1<?php 2function func_c() 3{ 4 echo "Function C\n"; 5 sleep(1); 6} 7 8function func_b() 9{ 10 echo "Function B\n"; 11 sleep(1); 12 func_c(); 13} 14 15function func_a() 16{ 17 echo "Function A\n"; 18 sleep(1); 19 func_b(); 20} 21 22func_a(); 23?> 24