How Can I Programmatically Access Nested Values within a PHP `print_r()` Output?

Accessing Variables in PHP Print_r() Output

When examining the print_r() output of a variable, it's common to identify the desired value but struggle to retrieve it programmatically.

To access a particular value, identify the expression needed based on the variable's data type. For simple types (strings, integers), simply prefix the variable name with $. However, compound types (arrays, objects) require a combination of $ and accessors (such as ->, [], and array keys).

Consider the following sample provided in the question:

field_image (Object) stdClass
  handler (Object) views_handler_field_field
    view (Object) view
      result (Array, 2 elements)
        0 (Object) stdClass
          _field_data (Array, 1 element)
            nid (Array, 2 elements)
              entity (Object) stdClass
                field_image (Array, 1 element)
                  und (Array, 1 element)
                    0 (Array, 11 elements)
                      filename (String, 23 characters ) FILENAME.jpg

To extract the "FILENAME.jpg" value, construct the following expression:

$field_image->handler->view->result[0]->_field_data['nid']['entity']->field_image['und'][0]['filename']

This expression accesses the nested objects and arrays to reach the desired value.

By combining knowledge of variable types and accessors, developers can retrieve specific values from print_r() output and utilize them within their code.

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