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https://github.com/sigmasternchen/php-doc-en
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5b9fc29465
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78496 c90b9560-bf6c-de11-be94-00142212c4b1
91 lines
2.8 KiB
XML
91 lines
2.8 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<!-- splitted from ./en/functions/strings.xml, last change in rev 1.8 -->
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<refentry id="function.strpos">
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<refnamediv>
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<refname>strpos</refname>
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<refpurpose>
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Find position of first occurrence of a string
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>strpos</methodname>
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<methodparam><type>string</type><parameter>haystack</parameter></methodparam>
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<methodparam><type>string</type><parameter>needle</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>offset</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the numeric position of the first occurrence of
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<parameter>needle</parameter> in the
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<parameter>haystack</parameter> string. Unlike the
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<function>strrpos</function>, this function can take a full
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string as the <parameter>needle</parameter> parameter and the
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entire string will be used.
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</para>
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<para>
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If <parameter>needle</parameter> is not found, returns &false;.
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<note>
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<para>
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It is easy to mistake the return values for "character found at
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position 0" and "character not found". Here's how to detect
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the difference:
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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// in PHP 4.0b3 and newer:
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$pos = strpos($mystring, "b");
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if ($pos === false) { // note: three equal signs
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// not found...
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}
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// in versions older than 4.0b3:
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$pos = strpos($mystring, "b");
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if (!is_integer($pos)) {
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// not found...
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}
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]]>
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</programlisting>
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</informalexample>
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</para>
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</note>
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</para>
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<para>
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If <parameter>needle</parameter> is not a string, it is converted
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to an integer and applied as the ordinal value of a character.
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</para>
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<para>
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The optional <parameter>offset</parameter> parameter allows you
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to specify which character in <parameter>haystack</parameter> to
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start searching. The position returned is still relative to the
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the beginning of <parameter>haystack</parameter>.
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</para>
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<para>
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See also <function>strrpos</function>,
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<function>strrchr</function>, <function>substr</function>,
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<function>stristr</function>, and <function>strstr</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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