<?php
 
function abcdefghi_abcdefghi_abcdefghi_abcdefghi_abcdefghi_abcdefghi_() {
	echo __FUNCTION__ . "\n";
}
function abcdefghi_abcdefghi_abcdefghi_abcdefghi_abcdefghi_() {
	echo __FUNCTION__ . "\n";
}
function abcdefghi_abcdefghi_abcdefghi_abcdefghi_() {
	echo __FUNCTION__ . "\n";
}
function abcdefghi_abcdefghi_abcdefghi_() {
	echo __FUNCTION__ . "\n";
}
function abcdefghi_abcdefghi_() {
	echo __FUNCTION__ . "\n";
}
function abcdefghi_() {
	echo __FUNCTION__ . "\n";
}

for ($i=0;$i<6;$i++) {
	$f .= "abcdefghi_";
	$f();
	call_user_func($f);
}