PHP list constants
In this PHP tutorial, we will learn how to list the constants used in our PHP program. And we will show example which prints the all constants defined.
In this PHP tutorial, we will learn how to list the constants used in our PHP program. And we will show example which prints the all constants defined.
- PHP constants defined can be listed using the function get_defined_constants().
- get_defined_constants() returns the system defined and user defined constants in associative array form.
Example of PHP list Constants
<?php
define("g",9.8);
define("PI",31.4);
$cons=get_defined_constants();
echo"<pre>";
foreach ($cons as $key=>$val)
{
echo"<br>$key=>$val ";
}
echo "</pre>";
?>
Output
E_ERROR=>1 E_RECOVERABLE_ERROR=>4096 E_WARNING=>2 E_PARSE=>4 TRUE=>1 FALSE=> NULL=> ZEND_THREAD_SAFE=>1 PHP_VERSION=>5.2.9 PHP_MAJOR_VERSION=>5 PHP_MINOR_VERSION=>2 PHP_RELEASE_VERSION=>9 UPLOAD_ERR_OK=>0 UPLOAD_ERR_INI_SIZE=>1 UPLOAD_ERR_FORM_SIZE=>2 UPLOAD_ERR_PARTIAL=>3 CAL_GREGORIAN=>0 CAL_JULIAN=>1 CAL_JEWISH=>2 CAL_FRENCH=>3 CAL_NUM_CALS=>4 VT_NULL=>1 VT_EMPTY=>0 VT_UI1=>17 VT_I1=>16 VT_UI2=>18 FILTER_FLAG_NONE=>0 FILTER_REQUIRE_SCALAR=>33554432 FILTER_REQUIRE_ARRAY=>16777216 FILTER_FORCE_ARRAY=>67108864 g=>9.8 PI=>31.4
