php-diff

A comprehensive library for generating diff between two strings.

Introduction

Generated diff can be rendered in all of the standard formats including:

Text renderers:

Context
Json (plain text)
Unified

HTML renderers:

Combined
Inline
Json (HTML)
Side by Side

Note that for HTML rendered results, you have to add CSS for a better visualization. You may modify one from example/diff-table.css or write your own from zero.

If you are okay with the default CSS, there is \Jfcherng\Diff\DiffHelper::getStyleSheet() which can be used to get the content of the example/diff-table.css.

Requirements

Installation

This package is available on Packagist by the name of jfcherng/php-diff.

composer require jfcherng/php-diff

Example

See files and readme in the example/ directory.

<?php

include __DIR__ . '/vendor/autoload.php';

use Jfcherng\Diff\Differ;
use Jfcherng\Diff\DiffHelper;
use Jfcherng\Diff\Factory\RendererFactory;
use Jfcherng\Diff\Renderer\RendererConstant;

$oldFile = __DIR__ . '/example/old_file.txt';
$newFile = __DIR__ . '/example/new_file.txt';

$old = 'This is the old string.';
$new = 'And this is the new one.';

// renderer class name:
//     Text renderers: Context, JsonText, Unified
//     HTML renderers: Combined, Inline, JsonHtml, SideBySide
$rendererName = 'Unified';

// the Diff class options
$differOptions = [
    // show how many neighbor lines
    // Differ::CONTEXT_ALL can be used to show the whole file
    'context' => 3,
    // ignore case difference
    'ignoreCase' => false,
    // ignore whitespace difference
    'ignoreWhitespace' => false,
];

// the renderer class options
$rendererOptions = [
    // how detailed the rendered HTML in-line diff 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
    '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,
    // 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'],
];

// one-line simply compare two files
$result = DiffHelper::calculateFiles($oldFile, $newFile, $rendererName, $differOptions, $rendererOptions);
// one-line simply compare two strings
$result = DiffHelper::calculate($old, $new, $rendererName, $differOptions, $rendererOptions);
// or even shorter if you are happy with default options
$result = DiffHelper::calculate($old, $new, $rendererName);

// custom usage
$differ = new Differ(explode("\n", $old), explode("\n", $new), $differOptions);
$renderer = RendererFactory::make($rendererName, $rendererOptions); // or your own renderer object
$result = $renderer->render($differ);

// use the JSON result to render in HTML
$jsonResult = DiffHelper::calculate($old, $new, 'Json'); // may store the JSON result in your database
$htmlRenderer = RendererFactory::make('Inline', $rendererOptions);
$result = $htmlRenderer->renderArray(json_decode($jsonResult, true));

Rendered Results

HTML Diff In-line Detailed Rendering

None-level	Line-level (Default)

Word-level	Char-level

Renderer: Inline

<?php $rendererOptions = ['detailLevel' => 'line'];

Renderer: Side By Side

<?php $rendererOptions = ['detailLevel' => 'line'];

Renderer: Combined

<?php $rendererOptions = ['detailLevel' => 'word'];

This renderer is suitable for articles and always has no line number information.

