lcg-value.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.lcg-value" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>lcg_value</refname>
   <refpurpose>组合线性同余发生器</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  &warn.deprecated.function-8-4-0;
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
   <methodsynopsis>
    <modifier role="attribute">#[\Deprecated]</modifier>
    <type>float</type><methodname>lcg_value</methodname>
    <void/>
   </methodsynopsis>
  <para>
   <function>lcg_value</function> 返回范围为
   (0, 1) 的一个伪随机数。本函数组合了周期为
   2^31 - 85 和 2^31 - 249 的两个同余发生器。本函数的周期等于这两个素数的乘积。
  </para>
  &caution.cryptographically-insecure;
  <caution>
   <para>
    Scaling the return value to a different interval using multiplication
    or addition (a so-called affine transformation) might result in a bias
    in the resulting value as floats are not equally dense across the number
    line. As not all values can be exactly represented by a float, the
    result of the affine transformation might also result in values outside
    of the requested interval.
   </para>
   <para>
    使用 <methodname>Random\Randomizer::getFloat</methodname> 在任意间隔内生成随机浮点数。使用
    <methodname>Random\Randomizer::getInt</methodname> 在任意间隔内生成随机整数。
   </para>
  </caution>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   介于 0.0 和 1.0（含）之间的伪随机浮点值。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.4.0</entry>
      <entry>
       此函数已被弃用。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>Random\Randomizer::getFloat</methodname></member>
    <member><methodname>Random\Randomizer::getInt</methodname></member>
    <member><function>random_int</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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