PHP output The current process of all variable constants and other methods introduced

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 for a variable array Print_r (Array_keys (Get_defined_vars ())); Copy Code 2. Get_defined_functions (PHP 4 >= 4.0.4, PHP 5)-Get all the functions that have been defined array get_defined_functions (void)//void is empty, no parameters are required Echo ' '; function foo () { echo "This is my function foo"; } $arr = Get_defined_functions (); Print_r ($arr); Copy Code 3. Get_loaded_extensions (PHP 4, PHP 5)-Get all available modules Echo ' '; Print_r (Get_loaded_extensions ()); Copy Code 4. Get_extension_funcs (PHP 4, PHP 5)-Gets the available functions of the specified module array get_extension_funcs (string $module _name) The function returns all available functions for the specified module. The parameter passed in (module name) must be lowercase Echo ' '; Print_r (Get_extension_funcs ("GD")); Print_r (Get_extension_funcs ("xml")); Copy Code 5. Get_defined_constants (PHP 4 >= 4.1.0, PHP 5)-Gets the name of the associated array all constants and their value array get_defined_constants ([bool $categorize = False]) Echo ' '; Define ("My_constant", 1); Print_r (Get_defined_constants (true)); Copy Code 6. Get_declared_classes (PHP 4, PHP 5)-Gets an array of the names of the defined classes arrays get_declared_classes (void) Echo ' '; Define Classone Class Classone {} Define Classtwo Class Classtwo {} This'll show X classes (built-ins, extensions etc) with Classone and Classtwo as the last of the elements Print_r (Get_declared_classes ()); Define Classthree Class Classthree {} ... and four Class Classfour {} Shows the same result as before with class three and four appended Print_r (Get_declared_classes ()); Copy Code

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