php-doc-en/reference/strings/functions/strstr.xml

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  <refentry id="function.strstr">
   <refnamediv>
    <refname>strstr</refname>
    <refpurpose>Find first occurrence of a string</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>strstr</methodname>
      <methodparam><type>string</type><parameter>haystack</parameter></methodparam>
      <methodparam><type>string</type><parameter>needle</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns part of <parameter>haystack</parameter> string from the
     first occurrence of <parameter>needle</parameter> to the end of
     <parameter>haystack</parameter>.
    </para>
    <para>
     If <parameter>needle</parameter> is not found, returns &false;.
    </para>
    <para>
     If <parameter>needle</parameter> is not a string, it is converted
     to an integer and applied as the ordinal value of a character.
    </para>
    <note>
     <para>
      This function is case-sensitive. For case-insensitive searches, use
      <function>stristr</function>.
     </para>
    </note>
    <para>
     <example>
      <title><function>strstr</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$email = 'user@example.com';
$domain = strstr($email, '@');
print $domain; // prints @example.com
?>
]]>
      </programlisting>
     </example> 
    </para>
    <para>
     <note>
      <para>
       If you only want to determine if a particular <parameter>needle</parameter>
       occurs within <parameter>haystack</parameter>, use the faster and less memory
       intensive function <function>strpos</function> instead.
      </para>
     </note>
    </para>
    <para>
     See also <function>ereg</function>, <function>preg_match</function>,
     <function>strchr</function>, <function>stristr</function>,
     <function>strpos</function>, <function>strrchr</function>, and
     <function>substr</function>.
    </para>
   </refsect1>
  </refentry>

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