This php code snippets generates a backtrace log string of method call stacks along a an inheritance hierarchy. Work in progress.

generate-backtrace-info-for-logging.php

<?php
                ////////////////////////////////
                /// Generate Call Trace Info ///
                ////////////////////////////////
                $backtrace = debug_backtrace(~DEBUG_BACKTRACE_PROVIDE_OBJECT);

                $backtrace_start_index = 1; //index to start reading from in the 
                                            //array returned by debug_backtrace
                $class = "[\n";

                foreach ( $backtrace as $key => $bactrace_data ) {
                    
                    if (
                        array_key_exists('class', $bactrace_data)
                        && $bactrace_data['class'] != __CLASS__
                    ) {
                        $backtrace_start_index = $key;
                        break;
                    }
                }
                
                $num_backtrace_records = count($backtrace);

                while ($backtrace_start_index < $num_backtrace_records) {
                    
                    if(
                        array_key_exists( 'class', $backtrace[$backtrace_start_index + 1] )
                        && is_subclass_of( $backtrace[$backtrace_start_index + 1]['class'], __CLASS__ )
                    ) {
                        $backtrace_start_index++;
                        
                    } else {
                    
                        break;
                    }
                }
                
                $initial_backtrace_start_index = $backtrace_start_index;
                
                while ( $backtrace_start_index > 0 ) {

                    $prev_info_index = $backtrace_start_index -1;
                    $curr_info_index = $backtrace_start_index;
                    
                    $line_being_called_from = 
                        array_key_exists('line', $backtrace[$prev_info_index])? 
                            $backtrace[$prev_info_index]['line'] : 'unknown_line';
                    
                    $file_being_called_from = 
                        array_key_exists('file', $backtrace[$prev_info_index])? 
                            $backtrace[$prev_info_index]['file'] : 'unknown_file';
                
                    if ( $initial_backtrace_start_index === $backtrace_start_index ) {
                    
                        $calling_function = "On line ({$line_being_called_from}) in "
                                          . "\"{$file_being_called_from}\", " 
                                          . $backtrace[$curr_info_index]['class']
                                          . '::'.$backtrace[$curr_info_index]['function']."(...)";
                    } else {

                        $calling_function = $backtrace[$curr_info_index]['class']
                                          . '::'.$backtrace[$curr_info_index]['function']."(...)"
                                          . " which on line ({$line_being_called_from}) in "
                                          . "\"{$file_being_called_from}\" ";
                    }
                    
                    $class .= $calling_function."\t\n called ";                    
                    
                    $backtrace_start_index--;
                }
                
                $class .= __METHOD__."(...)\n]\n";
                
?>