There are various kinds of buffer. buffer in PHP , in apache server , and in brower .There are something diferences.
In PHP there are some function and option about buffer for example: ob_start().etc.
Two option about buffer in php.ini is :
1. output_buffering: you can set it to on , off ,or int number .
2.implicit_flush: you can set it to on/off .when you set it on , then it will fllow a flush() behind echo .
The diference about flush() and ob_flush()
1.when you use flush(). it will immediately output the buffer cached in the server (for example: apache server);
2.And use ob_flush(), it will immediately output the buffer cached in PHP.
3.You should use ob_flush() first, The PHP buffer will output to server cache ,but it havn\\\’t output to brower already , The use flush() , It will output to brower.
A example just like something below :
output a number every second:
ob_start() //start buffer for ($i = 0;$i<10;$i ){ echo "$i<br />"; ob_flush(); //flush buffer flush(); //then flush server buffer sleep(); //sleep servel seconds }
but if you use browser to access this code . it usually don\\\’t output variable immediately , then we can add more space let the output bigger than 4096bytes :
ob_start() //start buffer for ($i = 0;$i<10;$i ){ echo str_repeat(\\\’ \\\’,4096);//output 4096 space to let the brower output the $i immediately echo "$i<br />"; ob_flush(); //flush buffer flush(); //then flush server buffer sleep(); //sleep servel seconds }
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