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<HTML
><HEAD
><TITLE
>Types</TITLE
><META
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CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
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>PHP Manual</TH
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><DIV
CLASS="chapter"
><H1
><A
NAME="language.types"
>Chapter 6. Types</A
></H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="language.types.html#language.types.integer"
>Integers</A
></DT
><DT
><A
HREF="language.types.double.html"
>Floating point numbers</A
></DT
><DT
><A
HREF="language.types.string.html"
>Strings</A
></DT
><DT
><A
HREF="language.types.array.html"
>Arrays</A
></DT
><DT
><A
HREF="language.types.object.html"
>Objects</A
></DT
><DT
><A
HREF="language.types.type-juggling.html"
>Type Juggling</A
></DT
></DL
></DIV
><P
>&#13;   PHP supports the following types:
   <P
></P
><UL
><LI
><P
>&#13;      <A
HREF="language.types.array.html"
>array</A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.double.html"
>floating-point numbers
      </A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.html#language.types.integer"
>integer</A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.object.html"
>object</A
>
     </P
></LI
><LI
><P
>&#13;      <A
HREF="language.types.string.html"
>string</A
>
     </P
></LI
></UL
>
  </P
><P
>&#13;   The type of a variable is usually not set by the programmer;
   rather, it is decided at runtime by PHP depending on the context in
   which that variable is used.
  </P
><P
>&#13;   If you would like to force a variable to be converted to a certain
   type, you may either <A
HREF="language.types.type-juggling.html#language.types.typecasting"
>cast</A
> the variable or
   use the <A
HREF="function.settype.html"
><B
CLASS="function"
>settype()</B
></A
> function on it.
  </P
><P
>&#13;   Note that a variable may behave in different manners in certain
   situations, depending on what type it is at the time. For more
   information, see the section on <A
HREF="language.types.type-juggling.html"
>Type Juggling</A
>.
  </P
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="language.types.integer"
>Integers</A
></H1
><P
>&#13;    Integers can be specified using any of the following syntaxes:
    <DIV
CLASS="informalexample"
><A
NAME="AEN2342"
></A
><P
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>&#13;$a = 1234; # decimal number
$a = -123; # a negative number
$a = 0123; # octal number (equivalent to 83 decimal)
$a = 0x12; # hexadecimal number (equivalent to 18 decimal)
     </PRE
></TD
></TR
></TABLE
><P
></P
></DIV
>
    The size of an integer is platform-dependent, although a 
    maximum value of about 2 billion is the usual value 
    (that's 32 bits signed).
   </P
></DIV
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>Comments</TD
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>Up</A
></TD
><TD
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>Floating point numbers</TD
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>