PHP output buffering cache and program Cache _php Tutorial

in < span=""> the < span=""> < span=""> < span=""> < span=""> < span=""> < span="">< span="">

If< span="">< span="">< span="">< span="">

Test below< span="">< span="">< span="">

In order to test the effect more clearly before the test, we< span="">< span="">< span="">< span="">

Output_buffering=off

Display_errors=on

Code< span="">< span="">

< span="">< span="">"PHP< span="">< span="">"(< span="">"content-type:text/html;charset="  < span="">    utf-8< span="">  '  ' OK< span="">  ';

It will appear

Php
Warning:cannot Modify header Information-headers already sent by (output started at d:\www\apache\htdocs\test\t2.php:2) In D:\www\apache\htdocs\test\t2.php on line 3
Ok

Code Listing 2:

< span="">< span="">< span="">< span="">< span="">"PHP< span="">< span="">"(< span="">"content-type:text/html;charset="  < span="">    utf-8< span="">  '  ' OK< span="">  ';

The result is completely correct.

Cause Analysis:

< span=""> code phpecho< span="">' php ' has sent a header message to the < span=""> browser,

When it comes back

Header ("content-type:text/html;charset= ' Utf-8 '");

Also saw a header message, this time has been called back to the above information, can not be more wrong.

< span=""> code ' < span=""> < span=""> < span=""> < span=""> PHP ' When the data to be called to the browser is first placed in< span="">< span="">< span="">< span="">< span="">< span="">

See the following code for a deeper understanding

Code< span="">< span="">

< span="">< span="">< span="">"PHP"< span="">< span="">("content-type:text/html;charset= ' Utf-8 '"  < span=""> )  < span="">  ' OK '  < span="">    < span="">
           
   '< span="">< span="">=< span="">< span="">< span=""> < span="">;

Will output

Ob_get_contents ()< span="">< span="">< span="">

Ob_get_contents ()< span="">< span="">< span="">

Code< span="">< span="">

< span="">< span="">< span="">< span="">< span="">"PHP< span="">< span="">"(< span="">);  < span="">  < span=""> ( " content-type:text/ < span="">  < span=""> html;charset=  < span="">    < span="">  '  utf-8< span="">  ' ' OK '  < span=""> < span="">< span=""> '
                    
   '< span="">< span="">< span="">=< span="">< span=""> < span="">< span="">< span="">;

Results:

Code< span="">< span="">

< span="">< span="">< span="">"PHP"< span="">< span="">();  < span="">  ( < span="">" content-type:text/html;charset= ' utf-8 '"  < span="">    ' OK< span="">  ' < span="">    < span=""> < span=""> 
              
   '< span="">< span="">=< span="">< span="">< span=""> < span="">;

Results:

Code< span="">< span="">

< span="">< span="">< span="">"PHP"< span="">< span="">();  < span="">  ( < span="">" content-type:text/html;charset= ' utf-8 '"  < span="">    ' OK< span="">  ' < span="">    < span=""> < span=""> 
              
   '< span="">< span="">=< span="">< span="">< span=""> < span="">;

Code< span="">< span="">< span="">< span="">< span="">< span="">

< span="">< span="">< span="">"PHP"< span="">< span="">();  < span="">  ( < span="">" content-type:text/html;charset= ' utf-8 '"  < span="">    ' OK< span="">  ' < span="">    < span=""> < span=""> 
              
   '< span="">< span="">=< span="">< span="">< span=""> < span="">;

Results:

Ob_clean ()

Empty< span="">< span="">

Ob_get_flush ()

Flush out cache to program cache, close< span="">< span="">

Code< span="">

< span="">< span="">< span="">' abc '< span="">< span="">("content-type:text/html;charset= ' Utf-8 '"  < span="">)   < span=""> ' Hello  ' < span="">  < span="">  < span="">  < span=""> ' AA '< span="">< span="">< span="">< span="">< span="">< span="">

2.ob_flush (), Flush ()< span="">

Code< span="">< span="">

< span="">< span="">< span="">' A '< span="">< span="">();< span="">< span="">< span="">< span="">< span="">< span="">< span="">

Code< span="">< span="">

< span="">< span="">< span="">' A '< span="">< span="">(); < span="">< span="">< span=""> "
Ob_con ".< span="">< span="">< span="">< span="">

< span="">

Code< span="">< span="">

< span="">< span="">("", 1024);  < span="">(=0  ;  < span=""> < span="">  < span="">  < span=""> <5; < span="">++< span="">< span="">< span="">< span=""> < span=""> "
< span="">"(< span="">1< span="">< span="">< span="">

Will output a number in a second.

If not< span="">< span="">

http://www.bkjia.com/PHPjc/440408.html www.bkjia.com true http://www.bkjia.com/PHPjc/440408.html techarticle in order to test the effect more clearly before testing in the following test, we output_buffering=off display_errors=on code "PHP" ("content-type:text/html;charset=" Utf-8 ' ' OK '; It will come out ...

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