php try catch finally 结构

PHP异常处理详解

最新推荐文章于 2023-09-16 02:33:45 发布

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本文通过三个PHP代码示例详细解析了异常处理机制中try、catch和finally块的执行流程及返回值特点，尤其是在finally块中return语句的影响。

code 1

<?php
    function foo(){
        $bar = 1;
        try{
            throw new Exception('I am Wu Xiancheng.');
        }catch(Exception $e){
            return $bar;
            $bar--; // this line will be ignored
        }finally{
            $bar++;
        }
    }
    echo foo(); // 2
?>

code 2

<?php
    function foo(){
        $bar = 1;
        try{
            throw new Exception('I am Wu Xiancheng.');
        }catch(Exception $e){
            return $bar;
            $bar--; // this line will be ignored
        }finally{
            $bar++;
            return $bar;
        }
    }
    echo foo(); //2 
?>

code 3

<?php
    function foo(){
        $bar = 1;
        try{
            throw new Exception('I am Wu Xiancheng.');
        }catch(Exception $e){
            return $bar;
            $bar--; // this line will be ignored
        }finally{
            return 100;
        }
    }
    echo foo(); //100
?>