output buffering in php

outputbuffering.txt

ob_start();
print "Hello First!\n";
ob_end_flush();
ob_start();
print "Hello Second!\n";
ob_end_clean();
ob_start();
print "Hello Third\n";

// reusing buffers 

ob_start();
print "Hello First!\n"
ob_flush();
print "Hello Second!\n";
ob_clean();
print "Hello Third!\n";

//stacking buffer

ob_start();
print "Hello First!\n";
ob_start();
print "Hello Second!\n";
ob_clean();

// flushed stacked buffer

ob_start();
print "In first buffer\n";
ob_start();
print "In second buffer\n";
ob_end_flush();
print "In first buffer\n";
ob_end_flush;
the output will be the following:
In first buffer
In second buffer
In first buffer

ob_start()
print "in first buffer\n";
ob_start();
print "In second buffer\n";
print "In first buffer\n";
ob_end_clean();

// reading buffers 

$result = mysql_query("SELECT * FROM Employeetable WHERE ID = 55;");
while ($row = mysql_fetch_assoc($result)) {
      extract($row);
      print "Some info A: $SomeInforA\n";
      print "Some info B: $SomeInforB\n";
      print "Some info C: $SomeInforC\n";
      //.....[snip]....
      print "Some infor Z: $SomeInfoZ\n";
}

// this code end with data on the screen, if you want it on a file then use this 

ob_start()
$result = mysql_query("SELECT * FROM EmployeeTable WHERE ID = 55;");
while ($row = mysql_fetch_assoc($result)) {
      extract($row);
      print "Some info A: $SomeInforA\n";
      print "Some info B: $SomeInforB\n";
      print "Some info C: $SomeInforC\n";
      //.....[snip]....
      print "Some infor Z: $SomeInfoZ\n";
}
$output = ob_get_contents();
ob_end_clean();
file_put_contents("employee.txt", $output);