(PECL runkit >= 0.7.0)
runkit_function_add — Add a new function, similar to create_function()
$funcname
   , string $arglist
   , string $code
   )
funcname
     Name of function to be created
arglist
     Comma separated argument list
code
     Code making up the function
   成功时返回 TRUE, 或者在失败时返回 FALSE.
  
Example #1 A runkit_function_add() example
<?php
runkit_function_add('testme','$a,$b','echo "The value of a is $a\n"; echo "The value of b is $b\n";');
testme(1,2);
?>
以上例程会输出:
The value of a is 1 The value of b is 2