diffbench.php

#!/usr/bin/php
<?php
/**
 * Copyright (c) 2012 File Factory
 * @author Daniel Haas <daniel@file-factory.de>
 */
 

/**
 * Checks if there is a diff between $_file and $_otherFile.
 * Returns true if there is a diff, false otherwise.
 *
 * First checks on filesize, then uses file_get_contents to compare files.
 *
 */
function diff_php_basic($_file,$_otherFile)
{
    if (filesize($_file)!=filesize($_otherFile)) return true;
    else if (file_get_contents($_file)!=file_get_contents($_otherFile)) return true;
    else return false;
}

/**
 * Checks if there is a diff between $_file and $_otherFile.
 * Returns true if there is a diff, false otherwise.
 *
 * First checks on filesize, then uses md5_file to compare files.
 *
 */

function diff_php_md5($_file,$_otherFile)
{
    if (filesize($_file)!=filesize($_otherFile)) return true;
    else if (md5_file($_file)!=md5_file($_otherFile)) return true;
    else return false;

}

/**
 * Checks if there is a diff between $_file and $_otherFile.
 * Returns true if there is a diff, false otherwise.
 *
 * Uses the external diff commandline utility and calls it with backtick operator.
 *
 */
function diff_external_diff_backtick($_file,$_otherFile)
{
    $diffOutput=`diff "$_file" "$_otherFile"`;
    if ($diffOutput) return true;
    else return false;
}

/**
 * Checks if there is a diff between $_file and $_otherFile.
 * Returns true if there is a diff, false otherwise.
 *
 * Uses the external diff commandline utility and calls it with exec()
 *
 */
function diff_external_diff_exec($_file,$_otherFile)
{
    $output=array();
    exec("diff \"$_file\" \"$_otherFile\"",$output);
    $diffOutput=implode("",$output);
    if ($diffOutput) return true;
    else return false;
}


/**
 * Calculates the differences between the two directories.
 * Returns an array of files-names that differs.
 *
 * @param string $_directory The first directory
 * @param string $_otherDirectory The second directory
 * @param string $_diffMethod The diff method to use
 * @return array Array with diffs
 */
function diff_directories($_directory,$_otherDirectory,$_diffMethod)
{
    $diffs=array();

    $objects = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($_directory), RecursiveIteratorIterator::SELF_FIRST);
    foreach($objects as $name => $object){
        if ($object->isFile())
        {
            //echo "$name\n";
            $otherFile=str_replace($_directory,$_otherDirectory,$name);
            //echo "$otherFile\n";
            if ($_diffMethod($name,$otherFile)) $diffs[]=$name;
        }
    }
    return $diffs;
}




if ($argc<3) die("You must pass the path to two directories which are roughly the same.");

//diff_php_basic consumes max_filesize*2 amount of memory, so is disabled by default
$differs=array("diff_php_md5","diff_external_diff_backtick","diff_external_diff_exec");

foreach ($differs as $differ)
{
    echo "Benching $differ:\n";
    $start=microtime(true);
    $diffs=diff_directories($argv[1],$argv[2],$differ);
    $end=microtime(true);

    $timeTaken=round($end-$start,3);
    echo "-> Found ".count($diffs)." differences, took $timeTaken seconds time.\n\n";
}