Variable handling
I needed a simple function that would reduce any kind of variable to a string or number while retaining some semblance of the data that was stored in the variable. This is what I came up with:
<?
function ReduceVar ($Value) {
switch (gettype($Value)) {
case "boolean":
case "integer":
case "double":
case "string":
case "NULL":
return $Value;
case "resource":
return get_resource_type($Value);
case "object":
return ReduceVar(get_object_vars($Value));
case "array":
if (count($Value) <= 0)
return NULL;
else
return ReduceVar(reset($Value));
default:
return NULL;
}
}
?>
Variable handling Functions
Table of Contents
- debug_zval_dump — Dumps a string representation of an internal zend value to output
- doubleval — Alias of floatval
- empty — Determine whether a variable is empty
- floatval — Get float value of a variable
- get_defined_vars — Returns an array of all defined variables
- get_resource_type — Returns the resource type
- gettype — Get the type of a variable
- import_request_variables — Import GET/POST/Cookie variables into the global scope
- intval — Get the integer value of a variable
- is_array — Finds whether a variable is an array
- is_binary — Finds whether a variable is a native binary string
- is_bool — Finds out whether a variable is a boolean
- is_buffer — Finds whether a variable is a native unicode or binary string
- is_callable — Verify that the contents of a variable can be called as a function
- is_double — Alias of is_float
- is_float — Finds whether the type of a variable is float
- is_int — Find whether the type of a variable is integer
- is_integer — Alias of is_int
- is_long — Alias of is_int
- is_null — Finds whether a variable is NULL
- is_numeric — Finds whether a variable is a number or a numeric string
- is_object — Finds whether a variable is an object
- is_real — Alias of is_float
- is_resource — Finds whether a variable is a resource
- is_scalar — Finds whether a variable is a scalar
- is_string — Find whether the type of a variable is string
- is_unicode — Finds whether a variable is a unicode string
- isset — Determine whether a variable is set
- print_r — Prints human-readable information about a variable
- serialize — Generates a storable representation of a value
- settype — Set the type of a variable
- strval — Get string value of a variable
- unserialize — Creates a PHP value from a stored representation
- unset — Unset a given variable
- var_dump — Dumps information about a variable
- var_export — Outputs or returns a parsable string representation of a variable
add a note
User Contributed NotesVariable handling Functions
jfrasca at sheerdev dot com
31-Aug-2005 07:27
31-Aug-2005 07:27
skelley at diff dot nl
23-Sep-2001 01:55
23-Sep-2001 01:55
Sorry to say Mykolas, but your definition would not be correct.
isempty() evaluates to true for NULL, 0, "", false or 'not set' for any variable, object etc. that can be set to a value.
isset() evaluates to true if the variable, object etc. exists at all, whether it is 'empty' or not.
Example:
$foo = 0;
isset($foo); //will evaluate to true.
!empty($foo); //will evaluate to false.
unset($foo);
isset($foo); //will evaluate to false.
!empty($foo); //will evaluate to false.