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+<?php
+
+include __DIR__ . '/../vendor/autoload.php';
+
+use Jfcherng\Diff\Differ;
+use Jfcherng\Diff\Renderer\RendererConstant;
+
+// the two sample files for comparison
+$oldFile = __DIR__ . '/old_file.txt';
+$newFile = __DIR__ . '/new_file.txt';
+$oldString = \file_get_contents($oldFile);
+$newString = \file_get_contents($newFile);
+
+// options for Diff class
+$diffOptions = [
+    // show how many neighbor lines
+    // Differ::CONTEXT_ALL can be used to show the whole file
+    'context' => 1,
+    // ignore case difference
+    'ignoreCase' => false,
+    // ignore line ending difference
+    'ignoreLineEnding' => false,
+    // ignore whitespace difference
+    'ignoreWhitespace' => false,
+    // if the input sequence is too long, it will just gives up (especially for char-level diff)
+    'lengthLimit' => 2000,
+];
+
+// options for renderer class
+$rendererOptions = [
+    // how detailed the rendered HTML is? (none, line, word, char)
+    'detailLevel' => 'line',
+    // renderer language: eng, cht, chs, jpn, ...
+    // or an array which has the same keys with a language file
+    // check the "Custom Language" section in the readme for more advanced usage
+    'language' => 'eng',
+    // show line numbers in HTML renderers
+    'lineNumbers' => true,
+    // show a separator between different diff hunks in HTML renderers
+    'separateBlock' => true,
+    // show the (table) header
+    'showHeader' => true,
+    // convert spaces/tabs into HTML codes like `<span class="ch sp"> </span>`
+    // and the frontend is responsible for rendering them with CSS.
+    // when using this, "spacesToNbsp" should be false and "tabSize" is not respected.
+    'spaceToHtmlTag' => false,
+    // the frontend HTML could use CSS "white-space: pre;" to visualize consecutive whitespaces
+    // but if you want to visualize them in the backend with "&nbsp;", you can set this to true
+    'spacesToNbsp' => false,
+    // HTML renderer tab width (negative = do not convert into spaces)
+    'tabSize' => 4,
+    // this option is currently only for the Combined renderer.
+    // it determines whether a replace-type block should be merged or not
+    // depending on the content changed ratio, which values between 0 and 1.
+    'mergeThreshold' => 0.8,
+    // this option is currently only for the Unified and the Context renderers.
+    // RendererConstant::CLI_COLOR_AUTO = colorize the output if possible (default)
+    // RendererConstant::CLI_COLOR_ENABLE = force to colorize the output
+    // RendererConstant::CLI_COLOR_DISABLE = force not to colorize the output
+    'cliColorization' => RendererConstant::CLI_COLOR_AUTO,
+    // this option is currently only for the Json renderer.
+    // internally, ops (tags) are all int type but this is not good for human reading.
+    // set this to "true" to convert them into string form before outputting.
+    'outputTagAsString' => false,
+    // this option is currently only for the Json renderer.
+    // it controls how the output JSON is formatted.
+    // see available options on https://www.php.net/manual/en/function.json-encode.php
+    'jsonEncodeFlags' => \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE,
+    // this option is currently effective when the "detailLevel" is "word"
+    // characters listed in this array can be used to make diff segments into a whole
+    // for example, making "<del>good</del>-<del>looking</del>" into "<del>good-looking</del>"
+    // this should bring better readability but set this to empty array if you do not want it
+    'wordGlues' => [' ', '-'],
+    // change this value to a string as the returned diff if the two input strings are identical
+    'resultForIdenticals' => null,
+    // extra HTML classes added to the DOM of the diff container
+    'wrapperClasses' => ['diff-wrapper'],
+];