Simple human readable stack trace for PHP scripts or Web

stack_trace.php

<?php
/**
 * Print out a stack trace from entry point to wherever this function was called.
 * @param boolean $show_args Show arguments passed to functions? Default False.
 * @param boolean $for_web Format text for web? Default True.
 * @param boolean $return Return result instead of printing it? Default False.
 */
public static function stack_trace($show_args=false, $for_web=true, $return=false){
	if ($for_web){
		$before = '<b>';
		$after = '</b>';
		$tab = '&nbsp;&nbsp;&nbsp;&nbsp;';
		$newline = '<br>';
	}
	else{
		$before = '<';
		$after = '>';
		$tab = "\t";
		$newline = "\n";
	}
	$output = '';
	$ignore_functions = array('include','include_once','require','require_once');
	$backtrace = debug_backtrace();
	$length = count($backtrace);

	for ($i=0; $i<$length; $i++){
		$function = $line = '';
		$skip_args = false;
		$caller = @$backtrace[$i+1]['function'];
		// Display caller function (if not a require or include)
		if(isset($caller) && !in_array($caller, $ignore_functions)){
			$function = ' in function '.$before.$caller.$after;
		}
		else{
			$skip_args = true;
		}
		$line = $before.$backtrace[$i]['file'].$after.$function .' on line: '.$before.$backtrace[$i]['line'].$after.$newline;
		if ($i < $length-1){
			if ($show_args && $backtrace[($i+1)]['args'] && !$skip_args){
				$params = ($for_web) ? htmlentities(print_r($backtrace[($i+1)]['args'], true))
						: print_r($backtrace[($i+1)]['args'], true);
				$line .= $tab.'Called with params: '.preg_replace('/(\n)/',$newline.$tab,trim($params)).$newline.$tab.'By:'.$newline;
				unset($params);
			}
			else{
				$line .= $tab.'Called By:'.$newline;
			}
		}
		if ($return){
			$output .= $line;
		}
		else{
			echo $line;
		}
	}
	if ($return){
		return $output;
	}
}