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Return value rules for custom PHP functions: All functions must return a value (can be NULL). Use the return keyword or implicitly return the last expression value. The return value must be the value itself, not a reference.
The return value of a custom PHP function: rules and practice
In PHP, the return value of a custom function follows certain rules Rules to ensure code maintainability and predictability.
Rules:
NULL
). NULL
by default. return
keyword to return a value, or you can have the function implicitly return the value of the last expression. Practical case:
Create a custom function calculateSum()
, which calculates the sum of two numbers:
<?php function calculateSum($num1, $num2) { $sum = $num1 + $num2; return $sum; // 显式地返回和 } // 使用函数 $result = calculateSum(5, 10); echo "The sum is: $result"; // 输出 15 ?>
In this example, the function calculateSum()
returns the calculated sum of type int
. It uses the return
keyword to explicitly specify the return value.
Note:
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