Edit File: UPGRADING_v5.md
## Upgrading to v5 - Names involving `a, b`, `from, to`, `base, changed` have been renamed to `old, new` for consistency. Here's some examples: - `Diff::setAB()` becomes `Diff::setOldNew()`. - `Diff::setA()` becomes `Diff::setOld()`. - `Diff::setB()` becomes `Diff::setNew()`. - `Diff::getA()` becomes `Diff::getOld()`. - `Diff::getB()` becomes `Diff::getNew()`. - `base`, `changed` keys in the result of the `Json` renderer have become `old`, `new`. - In the result of HTML renderers, classes of rows of line numbers has been changed. You may have to change your CSS if you have some customized things depend on these. - `<th class="f-num">` (from-number) becomes `<th class="n-new">` (number-new). - `<th class="t-num">` (to-number) becomes `<th class="n-old">` (number-old). - The `tag` (sometimes called `op`) in `Json` template is now in `int` form by default. To get previous behavior, set the renderer option `outputTagAsString` to `true`. - The `tag` (sometimes called `op`) in `Diff::getGroupedOpcodes()`'s results are now in `int` form. The corresponding meaning could be found in [jfcherng/php-sequence-matcher](https://github.com/jfcherng/php-sequence-matcher/blob/3.0.0/src/SequenceMatcher.php#L16-L26).
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