php-doc-en/reference/array/functions/array-sum.xml

<?xml version="1.0" encoding="iso-8859-2"?>
<!-- $Revision: 1.3 $ -->
<!-- splitted from ./en/functions/array.xml, last change in rev 1.59 -->
  <refentry id="function.array-sum">
   <refnamediv>
    <refname>array_sum</refname>
    <refpurpose>
     Calculate the sum of values in an array.
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>mixed</type><methodname>array_sum</methodname>
      <methodparam><type>array</type><parameter>array</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>array_sum</function> returns the sum of values
     in an array as an integer or float.
    </para>
    <para>
     <example>
      <title><function>array_sum</function> examples</title>
      <programlisting role="php">
<![CDATA[
$a = array(2, 4, 6, 8);
echo "sum(a) = ".array_sum($a)."\n";

$b = array("a"=>1.2,"b"=>2.3,"c"=>3.4);
echo "sum(b) = ".array_sum($b)."\n";
]]>
      </programlisting>
      <para>
       The printout of the program above will be:
       <screen role="php">
<![CDATA[
sum(a) = 20
sum(b) = 6.9
]]>
       </screen>
      </para>
     </example>
    </para>
    <note>
     <para>
      PHP versions prior to 4.0.6 modified the passed array
      itself and converted strings to numbers (which most
      of the time converted them to zero, depending on
      their value).
     </para>
    </note>
   </refsect1>
  </refentry>

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