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HomeBackend DevelopmentPHP TutorialPHP outputs all variables, constants, modules, functions, and classes of the current process

  1. echo '
    '; 
  2. $b = array(1,1,2,3,5,8);
  3. $arr = get_defined_vars();
  4. / / Print $b
  5. print_r($arr["b"]);
  6. // Print all server variables
  7. print_r($arr["_SERVER"]);
  8. // Print all available key values ​​​​of the variable array
  9. print_r (array_keys(get_defined_vars()));
  10. ?>
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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

  1. echo '
    '; 
  2. function foo()
  3. {
  4. echo "This is my function foo";
  5. }
  6. $arr = get_defined_functions();
  7. print_r( $arr);
  8. ?>
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3. get_loaded_extensions (PHP 4, PHP 5) — Get all available modules

  1. echo '
    '; 
  2. print_r(get_loaded_extensions());
  3. (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")); <div class="blockcode">print_r(get_extension_funcs("xml")); <div id="code_mKb">?><ol>
<li> </li>
<li>Copy Code </li>
<li>
<li>
<li>
<li>5. get_defined_constants
</li>
<li> (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 $categorize = false ] )
 </li>
</ol>
</div>
<em onclick="copycode($('code_mKb'));"></em>
</div><p><?php <strong>echo '</p><pre class="brush:php;toolbar:false">';  define("MY_CONSTANT", 1); <div class="blockcode">print_r(get_defined_constants(true)); <div id="code_GCV">?><ol>
<li>
<li>Copy code</li>
<li> </li>
<li> </li>
<li>
<li>6. get_declared_classes
</li>
<li> (PHP 4, PHP 5) — Get an array consisting of the names of defined classes
array get_declared_classes ( void )
 </li>
</ol>
</div>
<em onclick="copycode($('code_GCV'));"></em>
</div><p><?php <strong>echo '</p><pre class="brush:php;toolbar:false">';  //define classone <div class="blockcode">class classone { } <div id="code_S7D"> <ol>//define classtwo <li>class classtwo { } </li>
<li> </li>
<li>//This will show X classes (built-ins, extensions etc) with </li>
<li>//classone and classtwo as the last two elements </li>
<li> </li>
<li>print_r(get_declared_classes()); </li>
<li> </li>
<li>//define classthree </li>
<li>class classthree { } </li>
<li> </li>
<li>//...and four </li>
<li> class classfour { } </li>
<li> </li>
<li>//Shows the same result as before with class three and four appended </li>
<li>print_r(get_declared_classes()); </li>
<li>?> </li>
<li>
<li>
<li>Copy code</li>
<li>
<li>
<li>
<li>
<li>


</li>
</ol>
</div>
<em onclick="copycode($('code_S7D'));">

</em>
</div>
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