一个例子简要说明include和require的区别
2024-09-07 04:24:55
先编辑command.php文件
echo 'hello'.PHP_EOL;
然后编辑console.php文件
for($i=1;$i<=3;++$i){
require 'command1.php';
}
原本想要包含并执行这个echo,没想到写错了文件名,如果是require,会报出这样的错误:
Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4 Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4
PHP Warning: require(command1.php): failed to open stream: No such file or directory in console.php on line 4
PHP Fatal error: require(): Failed opening required 'command1.php' (include_path='.') in console.php on line 4
如果把require改为include
for($i=1;$i<=3;++$i){
include 'command1.php';
}
会报出这样的错误:
Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4 Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4 Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4
PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4
PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4
PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4
PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4
PHP Warning: include(command1.php): failed to open stream: No such file or directory in console.php on line 4
PHP Warning: include(): Failed opening 'command1.php' for inclusion (include_path='.') in console.php on line 4
如果使用require_once或者include_once,只要包含路径正确,那么循环只执行一次。
总结:
使用require,如果文件没有包含成功,就会报出一个fatal error,整个程序就中止了。
使用include,如果文件没有包含成功,就会报出一个普通的warning,之后的代码仍会执行。
如果你的Web程序使用了MVC这种对文件包含强依赖的设计方法,请使用require_once。
最新文章
- JMeter学习-025-JMeter 命令行(非GUI)模式详解(三)-测试图形化 HTML 报表(dashboard)生成
- 客户端JS性能的一些优化的小技巧
- asp.net 加载xml到menu
- ThoughtWorks 2016年第1期DNA活动总结
- Java基础——数组Array
- 二十、ValueStack的常用方法
- 【学习笔记】【C语言】标识符
- 彻底理解Cisco/Linux/Windows的IP路由
- 利用Keil u4调试,精确实现软件延时
- Hbase配置中出现的问题总结
- WebStorm中Node.js项目配置教程(1)——创建项目
- 转 s3c2440硬件学习----内存管理单元MMU
- 剑指offer反转链表
- 10、借助POI实现Java生成并打印excel报表(1)
- [bzoj3910] 火车
- Exp1 PC平台逆向破解 20165235 祁瑛
- struts2+dojo实现datagrid
- Linux 变量的使用
- 标准库中 vector list等排序
- Codeforces.547C.Mike and Foam(容斥/莫比乌斯反演)