Example of PHP outputting all variables/constants/modules/functions/classes of the current process_PHP tutorial

1. get_defined_vars (PHP 4 >= 4.0.4, PHP 5) — Get an array consisting of all defined variables
array get_defined_vars (void)
This function returns an array containing all Multidimensional array of a list of defined variables, including environment variables, server variables, and user-defined variables.

Copy code The code is as follows:

echo '

';
 $b = array(1,1,2,3,5,8);
$arr = get_defined_vars();
// Print $b
print_r($arr["b"]); 
//Print all server variables
print_r($arr["_SERVER"]);
//Print all available key values ​​of the variable array
print_r(array_keys(get_defined_vars()));
?>
2. get_defined_functions (PHP 4 >= 4.0.4, PHP 5) — Get all defined functions
array get_defined_functions (void) //void is expressed as Empty, no parameters are required
echo '
';
function foo()
{
 echo "This is my function foo";
 }
$arr = get_defined_functions();
print_r($arr);
?>

3. get_loaded_extensions (PHP 4, PHP 5 ) — Get all available modules

Copy code The code is as follows:

echo '< pre>';
print_r(get_loaded_extensions());
?>

4. get_extension_funcs (PHP 4, PHP 5) — Get the specified module Available functions
array get_extension_funcs ( string $module_name ) This function returns all available functions of the specified module. The passed-in parameters (module name) must be lowercase

Copy code The code is as follows:

echo '

';
print_r(get_extension_funcs("gd"));
print_r(get_extension_funcs("xml"));
?>

5. get_defined_constants (PHP 4 >= 4.1.0, PHP 5) — Get the names of all constants and their values ​​in an associative array
array get_defined_constants ([ bool $categorize = false ] )

Copy code The code is as follows:

echo '

';
define( "MY_CONSTANT", 1);
print_r(get_defined_constants(true));
?>

6. get_declared_classes (PHP 4, PHP 5) — Get an array consisting of the names of defined classes
array get_declared_classes (void)

Copy code The code is as follows:

echo '

';
//define classone
class classone { }
//define classtwo
class classtwo { }
//This will show 
//...and four
class classfour { }
//Shows the same result as before with class three and four appended
print_r(get_declared_classes());
?> 

http://www.bkjia.com/PHPjc/825077.html

www.bkjia.com

truehttp: //www.bkjia.com/PHPjc/825077.htmlTechArticle1. get_defined_vars (PHP 4 = 4.0.4, PHP 5) — Get a list of all defined variables Array array get_defined_vars (void) This function returns a list containing all defined variables...