The role of return in php

The return statement in PHP is used to terminate function execution and return a value: terminate function execution. Returns the specified value or NULL (no return value). Avoid code duplication. Note: The return value should not be used for void type functions, and caution should be used when using it in conditional statements.

The role of return in PHP

In PHP programming, the return statement is used to terminate function execution and report to Calling a function returns a value.

Detailed explanation of the function

• # Terminate function execution: Once the return statement is executed, it will immediately terminate the execution of the current function and transfer control Returned to the calling function.
• Return value: The return statement can be followed by an expression to indicate the value to be returned. This value can be a constant, variable, object, or other data type.
• Multiple return statements: You can have multiple return statements in a function, as long as you ensure that they do not appear in the same control flow path. Each return statement terminates function execution and returns the corresponding value.
• No return value: If no return value is specified, the function will return NULL.
• Avoid code duplication: Using the return statement can avoid repeatedly writing the same code in the function, thereby improving the readability and maintainability of the code.

Example

function sum($a, $b) {
  return $a + $b;
}

$result = sum(5, 10);
echo $result; // 输出：15

Note

• If the function is declared as void type, then no Any value should be returned using the return statement.
• When using the return statement in a conditional statement, make sure it does not produce unexpected results.

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