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

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  <refentry id="function.max">
   <refnamediv>
    <refname>max</refname>
    <refpurpose>Find highest value</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>mixed</type><methodname>max</methodname>
      <methodparam><type>mixed</type><parameter>arg1</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>arg2</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>argn</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>max</function> returns the numerically highest of the
     parameter values.
    </para>
    <para>
     If the first parameter is an array, <function>max</function>
     returns the highest value in that array.  If the first parameter
     is an integer, string or float, you need at least two parameters
     and <function>max</function> returns the biggest of these values.
     You can compare an unlimited number of values.
    </para>
    <para>
     If one or more of the values is a float, all the values will be
     treated as floats, and a float is returned.  If none of the
     values is a float, all of them will be treated as integers, and
     an integer is returned.
    </para>
   </refsect1>
  </refentry>

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