PHP Seven kinds of cache control output instance code

PHP tutorial Seven kinds of cache control output instance code
Depending on whether the cache is open or not, there are several different ways to do this:

Note: The following code does not consider the IE cache must be greater than 256 bytes to output the problem, such as in IE test, please add a sentence in the code: "Echo str_repeat (", 256)

Writing 1:
Output_buffering = Off
Implicit_flush=off

For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Flush ();
Sleep (1);
}

Writing 2:
Output_buffering = On
Implicit_flush=off

For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Ob_flush ();
Flush ();
Sleep (1);
}

Writing 3:
Output_buffering = Off
Implicit_flush=off

Ob_start ();
For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Ob_flush ();
Flush ();
Sleep (1);
}

Writing 4:
Output_buffering = On
Implicit_flush=off

Ob_end_flush ();
For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Flush ();
Sleep (1);
}

Writing 5:
Output_buffering = On
Implicit_flush=off

Ob_end_clean ();
For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Flush ();
Sleep (1);
}

Writing 6:
Output_buffering = on;
Implicit_flush=on

Ob_end_clean ();
or Ob_end_flush ();
For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Sleep (1);
}

Writing 7:
Output_buffering = on;
Implicit_flush=on

Ob_end_clean ();
or Ob_end_flush ();
For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Flush ();
Sleep (1);
}

Writing 8:
Output_buffering = Off
Implicit_flush=on

For ($i =0 $i <10; $i + +) {
echo $i. ' <br/> ';
Sleep (1);
}