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PHP-Histogram

1. Features

PHP-Histogram is a PHP Library which is easy to use for creating histograms.

You can create a simple Histogram just by setting class range and data and filepath to save.

Frequency Polygon, Cumulative Frequency Polygon, Cumulative Relative Frequency Polygon and plotting Frequency are supported.

Changing other properties, such as Caption, X Label, Y Label, Various Colors, Canvas Size, Frame Ratio and Various Width are supported.

Transparent background is also supported.

2. Contents

• 1. Freatures
• 2. Contents
• 3. Requirements
• 4. Installation
• 5. Usage
  • 5.1. Basic Usage
  • 5.2. Changing Properties By Methods
  • 5.3. Changing Properties By Neon File
  • 5.4. Changing Properties By Array
  • 5.5. Transparent Background
• 6. Examples
• 7. License

3. Requirements

• PHP 8.3 or later

• Imagick PHP Extension

  Check with commands:

• Mbstring PHP Extension

  Check with commands:

• Composer

4. Installation

5. Usage

5.1. Basic Usage

• PHP: examples/BasicUsage.php

• Result:

• Details:
  • Import autoloader: require_once __DIR__ . '/../vendor/autoload.php'
  • Declare: use Macocci7\PhpHistogram\Histogram
  • Instantiate: new Histogram() or new Histogram($width, $height)
    • $width: canvas width, type of int, must be 50 <= $width, 400px as default.
    • $height: canvas height, type of int, must be 50 <= $height, 300px as default.
  • Set Class Range: setClassRange($classRange)
    • $classRange: type of positive int|float.
  • Set Data: setData($data)
    • $data: type of array<int|string, int|float>
  • Create: create($path2Save)
    • $path2Save: type of string.

5.2. Changing Properties By Methods

You can change properties of Histogram like as follows.

• PHP: examples/ChangePropsByMethods.php

• Result: examples/img/ChangePropsByMethods.png

5.3. Changing Properties By Neon File

You can change properties of Histogram like as follows.

First, create a Neon file.

• Neon File: examples/ChangePropsByNeon.neon

Second, Code PHP as follows.

• PHP: examples/ChangePropsByNeon.php

Then, run the PHP code and view the result.

• Result: examples/img/ChangePropsByNeon.png

5.4. Changing Properties By Array

You can change properties of Histogram like as follows.

• PHP:

• Result: examples/img/ChangePropsByArray.png

5.5. Transparent Background

Setting colors to transparent is supported.

For example,

• PHP: examples/TransparentBackground.php

• Result: examples/img/TransparentBackground.png

  Check if the image has transparent background with HTML:

  examples/TransparentBackground.html

6. Examples

• BasicUsage.php >> results in:

• ChangePropsByMethods.php >> results in:

• ChangePropsByNeon.php >> results in:

• ChangePropsByArray.php >> results in:

• TransparentBackground.php >> results in:

• HistogramExampleCase.md

• OhtaniShoheiHistogram2025-2026.md

7. License

MIT