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>Variable Functions</TITLE
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><H1
CLASS="title"
>CIII. Variable Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN93658"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="variables.intro"
></A
>Introduction</H1
><P
> For information on how variables behave, see
the <A
HREF="language.variables.html"
>Variables</A
> entry in
the <A
HREF="langref.html"
>Language Reference</A
> section of the manual.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="variables.requirements"
></A
>Requirements</H1
><P
>No external libraries are needed to build this extension.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="variables.installation"
></A
>Installation</H1
><P
>There is no installation needed to use these
functions; they are part of the PHP core.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="var.configuration"
></A
>Runtime Configuration</H1
><P
> The behaviour of these functions is affected by settings in <TT
CLASS="filename"
>php.ini</TT
>.
</P
><P
> <DIV
CLASS="table"
><A
NAME="AEN93675"
></A
><P
><B
>Table 1. Variables Configuration Options</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Name</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Default</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Changeable</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>unserialize_callback_func</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>""</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PHP_INI_ALL</TD
></TR
></TBODY
></TABLE
></DIV
>
For further details and definition of the PHP_INI_* constants see
<A
HREF="function.ini-set.html"
><B
CLASS="function"
>ini_set()</B
></A
>.
</P
><P
> Here is a short explanation of the configuration directives.
<P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><A
NAME="unserialize-callback-func"
></A
><TT
CLASS="parameter"
><I
>unserialize_callback_func</I
></TT
>
<A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></DT
><DD
><P
> The unserialize callback function will called (with the undefind class'
name as parameter), if the unserializer finds an undefined class
which should be instanciated. A warning appears if the specified
function is not defined, or if the function doesn't include/implement
the missing class. So only set this entry, if you really want to
implement such a callback-function.
</P
><P
> See also <A
HREF="function.unserialize.html"
><B
CLASS="function"
>unserialize()</B
></A
>.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="variables.resources"
></A
>Resource Types</H1
><P
>This extension has no resource types defined.</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="variables.constants"
></A
>Predefined Constants</H1
><P
>This extension has no constants defined.</P
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.doubleval.html"
>doubleval</A
> -- Alias of <A
HREF="function.floatval.html"
><B
CLASS="function"
>floatval()</B
></A
></DT
><DT
><A
HREF="function.empty.html"
>empty</A
> -- Determine whether a variable is set</DT
><DT
><A
HREF="function.floatval.html"
>floatval</A
> -- Get float value of a variable</DT
><DT
><A
HREF="function.get-defined-vars.html"
>get_defined_vars</A
> --
Returns an array of all defined variables
</DT
><DT
><A
HREF="function.get-resource-type.html"
>get_resource_type</A
> --
Returns the resource type
</DT
><DT
><A
HREF="function.gettype.html"
>gettype</A
> -- Get the type of a variable</DT
><DT
><A
HREF="function.import-request-variables.html"
>import_request_variables</A
> -- Import GET/POST/Cookie variables into the global scope</DT
><DT
><A
HREF="function.intval.html"
>intval</A
> -- Get integer value of a variable</DT
><DT
><A
HREF="function.is-array.html"
>is_array</A
> -- Finds whether a variable is an array</DT
><DT
><A
HREF="function.is-bool.html"
>is_bool</A
> --
Finds out whether a variable is a boolean
</DT
><DT
><A
HREF="function.is-callable.html"
>is_callable</A
> --
Find out whether the argument is a valid callable construct
</DT
><DT
><A
HREF="function.is-double.html"
>is_double</A
> -- Alias of <A
HREF="function.is-float.html"
><B
CLASS="function"
>is_float()</B
></A
></DT
><DT
><A
HREF="function.is-float.html"
>is_float</A
> -- Finds whether a variable is a float</DT
><DT
><A
HREF="function.is-int.html"
>is_int</A
> -- Find whether a variable is an integer</DT
><DT
><A
HREF="function.is-integer.html"
>is_integer</A
> -- Alias of <A
HREF="function.is-int.html"
><B
CLASS="function"
>is_int()</B
></A
></DT
><DT
><A
HREF="function.is-long.html"
>is_long</A
> -- Alias of <A
HREF="function.is-int.html"
><B
CLASS="function"
>is_int()</B
></A
></DT
><DT
><A
HREF="function.is-null.html"
>is_null</A
> --
Finds whether a variable is <TT
CLASS="constant"
><B
>NULL</B
></TT
>
</DT
><DT
><A
HREF="function.is-numeric.html"
>is_numeric</A
> --
Finds whether a variable is a number or a numeric string
</DT
><DT
><A
HREF="function.is-object.html"
>is_object</A
> -- Finds whether a variable is an object</DT
><DT
><A
HREF="function.is-real.html"
>is_real</A
> -- Alias of <A
HREF="function.is-float.html"
><B
CLASS="function"
>is_float()</B
></A
></DT
><DT
><A
HREF="function.is-resource.html"
>is_resource</A
> --
Finds whether a variable is a resource
</DT
><DT
><A
HREF="function.is-scalar.html"
>is_scalar</A
> --
Finds whether a variable is a scalar
</DT
><DT
><A
HREF="function.is-string.html"
>is_string</A
> -- Finds whether a variable is a string</DT
><DT
><A
HREF="function.isset.html"
>isset</A
> -- Determine whether a variable is set</DT
><DT
><A
HREF="function.print-r.html"
>print_r</A
> --
Prints human-readable information about a variable
</DT
><DT
><A
HREF="function.serialize.html"
>serialize</A
> --
Generates a storable representation of a value
</DT
><DT
><A
HREF="function.settype.html"
>settype</A
> -- Set the type of a variable</DT
><DT
><A
HREF="function.strval.html"
>strval</A
> -- Get string value of a variable</DT
><DT
><A
HREF="function.unserialize.html"
>unserialize</A
> --
Creates a PHP value from a stored representation
</DT
><DT
><A
HREF="function.unset.html"
>unset</A
> -- Unset a given variable</DT
><DT
><A
HREF="function.var-dump.html"
>var_dump</A
> -- Dumps information about a variable</DT
><DT
><A
HREF="function.var-export.html"
>var_export</A
> -- Outputs or returns a string representation of a variable</DT
></DL
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