Created
March 18, 2013 23:54
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Text DIFF with highlighting
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function htmlDiff($old, $new, $exceptions = array()) { | |
$ret = ''; | |
$diff = diff(explode(' ', $old), explode(' ', $new), $exceptions); | |
foreach ($diff as $k) { | |
if (is_array($k)) { | |
$ret .= (!empty($k['d']) ? "<del style='background:#FFFF00;'>" . implode(' ', $k['d']) . "</del> " : '') . (!empty($k['i']) ? "<ins style='background:#00FF00;'>" . implode(' ', $k['i']) . "</ins> " : ''); | |
} | |
else { | |
$ret .= $k . ' '; | |
} | |
} | |
return $ret; | |
} | |
function diff($old, $new, $exceptions = 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]) && in_array($ovalue, $exceptions) ? $matrix[$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))); | |
} |
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