2. Caching mechanisms

<?phpecho ‘hello100‘;header(‘content-type:text/html;charset=utf-8‘);echo ‘hello200‘;

Solution:

1.把heander()信息放在头部2.打开 ob 缓冲

How to open the OB cache:

1.在 php.ini 中打开2. ob_start()

ob1.php

<?php  //open OB cache  ob_start (); echo   ' hello100 ' ; header ( content-type:text/html;charset= Utf-8 ' ); echo   ' hello200 ' ; echo   ' hello300 ' ; //gets the data of the OB cache   $str  = Ob_get_contents (); //save $str to File  file_put_contents (, Span class= "hljs-variable" > $str ); echo   ' hello400 ' ; echo   ' hello500 ' ; echo   ' hello600 ' ;  

Wjh.log

hello100hello200hello300

several principles:

Situation cache:

<?php//Open OB cacheOb_start ();Echo ' hello100 '; Header (' Content-type:text/html;charset=utf-8 ');Echo ' hello200 ';Echo ' hello300 ';//Empty OB cacheOb_clean ();//Get OB-Cached data$str= Ob_get_contents ();//Save the $STR to a fileFile_put_contents (' Wjh.log ',$str);Echo ' hello400 ';Echo ' hello500 ';Echo ' hello600 ';

<?php//Open OB cacheOb_start ();Echo ' hello100 '; Header (' Content-type:text/html;charset=utf-8 ');Echo ' hello200 ';Echo ' hello300 ';//Empty OB cache//ob_clean ();//The function is to empty the data in the OB and close the OB cacheOb_end_clean ();Echo ' hello400 ';//Get OB-Cached data$str= Ob_get_contents ();//Save the $STR to a fileFile_put_contents (' Wjh.log ',$str);Echo ' hello500 ';Echo ' hello600 ';

<?php//Open OB cacheOb_start ();Echo ' hello100 '; Header (' Content-type:text/html;charset=utf-8 ');Echo ' hello200 ';Echo ' hello300 ';//Empty OB cache//ob_clean ();//The function is to empty the data in the OB and close the OB cache//ob_end_clean ();Ob_clean ();Echo ' hello400 ';//Get OB-Cached data$str= Ob_get_contents ();//Save the $STR to a fileFile_put_contents (' Wjh.log ',$str);Echo ' hello500 ';Echo ' hello600 ';

<?php//开启ob缓存ob_start();echo‘hello100‘;header(‘content-type:text/html;charset=utf-8‘);echo‘hello200‘;//把 ob 缓存的数据，刷新到程序缓存 ,并关闭echo‘hello300‘;$str = ob_get_contents();file_put_contents(‘wjh.log‘,$str//所以文件为空echo‘hello500‘;echo‘hello600‘;

<?php//Open OB cacheOb_start ();Echo ' hello100 '; Header (' Content-type:text/html;charset=utf-8 ');Echo ' hello200 ';//Put the OB cache data, flush it to the program cache, and close//ob_end_flush ();//Set OB cache data, flush to program cache, do not closeOb_flush ();Echo ' hello300 ';$str= Ob_get_contents (); File_put_contents (' Wjh.log ',$str);//So the file is emptyEcho ' hello500 ';Echo ' hello600 ';

2. Caching mechanisms