What Is Haystack And Needle?

[hunglduc]

what is haystack and needle?

[boen_robot]

It's a metaphore... haven't you heared the saying "It's like trying to find a needle in a haystack."?So, when you say for example:

int strpos ( string $haystack , mixed $needle [, int $offset= 0 ] )

The $needle is what you're looking for, and the $haystack is the place where you're looking for it. In this case:

strpos('abcd', 'a');

will search 'abcd' for the string 'a', and since 'a' is the first character in the string, the function call above will return 0.