mirror of
https://github.com/sigmasternchen/php-doc-en
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d3c871ae1e
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@308253 c90b9560-bf6c-de11-be94-00142212c4b1
144 lines
3.7 KiB
XML
144 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-random-pseudo-bytes">
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<refnamediv>
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<refname>openssl_random_pseudo_bytes</refname>
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<refpurpose>Generate a pseudo-random string of bytes</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>string</type><methodname>openssl_random_pseudo_bytes</methodname>
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<methodparam><type>int</type><parameter>length</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter role="reference">crypto_strong</parameter></methodparam>
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</methodsynopsis>
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<para>
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Generates a <type>string</type> of pseudo-random bytes, with the number of bytes
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determined by the <parameter>length</parameter> parameter.
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</para>
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<para>
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It also indicates if a cryptographically strong algorithm was used to produce the
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pseudo-random bytes, and does this via the optional <parameter>crypto_strong</parameter>
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parameter. It's rare for this to be &false;, but some systems may be broken or old.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>length</parameter></term>
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<listitem>
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<para>
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The length of the desired string of bytes. Must be a positive integer. PHP will
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try to cast this parameter to a non-null integer to use it.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>crypto_strong</parameter></term>
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<listitem>
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<para>
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If passed into the function, this will hold a <type>boolean</type> value that determines
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if the algorithm used was "cryptographically strong", e.g., safe for usage with GPG,
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passwords, etc. &true; if it did, otherwise &false;
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns the generated &string; of bytes on success, &return.falseforfailure;.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>openssl_random_pseudo_bytes</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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for ($i = -1; $i <= 4; $i++) {
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$bytes = openssl_random_pseudo_bytes($i, $cstrong);
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$hex = bin2hex($bytes);
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echo "Lengths: Bytes: $i and Hex: " . strlen($hex) . PHP_EOL;
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var_dump($hex);
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var_dump($cstrong);
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echo PHP_EOL;
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}
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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Lengths: Bytes: -1 and Hex: 0
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string(0) ""
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NULL
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Lengths: Bytes: 0 and Hex: 0
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string(0) ""
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NULL
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Lengths: Bytes: 1 and Hex: 2
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string(2) "42"
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bool(true)
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Lengths: Bytes: 2 and Hex: 4
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string(4) "dc6e"
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bool(true)
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Lengths: Bytes: 3 and Hex: 6
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string(6) "288591"
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bool(true)
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Lengths: Bytes: 4 and Hex: 8
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string(8) "ab86d144"
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bool(true)
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>bin2hex</function></member>
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<member><function>crypt</function></member>
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<member><function>mt_rand</function></member>
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<member><function>uniqid</function></member>
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</simplelist>
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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:"~/.phpdoc/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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