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 '

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

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

Copy code The code is as follows:

echo '';
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 '

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

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 '

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

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 '

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