php-Usage of progress bar ob_flush

The

ob_flush()

and
1. flush() functions in php can immediately refresh the current cache to the browser, and use this to make a progress bar.
2. During use, please pay attention to a few points:
   2.1 Calling sequence.
   2.2 Many servers have output cache, PHP itself also has it, and some browsers also have it. It is usually 4096, and some spaces can be written in advance.
   The code is as follows:

<code><span>for</span>( <span>$i</span> = <span>0</span> ; <span>$i</span> < <span>5</span> ; <span>$i</span>++ )
                {
                    <span>echo</span>  str_pad(<span>''</span>,<span>4096</span>);
                    <span>echo</span><span>$i</span> . <span>'<br />'; 
                    ob_flush(); 
                    flush();  
                    sleep(<span>1</span>);
                }   </code>

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The above introduces the use of php-progress bar ob_flush, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.