19c03-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 68 行

<?php
// Declare a global array that we will be using to store this data
$_timer_results = array();

// A function that will add a new timing result to the global
function _timer() {
	global $_timer_results;
	
	// Immediately grab the time in microseconds
	$curtime = microtime(true);
	
	// Grab a backtrace so we can see who called this:
	$trace = debug_backtrace();

	// Now, the [0] entry refers to 'right now' in the backtrace, so we will
	// use that to determine the filename and line #.  But will look
	// at the [1] entry if it exists, for the calling function name.
	$_timer_results[] = array(
		'line' => $trace[0]['line'],
		'file' => $trace[0]['file'],
		'func' => isset($trace[1]['function']) ? $trace[1]['function'] : '',
		'time' => $curtime
		);
}

// Now immediately call timer once, to always place a timer at the entry
// point of our script for us:
_timer();

// Now create a function that will turn these results into a readable text
// string.  It will return this so that it can be dealt with as the program
// needs, either via displaying, adding as an HTML comment, or whatever.
function _timer_text() {
	global $_timer_results;
	$result = 'Timing Results';

	// Start our rolling clock at the timestamp of the first entry
	$clock = @$_timer_results[0]['time'];
	
	// Now, loop through all entries in the timer results to create text
	foreach ($_timer_results as $tr) {
		// Calculate how long this one took, from the rolling clock
		$thistime = $tr['time'] - $clock;
		
		// Reset the clock for the next loop iteration
		$clock = $tr['time'];
		
		// Grab just the filename of the file:
		$fn = basename($tr['file']);
		
		// And to make output prettier, since we don't really need
		// an extreme level of detail on the timing, let's convert
		// the time to use 5 precision points:
		$pretty = number_format($thistime, 5);
		
		// Now make and add the string to the results
		$result .= "\n{$pretty} secs - File: {$fn} - Line: {$tr['line']}";
		
		// If there was a calling function, add it:
		if ($tr['func']) {
			$result .= " - Calling Function: {$tr['func']}";
		}
	}

	// Return what we have created
	return $result;
}
?>