(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
get_defined_constants — Restituisve un array associativo con i nomi di tutte le costanti ed i loro valori
Questa funzione restituisce i nomi ed i valori di tutte le costanti attualmente definite. Queste includono sia quelle create dalle estensioni sia quelle create con la funzione define().
Ad esempio la linea seguente:
<?php
print_r(get_defined_constants());
?>visualizzerà il seguente elenco:
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
)
Vedere anche: defined(), get_loaded_extensions(), get_defined_functions() e get_defined_vars().
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):<?phppublic function get_class_constants(){ $reflect = new ReflectionClass(get_class($this)); return $reflect->getConstants());}?>You could also override stdObject with it so that all your classes have this methodIf you want to access directly on one category, just use:<?phpprint_r(get_defined_constants(true)['Core']);?>you can replace 'Core' by the category you wish (e.g. user):<?phpprint_r(get_defined_constants(true)['user']);?>Warning: only use this on development sideIf you want to filter through and return only the prefix for your constants (i.e. you have constants with a naming scheme), then you can use this quick little function. It comes in handy for debugging.<?phpfunction returnConstants ($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 $dump; }}?>Example:<?phpdefine("SITENAME_OPTION_ONE",true);define("SITENAME_OPTION_TWO",false);define("SITENAME_URL","foo");print_r(returnConstants("SITENAME_OPTION"));?>Will return:Array( [SITENAME_OPTIONONE] => 1 [SITENAME_OPTIONTWO] => )<?php/** * Convert constant value into string name. * * @param mixed Constant value. * @return string Constant name. * @access public */function sch_get_consant($value){ $constants = get_defined_constants(); $name = array_search($value, $constants, TRUE); return $name;}?>