difference between PRINT, printf and echo?

[isuru]

What is the difference between PRINT, printf and echo?

They are all used to print text on the screen but printf function is way more complicated.

echo seems to be the simplest to use why would anyone use printf or PRINT

[JohnM]

print / echo, same thing
printf - print formatted
like this:
printf("You registered on %d. You have earned %m",$dateregistered,$moneyearned);
Not sure if the %m is right, but...

[Jalit]

I use echo but I don't know why. I guess becasue it is shorter.