PHP, you can return constants through the return statement. Constants are named values ​​whose values ​​cannot be changed during script execution. To return a constant, you simply use the return keyword followed by the name of the constant.

Grammar:

return constant_name;

Practical case:

Suppose we have a named MY_CONSTANT Constant, which is defined as the string "Hello World". We can create a function that returns the constant:

<?php
define('MY_CONSTANT', 'Hello World');

function getConstant() {
  return MY_CONSTANT;
}

echo getConstant(); // 输出 "Hello World"
?>

Please note:

• Constant names do not use the dollar sign ($).
• Constants must be defined before the script is executed.
• Attempts to change the value of a constant will generate an error.

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