PHP uses caching to output content immediately (output buffering)

Output every 1 second, implementation ->

1st output.
The 2nd output.
The 3rd output.
The 4th output.
The 5th output.
The 6th output.
The 7th output.
The 8th output.
The 9th output.
10th output.
Output completed!

$buffer = ini_get('output_buffering');
echo str_repeat(' ',$buffer+1); //Prevent browser caching
ob_end_flush(); //Close caching
for( $i=1; $i<=10; $i++ ){
 echo '.$i.'th output.'."n";
 flush(); //Refresh the cache (send directly to the browser )
 sleep(1);
}
echo 'Output completed! ';