$name | $date ¤$time_diff edit admin |
\n";
foreach ($fields as $fn ) {
// Diff only if there are differences, obviously
if ($entry["prev_$fn"] !== $entry["crnt_$fn"]) {
$diff = htmlDiff($entry["prev_$fn"], $entry["crnt_$fn"]);
print "$fn | $diff |
\n";
}
}
print "\n";
}
// page footer
include("template/bottom.php");
?>
May be used and distributed under the zlib/libpng license.
This code is intended for learning purposes; it was written with short
code taking priority over performance. It could be used in a practical
application, but there are a few ways it could be optimized.
Given two arrays, the function diff will return an array of the changes.
I won't describe the format of the array, but it will be obvious
if you use print_r() on the result of a diff on some test data.
htmlDiff is a wrapper for the diff command, it takes two strings and
returns the differences in HTML. The tags used are and ,
which can easily be styled with CSS.
*/
function diff($old, $new){
$matrix = array();
$maxlen = 0;
foreach($old as $oindex => $ovalue){
$nkeys = array_keys($new, $ovalue);
foreach($nkeys as $nindex){
$matrix[$oindex][$nindex] = isset($matrix[$oindex - 1][$nindex - 1]) ?
$matrix[$oindex - 1][$nindex - 1] + 1 : 1;
if($matrix[$oindex][$nindex] > $maxlen){
$maxlen = $matrix[$oindex][$nindex];
$omax = $oindex + 1 - $maxlen;
$nmax = $nindex + 1 - $maxlen;
}
}
}
if($maxlen == 0) return array(array('d'=>$old, 'i'=>$new));
return array_merge(
diff(array_slice($old, 0, $omax), array_slice($new, 0, $nmax)),
array_slice($new, $nmax, $maxlen),
diff(array_slice($old, $omax + $maxlen), array_slice($new, $nmax + $maxlen)));
}
function htmlDiff($old, $new){
$ret = '';
$diff = diff(preg_split("/[\s]+/", $old), preg_split("/[\s]+/", $new));
foreach($diff as $k){
if(is_array($k))
$ret .=
(!empty($k['d']) ? "" . input::html(implode(' ',$k['d'])) . " " : '').
(!empty($k['i']) ? "" . input::html(implode(' ',$k['i'])) . " " : '');
else $ret .= $k . ' ';
}
return $ret;
}
?>