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get_extension_funcs> <get_current_user
[edit] Last updated: Fri, 25 May 2012

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get_defined_constants

(PHP 4 >= 4.1.0, PHP 5)

get_defined_constantsDevuelve un array asociativo con los nombres de todas las constantes y sus valores

Descripción

array get_defined_constants ([ bool $categorize = false ] )

Devuelve los nombres y valores de todas las constantes definidas actualmente. Esto incluye las creadas por las extensiones, así como las creadas con la función define().

Parámetros

categorize

Provoca que la función retorne un array multi-dimensional con categorias en las claves de la primera dimensión y constantes y sus valores en la segunda dimensión.

<?php
define
("MI_CONSTANTE"1);
print_r(get_defined_constants(true));
?>

El resultado del ejemplo sería algo similar a:

Array
(
    [Core] => Array
        (
            [E_ERROR] => 1
            [E_WARNING] => 2
            [E_PARSE] => 4
            [E_NOTICE] => 8
            [E_CORE_ERROR] => 16
            [E_CORE_WARNING] => 32
            [E_COMPILE_ERROR] => 64
            [E_COMPILE_WARNING] => 128
            [E_USER_ERROR] => 256
            [E_USER_WARNING] => 512
            [E_USER_NOTICE] => 1024
            [E_ALL] => 2047
            [TRUE] => 1
        )

    [pcre] => Array
        (
            [PREG_PATTERN_ORDER] => 1
            [PREG_SET_ORDER] => 2
            [PREG_OFFSET_CAPTURE] => 256
            [PREG_SPLIT_NO_EMPTY] => 1
            [PREG_SPLIT_DELIM_CAPTURE] => 2
            [PREG_SPLIT_OFFSET_CAPTURE] => 4
            [PREG_GREP_INVERT] => 1
        )

    [user] => Array
        (
            [MI_CONSTANTE] => 1
        )

)

Valores devueltos

Historial de cambios

Versión Descripción
5.3.1 Sólo para Windows: las constantes fundamentales se clasifican en Core, previamente mhash.
5.3.0 Constantes fundamentales se clasifican en Core, antes interno. En Windows, las constantes fundamentales se clasifican en mhash.
5.2.11 El parámetro categorize ahora funciona correctamente. Anteriormente, el parámetro categorize fue interpretado como !is_null($categorize), por lo que cualquier valor distinto de NULL fuerza a las constantes a ser clasificadas.
5.0.0 El parámetro categorize fue agregado.

Ejemplos

Ejemplo #1 get_defined_constants() Ejemplo

<?php
print_r
(get_defined_constants());
?>

El resultado del ejemplo sería algo similar a:

Array
(
    [E_ERROR] => 1
    [E_WARNING] => 2
    [E_PARSE] => 4
    [E_NOTICE] => 8
    [E_CORE_ERROR] => 16
    [E_CORE_WARNING] => 32
    [E_COMPILE_ERROR] => 64
    [E_COMPILE_WARNING] => 128
    [E_USER_ERROR] => 256
    [E_USER_WARNING] => 512
    [E_USER_NOTICE] => 1024
    [E_ALL] => 2047
    [TRUE] => 1
)

Ver también



get_extension_funcs> <get_current_user
[edit] Last updated: Fri, 25 May 2012
 
add a note add a note User Contributed Notes get_defined_constants
Bob 07-Aug-2008 09:50
Add this method to your class definition if you want an array of class constants (get_defined_constants doesn't work with class constants as Peter P said above):

<?php
public function get_class_constants()
{
   
$reflect = new ReflectionClass(get_class($this));
    return
$reflect->getConstants());
}
?>

You could also override stdObject with it so that all your classes  have this method
eslindsey AT gma il dot co m 13-Aug-2007 01:12
If you need to use the values of your defined constants in strings or for example in HEREDOC syntax, use this function:

<?php

//PHP5+ only
$constarray = get_defined_constants(true);
foreach(
$constarray['user'] as $key => $val)
    eval(
sprintf('$_CONSTANTS[\'%s\'] = \'%s\';', addslashes($key), addslashes($val)));

//PHP4+ ...this is less efficient since it defines hundreds of constants
foreach(get_defined_constants() as $key => $val)
    eval(
sprintf('$_CONSTANTS[\'%s\'] = \'%s\';', addslashes($key), addslashes($val)));

?>

Once you run that you can use $_CONSTANTS['constantname'] to get the value of a constant. You'll need to erase the array and rerun the code if you define any new constants. But I found it handy when I wanted to use a couple of my defined constants in HEREDOC syntax. Don't forget: because this is not really a superglobal you'll need to globalize it if you want to use it from within a different scope, for example:

<?php

//hopefully you ran the snippet out here so that $_CONSTANTS is in global scope.

$mv = $_CONSTANTS['foo']; //works

function my_function()
{
    global
$_CONSTANTS;       //without this line it won't work in here!
   
$mv = $_CONSTANTS['bar']; //works thanks to previous line
}

?>
05-Jan-2006 11:29
If you want to filter through and return only the prefix for your constants (i.e. you have constants with a naming scheme), then you can use this quick little function. It comes in handy for debugging.

<?php
function returnConstants ($prefix) {
    foreach (
get_defined_constants() as $key=>$value)
        if (
substr($key,0,strlen($prefix))==$prefix$dump[$key] = $value;
    if(empty(
$dump)) { return "Error: No Constants found with prefix '".$prefix."'"; }
    else { return
$dump; }
}
?>

Example:

<?php
define
("SITENAME_OPTION_ONE",true);
define("SITENAME_OPTION_TWO",false);
define("SITENAME_URL","foo");

print_r(returnConstants("SITENAME_OPTION"));
?>

Will return:

Array
(
    [SITENAME_OPTIONONE] => 1
    [SITENAME_OPTIONTWO] =>
)
me at gogogadgetscott dot info 18-Jun-2005 11:14
<?php
/**
 * Convert constant value into string name.
 *
 * @param  mixed  Constant value.
 * @return string Constant name.
 * @access public
 */
function sch_get_consant($value)
{
   
$constants = get_defined_constants();
   
$name = array_search($value, $constants, TRUE);   
    return
$name;
}
?>

 
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