php-doc-en/reference/math/reference.xml

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 <reference id="ref.math">
  <title>Mathematical Functions</title>
  <titleabbrev>Math</titleabbrev>
  
  <partintro>
   <section id="math.intro">
    &reftitle.intro;
    <para>
     These math functions will only handle values within the range of
     the <type>integer</type> and <type>float</type> types on your computer
     (this corresponds currently to the C types long resp. double).
     If you need to handle bigger numbers, take a look at the <link
     linkend="ref.bc">arbitrary precision math functions</link>.
    </para>
    <simpara>
     See also the manual page on 
     <link linkend="language.operators.arithmetic">arithmetic
     operators</link>. 
    </simpara>
   </section>

   <section id="math.requirements">
    &reftitle.required;
    &no.requirement;
   </section>
   
   <section id="math.installation">
    &reftitle.install;
    &no.install;
   </section>

   <section id="math.configuration">
    &reftitle.runtime;
    &no.config;
   </section>

   <section id="math.resources">
    &reftitle.resources;
    &no.resource;
   </section>

   &reference.math.constants;

  </partintro>

&reference.math.functions;

 </reference>
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