function _drupal_get_last_caller in Drupal 7

Gets the last caller from a backtrace.

Parameters

$backtrace: A standard PHP backtrace.

Return value

An associative array with keys 'file', 'line' and 'function'.

5 calls to _drupal_get_last_caller()

DrupalTestCase::errorHandler in modules/simpletest/drupal_web_test_case.php

Handle errors during test runs.

DrupalTestCase::exceptionHandler in modules/simpletest/drupal_web_test_case.php

Handle exceptions.

DrupalTestCase::getAssertionCall in modules/simpletest/drupal_web_test_case.php

Cycles through backtrace until the first non-assertion method is found.

_drupal_decode_exception in includes/errors.inc

Decodes an exception and retrieves the correct caller.

_drupal_error_handler_real in includes/errors.inc

Provides custom PHP error handling.

File

includes/errors.inc, line 266

Functions for error handling.

Code

function _drupal_get_last_caller($backtrace) {

  // Errors that occur inside PHP internal functions do not generate
  // information about file and line. Ignore black listed functions.
  $blacklist = array(
    'debug',
    '_drupal_error_handler',
    '_drupal_exception_handler',
  );
  while ($backtrace && !isset($backtrace[0]['line']) || isset($backtrace[1]['function']) && in_array($backtrace[1]['function'], $blacklist)) {
    array_shift($backtrace);
  }

  // The first trace is the call itself.
  // It gives us the line and the file of the last call.
  $call = $backtrace[0];

  // The second call give us the function where the call originated.
  if (isset($backtrace[1])) {
    if (isset($backtrace[1]['class'])) {
      $call['function'] = $backtrace[1]['class'] . $backtrace[1]['type'] . $backtrace[1]['function'] . '()';
    }
    else {
      $call['function'] = $backtrace[1]['function'] . '()';
    }
  }
  else {
    $call['function'] = 'main()';
  }
  return $call;
}