Description
string 
stristr ( string haystack, string needle)
     Returns all of haystack from the first
     occurrence of needle to the end.
     needle and haystack
     are examined in a case-insensitive manner.
    
     If needle is not found, returns FALSE.
    
     If needle is not a string, it is converted
     to an integer and applied as the ordinal value of a character.
    
     
例子 1. stristr() example 
<?php   $email = 'USER@EXAMPLE.com';   $domain = stristr($email, 'e');   echo $domain;  // outputs ER@EXAMPLE.com ?>
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     See also strchr(),
     strrchr(), substr(), and
     ereg().