Renderer: Unified

About the Unified diff format: https://en.wikipedia.org/wiki/Diff#Unified_format

@@ -1,3 +1,4 @@
-<p>Hello World!</p>
+<div>Hello World!</div>
 ~~~~~~~~~~~~~~~~~~~
+Let's add a new line here.
 X
@@ -7,6 +8,5 @@
 N
-Do you know in Chinese, "金槍魚罐頭" means tuna can.
+Do you know in Japanese, "魚の缶詰" means fish can.
 This is just a useless line.
 G
-// remember to delete this line
 Say hello to my neighbors.

Renderer: Context

About the Context diff format: https://en.wikipedia.org/wiki/Diff#Context_format

Click to expand

***************
*** 1,3 ****
! <p>Hello World!</p>
  ~~~~~~~~~~~~~~~~~~~
  X
--- 1,4 ----
! <div>Hello World!</div>
  ~~~~~~~~~~~~~~~~~~~
+ Let's add a new line here.
  X
***************
*** 7,12 ****
  N
! Do you know in Chinese, "金槍魚罐頭" means tuna can.
  This is just a useless line.
  G
- // remember to delete this line
  Say hello to my neighbors.
--- 8,12 ----
  N
! Do you know in Japanese, "魚の缶詰" means fish can.
  This is just a useless line.
  G
  Say hello to my neighbors.

Renderer: Text JSON

This renderer has no detailed diff.

Click to expand

[
  [
    {
      "tag": "rep",
      "old": {
        "offset": 0,
        "lines": ["<p>Hello World! Good-looking.</p>"]
      },
      "new": {
        "offset": 0,
        "lines": ["<div>Hello World! Bad-tempered.</div>"]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 1,
        "lines": ["~~~~~~~~~~~~~~~~~~~"]
      },
      "new": {
        "offset": 1,
        "lines": ["~~~~~~~~~~~~~~~~~~~"]
      }
    },
    {
      "tag": "ins",
      "old": {
        "offset": 2,
        "lines": []
      },
      "new": {
        "offset": 2,
        "lines": ["Let's add a new line here."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 2,
        "lines": ["X"]
      },
      "new": {
        "offset": 3,
        "lines": ["X"]
      }
    }
  ],
  [
    {
      "tag": "eq",
      "old": {
        "offset": 6,
        "lines": ["N"]
      },
      "new": {
        "offset": 7,
        "lines": ["N"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 7,
        "lines": ["Do you know in Chinese, \"金槍魚罐頭\" means tuna can."]
      },
      "new": {
        "offset": 8,
        "lines": ["Do you know in Japanese, \"魚の缶詰\" means fish can."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 8,
        "lines": ["\t  \tTab visulization test.", "G"]
      },
      "new": {
        "offset": 9,
        "lines": ["\t  \tTab visulization test.", "G"]
      }
    },
    {
      "tag": "del",
      "old": {
        "offset": 10,
        "lines": ["// remember to delete this line"]
      },
      "new": {
        "offset": 11,
        "lines": []
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 11,
        "lines": ["Say hello to my neighbors."]
      },
      "new": {
        "offset": 11,
        "lines": ["Say hello to my neighbors."]
      }
    }
  ],
  [
    {
      "tag": "eq",
      "old": {
        "offset": 14,
        "lines": ["B"]
      },
      "new": {
        "offset": 14,
        "lines": ["B"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 15,
        "lines": ["Donec rutrum."]
      },
      "new": {
        "offset": 15,
        "lines": ["Donec rutrum test.", "There is a new inserted line."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 16,
        "lines": ["C"]
      },
      "new": {
        "offset": 17,
        "lines": ["C"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 17,
        "lines": ["Sed dictum lorem ipsum."]
      },
      "new": {
        "offset": 18,
        "lines": ["Sed dolor lorem ipsum hendrerit."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 18,
        "lines": [""]
      },
      "new": {
        "offset": 19,
        "lines": [""]
      }
    }
  ]
]

Renderer: HTML JSON

For a "tag": "rep" (8) block, this renderer has HTML-style detailed diff. If you don't need those detailed diff, consider using the JsonText renderer.

Click to expand

[
  [
    {
      "tag": "rep",
      "old": {
        "offset": 0,
        "lines": ["&lt;<del>p&gt;Hello World! Good-looking.&lt;/p</del>&gt;"]
      },
      "new": {
        "offset": 0,
        "lines": ["&lt;<ins>div&gt;Hello World! Bad-tempered.&lt;/div</ins>&gt;"]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 1,
        "lines": ["~~~~~~~~~~~~~~~~~~~"]
      },
      "new": {
        "offset": 1,
        "lines": ["~~~~~~~~~~~~~~~~~~~"]
      }
    },
    {
      "tag": "ins",
      "old": {
        "offset": 2,
        "lines": [""]
      },
      "new": {
        "offset": 2,
        "lines": ["Let's add a new line here."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 2,
        "lines": ["X"]
      },
      "new": {
        "offset": 3,
        "lines": ["X"]
      }
    }
  ],
  [
    {
      "tag": "eq",
      "old": {
        "offset": 6,
        "lines": ["N"]
      },
      "new": {
        "offset": 7,
        "lines": ["N"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 7,
        "lines": ["Do you know in <del>Chinese, \"金槍魚罐頭\" means tuna</del> can."]
      },
      "new": {
        "offset": 8,
        "lines": ["Do you know in <ins>Japanese, \"魚の缶詰\" means fish</ins> can."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 8,
        "lines": ["\t  \tTab visulization test.", "G"]
      },
      "new": {
        "offset": 9,
        "lines": ["\t  \tTab visulization test.", "G"]
      }
    },
    {
      "tag": "del",
      "old": {
        "offset": 10,
        "lines": ["// remember to delete this line"]
      },
      "new": {
        "offset": 11,
        "lines": [""]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 11,
        "lines": ["Say hello to my neighbors."]
      },
      "new": {
        "offset": 11,
        "lines": ["Say hello to my neighbors."]
      }
    }
  ],
  [
    {
      "tag": "eq",
      "old": {
        "offset": 14,
        "lines": ["B"]
      },
      "new": {
        "offset": 14,
        "lines": ["B"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 15,
        "lines": ["Donec rutrum."]
      },
      "new": {
        "offset": 15,
        "lines": ["Donec rutrum test.", "There is a new inserted line."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 16,
        "lines": ["C"]
      },
      "new": {
        "offset": 17,
        "lines": ["C"]
      }
    },
    {
      "tag": "rep",
      "old": {
        "offset": 17,
        "lines": ["Sed d<del>ictum lorem ipsum</del>."]
      },
      "new": {
        "offset": 18,
        "lines": ["Sed d<ins>olor lorem ipsum hendrerit</ins>."]
      }
    },
    {
      "tag": "eq",
      "old": {
        "offset": 18,
        "lines": [""]
      },
      "new": {
        "offset": 19,
        "lines": [""]
      }
    }
  ]
]

Acknowledgment

This package is built on the top of chrisboulton/php-diff initially. But the original repository looks like no longer maintained. Here have been quite lots of rewrites and new features since then, hence I re-started this as a new package for better visibility.

Name		Name	Last commit message	Last commit date
Latest commit History 679 Commits
.github		.github
.phan		.phan
CHANGELOG		CHANGELOG
UPGRADING		UPGRADING
example		example
src		src
tests		tests
.editorconfig		.editorconfig
.gitattributes		.gitattributes
.gitignore		.gitignore
.php-cs-fixer.dist.php		.php-cs-fixer.dist.php
.phpstorm.meta.php		.phpstorm.meta.php
.rmt.yml		.rmt.yml
LICENSE		LICENSE
README.md		README.md
RMT		RMT
composer.json		composer.json
composer.lock		composer.lock
phpcs.xml		phpcs.xml
phpunit.xml		phpunit.xml

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HTML Diff In-line Detailed Rendering

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Introduction

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Example

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HTML Diff In-line Detailed Rendering

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Renderer: Text JSON

Renderer: HTML JSON

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