mirror of
https://github.com/sigmasternchen/php-doc-en
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323ef98520
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@131848 c90b9560-bf6c-de11-be94-00142212c4b1
66 lines
2 KiB
XML
66 lines
2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<!-- splitted from ./en/functions/strings.xml, last change in rev 1.37 -->
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<refentry id="function.crc32">
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<refnamediv>
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<refname>crc32</refname>
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<refpurpose>Calculates the crc32 polynomial of a string</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>crc32</methodname>
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<methodparam><type>string</type><parameter>str</parameter></methodparam>
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</methodsynopsis>
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<para>
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Generates the cyclic redundancy checksum polynomial of 32-bit
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lengths of the <parameter>str</parameter>. This is usually used
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to validate the integrity of data being transmitted.
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</para>
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<para>
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Because PHP's integer type is signed, and many crc32 checksums will
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result in negative integers, you need to use the "%u" formatter of
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<function>sprintf</function> or <function>printf</function> to get
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the string representation of the unsigned crc32 checksum.
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</para>
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<para>
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This second example shows how to print a converted checksum with the
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<function>printf</function> function:
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<example>
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<title>Displaying a crc32 checksum</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$checksum = crc32("The quick brown fox jumped over the lazy dog.");
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printf("%u\n", $checksum);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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See also <function>md5</function> and <function>sha1</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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