PHP outputs all variables, constants, modules, functions, and classes of the current process-PHP Tutorial-php.cn

PHP outputs all variables, constants, modules, functions, and classes of the current process

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Release： 2016-07-25 09:04:41

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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()));
?>

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2. get_defined_functions (PHP 4 >= 4.0.4, PHP 5) — Get all defined functions array get_defined_functions (void) //void means empty and does not require any parameters

echo '
```
'; 
```
function foo()
{
echo "This is my function foo";
}
$arr = get_defined_functions();
print_r( $arr);
?>

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

echo '
```
'; 
```
print_r(get_loaded_extensions());
(PHP 4, PHP 5) — Get the available functions of the specified module array get_extension_funcs (string $module_name) This function returns all available functions of the specified module. The parameters passed in (module names) must be lowercase

echo '

';  
print_r(get_extension_funcs("gd")); print_r(get_extension_funcs("xml")); ?>
 
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5. get_defined_constants

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




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

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6. get_declared_classes

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




echo '
';  
//define classone class classone { }  //define classtwo class classtwo { } 
 
//This will show X classes (built-ins, extensions etc) with 
//classone and classtwo as the last two 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()); 
?> 


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