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include和require的区别

首先准备一个要包含的文件a.php,文件内容如下

<?php $a = 1; ?>

测试require_once,内容如下

<?phpfor($i=1; $i<=10;$i++)  {    require_once(‘a.php‘);    echo $a++;}

输出结果如下,因为只有第一次包含有效,以后的包含就都无效了

12345678910

测试require,内容如下

<?phpfor($i=1; $i<=10;$i++)  {    require(‘a.php‘);    echo $a++;}

输出结果如下,每次都要执行包含,所以输出都是1

1111111111

把require和require_once换成include和include_once执行的效果是一样的

2. include和require之间的区别只是对错误的处理方式不一样

require

<?phprequire(‘b.php‘);echo "contiue code \n";

执行结果如下,continue code这句话并没有输出,说明require包含文件如果遇到错误,后面的代码就不执行了

PHP Warning:  require(b.php): failed to open stream: No such file or directory in /home/lxy/htdocs/test.php on line 2PHP Fatal error:  require(): Failed opening required ‘b.php‘ (include_path=‘.:‘) in /home/lxy/htdocs/test.php on line 2

include

<?phpinclude(‘b.php‘);echo "contiue code \n";

执行结果如下,continue code输出了

PHP Warning:  include(b.php): failed to open stream: No such file or directory in /home/lxy/htdocs/test.php on line 3contiue code PHP Warning:  include(): Failed opening ‘b.php‘ for inclusion (include_path=‘.:‘) in /home/lxy/htdocs/test.php on line 3

 

include和require的区别