实例比较PHP中include和require的区别
程序员文章站
2022-05-08 22:13:56
...
网上太多关于PHP中include与require区别。然而事实真的如此吗,今天我们就通过一个具体的实例来简单分析验证下
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。
以上就是实例比较PHP中include和require的区别的详细内容,更多请关注其它相关文章!
上一篇: 数据库水平切分的两个思路
下一篇: 认识并使用PHP超级全局变量
推荐阅读
-
JSP中include指令和include行为的区别
-
java中静态变量和实例变量的区别详细介绍
-
php中require和require_once的区别说明
-
Android MotionEvent中getX()和getRawX()的区别实例详解
-
PHP中isset与array_key_exists的区别实例分析
-
php中数字0和空值的区别分析
-
php中curl和file_get_content的区别
-
php中$_SERVER[PHP_SELF] 和 $_SERVER[SCRIPT_NAME]之间的区别
-
详解PHP中strlen和mb_strlen函数的区别
-
PHP中strlen()和mb_strlen()的区别浅析