这篇文章主要介绍了PHP嵌套输出缓冲代码实例,本文讲解嵌套使用ob系列函数的实例,需要的朋友可以参考下
PHP的输出缓存是可以嵌套的。用ob_get_level()就可以输出嵌套级别。
测试发现在cli和浏览器下输出结果不一样(PHP5.4)。
手册说明如下:
ob_get_level() will always return 0 inside a destructor.
This happens because the garbage collection for output buffers has already done before the destructor is called
想要正确输出也很简单:
复制代码 代码如下:
ob_end_clean();
echo ob_get_level(); //0
回到正题:
复制代码 代码如下:
ob_end_clean();
ob_start();
echo 'php1';//此处并不会在页面中输出
$a = ob_get_level();
$b = ob_get_contents();//获得缓存结果,赋予变量
ob_clean();
ob_start();
echo 'php2';//此处并不会在页面中输出
$c = ob_get_level();
$d = ob_get_contents();//获得缓存结果,赋予变量
ob_clean();
ob_start();
echo 'php3';//此处并不会在页面中输出
$e = ob_get_level();
$f = ob_get_contents();//获得缓存结果,赋予变量
ob_clean();
echo 'level:'.$a.',ouput:'.$b.'
';
echo 'level:'.$c.',ouput:'.$d.'
';
echo 'level:'.$e.',ouput:'.$f.'
';
结果如下:
复制代码 代码如下:
level:1,ouput:php1
level:2,ouput:php2
level:3,ouput:php3
当然,当你关闭某个级别的缓冲,如下测试:
复制代码 代码如下:
ob_end_clean();
ob_start();
echo 'php1';
$a = ob_get_level();
$b = ob_get_contents();
ob_clean();
ob_start();
echo 'php2';
$c = ob_get_level();
$d = ob_get_contents();
ob_end_clean(); //清空缓存并关闭缓存
ob_start();
echo 'php3';
$e = ob_get_level();
$f = ob_get_contents();
ob_clean();
echo 'level:'.$a.',ouput:'.$b.'
';
echo 'level:'.$c.',ouput:'.$d.'
';
echo 'level:'.$e.',ouput:'.$f.'
';
结果如下:
复制代码 代码如下:
level:1,ouput:php1
level:2,ouput:php2
level:2,ouput:php3

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