Description
string 
strstr ( string haystack, string needle )
     Returns part of haystack string from the
     first occurrence of needle to the end of
     haystack.
    
     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.
    
Note: 
      This function is case-sensitive. For case-insensitive searches, use
      stristr().
     
     
Example 1. strstr() example 
<?php $email = 'user@example.com'; $domain = strstr($email, '@'); echo $domain; // prints @example.com ?>
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Note: 
       If you only want to determine if a particular needle
       occurs within haystack, use the faster and less memory
       intensive function strpos() instead.
      
 
    
     strstr() has been binary safe since PHP 4.3.0
    
     See also ereg(), preg_match(),
     stristr(), strpos(),
     strrchr(), and substr().