strstr() function returns the remainder of string beginning at the first occurrence.

 
Its syntax is: string strstr (string string, string occurrence)

<?
$url = "http://www.java2s.com";
$domain = strstr($url, ".");
print $domain;
?>

1.	string strstr ( string haystack, string needle ) finds the first occurrence of a substring inside another string (parameter one)
2.	strstr function demo
3.	strstr.php
4.	strtr() function converts all characters contained in destination to their corresponding character matches in source.
5.	strtr.php

strstr() function returns the remainder of string beginning at the first occurrence. : strstr « String « PHP