Description
void 
usleep ( int micro_seconds )
     The usleep() function delays program execution
     for the given number of micro_seconds.  A 
     microsecond is one millionth of a second.
    
     
Example 1. usleep() example 
<?php
  // Current time echo date('h:i:s') . "\n";
  // wait for 2 secondes usleep(2000000);
  // back! echo date('h:i:s') . "\n";
  ?>
 |  
 
       This script will output : 
        | 
    Note: 
      This function did not work on Windows systems until PHP 5.0.0
     
     See also sleep() and 
     set_time_limit().