Examples

Many examples exist within the Reflection documentation, typically within the __construct documentation for each class.

Example #1 Reflection Example from Shell (a Terminal)

$ php --rf strlen
$ php --rc finfo
$ php --re json
$ php --ri dom

The above example will output something similar to:

Function [ <internal:Core> function strlen ] {

  - Parameters [1] {
    Parameter #0 [ <required> $str ]
  }
}

Class [ <internal:fileinfo> class finfo ] {

  - Constants [0] {
  }

  - Static properties [0] {
  }

  - Static methods [0] {
  }

  - Properties [0] {
  }

  - Methods [4] {
    Method [ <internal:fileinfo, ctor> public method finfo ] {

      - Parameters [2] {
        Parameter #0 [ <optional> $options ]
        Parameter #1 [ <optional> $arg ]
      }
    }

    Method [ <internal:fileinfo> public method set_flags ] {

      - Parameters [1] {
        Parameter #0 [ <required> $options ]
      }
    }

    Method [ <internal:fileinfo> public method file ] {

      - Parameters [3] {
        Parameter #0 [ <required> $filename ]
        Parameter #1 [ <optional> $options ]
        Parameter #2 [ <optional> $context ]
      }
    }

    Method [ <internal:fileinfo> public method buffer ] {

      - Parameters [3] {
        Parameter #0 [ <required> $string ]
        Parameter #1 [ <optional> $options ]
        Parameter #2 [ <optional> $context ]
      }
    }
  }
}

Extension [ <persistent> extension #23 json version 1.2.1 ] {

  - Constants [10] {
    Constant [ integer JSON_HEX_TAG ] { 1 }
    Constant [ integer JSON_HEX_AMP ] { 2 }
    Constant [ integer JSON_HEX_APOS ] { 4 }
    Constant [ integer JSON_HEX_QUOT ] { 8 }
    Constant [ integer JSON_FORCE_OBJECT ] { 16 }
    Constant [ integer JSON_ERROR_NONE ] { 0 }
    Constant [ integer JSON_ERROR_DEPTH ] { 1 }
    Constant [ integer JSON_ERROR_STATE_MISMATCH ] { 2 }
    Constant [ integer JSON_ERROR_CTRL_CHAR ] { 3 }
    Constant [ integer JSON_ERROR_SYNTAX ] { 4 }
  }

  - Functions {
    Function [ <internal:json> function json_encode ] {

      - Parameters [2] {
        Parameter #0 [ <required> $value ]
        Parameter #1 [ <optional> $options ]
      }
    }
    Function [ <internal:json> function json_decode ] {

      - Parameters [3] {
        Parameter #0 [ <required> $json ]
        Parameter #1 [ <optional> $assoc ]
        Parameter #2 [ <optional> $depth ]
      }
    }
    Function [ <internal:json> function json_last_error ] {

      - Parameters [0] {
      }
    }
  }
}

dom

DOM/XML => enabled
DOM/XML API Version => 20031129
libxml Version => 2.7.3
HTML Support => enabled
XPath Support => enabled
XPointer Support => enabled
Schema Support => enabled
RelaxNG Support => enabled

User Contributed Notes

spectrum at bigmir dot net

5 years ago


Simple table generation using Reflection:

<?php

class A
{
    public    $name = 'Vasiliy';
    public    $text = 'Once upon a time';
}

class B
{
    public    $name = 'Had bought a cat';
    public    $text = 'named Valentine';
}

class grid
{
    public function build(  $dataSource, $headers, $fields  )
    {
        $result = '<table border="1">';
        $result .= $this -> make_head( $headers );
        
        foreach ($dataSource as $source):
            $class_name = get_class($source);
            if ( $class_name != FALSE ):
                $reflector = new ReflectionClass($source);
                echo 'Class "'. $class_name .'" found.<br />';
                $result .= $this -> make_row( $reflector, $fields, $source );
            endif;
        endforeach;
        
        $result .= '</table>';
        return $result;
    }
    
    private function make_head( $headers )
    {
        $result = '<tr>';
        foreach ( $headers as $header):
            $result .= "<th>$header</th>";
        endforeach;
        $result .= '</tr>';
        return $result;
    }
    
    private function make_row( $reflector, $fields, $source )
    {
        $result = '<tr>';
        foreach ( $fields as $field ):
            if ( $reflector -> hasProperty($field) ):
                $property = $reflector -> getProperty($field);
                $result .= '<td>'. $property -> getValue($source) .'</td>';
            endif;
        endforeach;
        $result .= '</tr>';
        return $result;
    }
}

$A = new A;
$B = new B;
$C = 'Test';

$dataSource = array( $A, $B, $C );
$headers = array( 'H1', 'H2' );
$fields = array( 'name', 'text' );

$grid = new grid;
$table = $grid -> build( $dataSource, $headers, $fields );
echo $table;

?>

Kovin

6 years ago


If you want to use method closures and don't have PHP 5.3, perhaps you find useful the following function

<?php

    function get_method_closure($object,$method_name){

        if(method_exists(get_class($object),$method_name)){

            $func            = create_function( '',

                            '

                                $args            = func_get_args();

                                static $object    = NULL;

                                

                                /*

                                * Check if this function is being called to set the static $object, which 

                                * containts scope information to invoke the method

                                */

                                if(is_null($object) && count($args) && get_class($args[0])=="'.get_class($object).'"){

                                    $object = $args[0];

                                    return;

                                }



                                if(!is_null($object)){

                                    return call_user_func_array(array($object,"'.$method_name.'"),$args);

                                }else{

                                    return FALSE;

                                }'

                            );

            

            //Initialize static $object

            $func($object);

            

            //Return closure

            return $func;

        }else{

            return false;

        }        

    }

?>

Here is how you would use it:

<?php

class foo{

    public function bar($foo){

        return strtolower($foo);

    }

}



$foo = new foo();

$f = get_method_closure($foo,'bar');

echo $f("BAR");//Prints 'bar'

?>