PHP Classes

PHP Plot Graph: Render graph charts of several types as images

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Version License PHP version Categories
php-libplot 1.0.0GNU General Publi...5PHP 5, Graphics, Statistics
Description Author

This class can render graph charts of several types as images.

It can take parameters that define like values, titles, labels and legends to render graph charts that are outputted as HTML to be embedded on a page to display images.

Currently, it supports several types of charts like bar, scatter, plot, lines and custom graphs.

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php-libplot. Written in PHP. Graphs charts, scatter, plot, lines, custom graphs

Matplotlib. Pyplot written in PHP. Graphs charts, scatter, plot, lines, custom graphs


This class starts with the need to create graphics in the style of MatLibPlot, but in pure PHP language due to the use on shared servers with access restrictions to the system to install third-party applications. This first version performs a great variety of the best pyplot functions, combined with mathematical numpy functions commonly used in Machine Learning as linspace or arraypow.

It is based on the same functions already prepared intentionally with a regular use of MatibPlot and also written in PHP That is why it is recommended to also read the documentation of this second class, where most of the methods used by PHP-LibPlot are original provided.


Sample of Pairplot(): PHP-LibPlot. PairPlot Graphs Matlibplot in PHP

Other Samples that you can generate with php-libplot and provided by inside php-graph class: PHP-LibPlot. Graphs Matlibplot in PHP PHP-LibPlot. Graphs Matlibplot in PHP PHP-LibPlot. Graphs Matlibplot in PHP


- Requires php-graph library:

- A minimum (minimum, minimum, minimum requeriments is needed). Tested on:

- Simple Raspberry pi (B +	512MB	700 MHz ARM11) with Raspbian Lite PHP7.3 (i love this gadgets)  :heart_eyes:

- VirtualBox Ubuntu Server 20.04.2 LTS (Focal Fossa) with PHP7.4.3 

- Ubuntu 20.04.3 LTS (Focal Fossa). Laptop Acer Extensa 5630 with PHP 7.4.3 (built: Aug 13 2021 05:39:12) ( NTS )

- Red Hat Enterprise Linux Server release 6.10 (Santiago) PHP Version 7.3.25 (Production Server) 512Mb Memory Limit


- PHP with GD enabled: sudo apt install php-gd

- If you need to use IMG_FILTER_SCATTER you need at least PHP >= PHP7.4.0. See official doc:

- PHP with Imagick for some functions. It is not required for by most methods, but in some, like reading pdf or psd, you will need it. Install: sudo apt install php-imagick

- Requires

# What if I don't have Imagick installed?:

If you do not have Imagick installed and perform some filter that use imagick, the system just won't apply that filter.

# FILES: There are 2 basic files:

php-libplot.class.php -> Master class. This file is the main file that you need to include in your code.

example.php -> example file

# NOTE: In this earlier version, for see the graph, you need to call output_gd_png_base64( ) and draw directly in <img> html object. See example file.

# INSTALLATION: A lot of easy :smiley:. It is written in PURE PHP. Only need to include the files. Tested on basic PHP installation

     require_once( 'php-libplot.class.php' );


      $plt = new php_plotlib();
      $plt->plot( [1, 1.5, 2, 1.8, 3] );
      $plt->plot( [2, 2.8, 1.7, 2, 2.3] );
      $plt->title("Multi Line");
      echo '<img src="'.$plt->output_gd_png_base64( ).'">';


  • CREATE php_plotlib:

$tpl= new php_plotlib( );


You can create subplots inside a plot and manage they individually.

subplots( $numyplots = null, $numxplots = null, $cfg = [ 'bordertype' => 'square', 'figsize' => [6.4, 4.8], 'paddingleft' => .2, 'paddingbottom' => .15 ])

$numyplots: Number of vertical subplots $numxplots: Number of horizontal subplots $cfg: Configuration of subplots: - bordertype: ['square' | 'halfsquare'] - figsize: size in inches (width, height), in inches - paddingleft: If you need space at left, you can to set here in inches - paddingbottom: If you need space at left, you can to set here in inches


    $plt = new php_plotlib();
    $plt->subplots( 2, 2 );
    $plt->subplots[0][0]->bar( [1, 2, 3, 4] );
    $plt->subplots[0][1]->bar( [10, 20, 30, 40] );
    $plt->subplots[1][0]->bar( [100, 200, 300, 400] );
    $plt->subplots[1][1]->bar( [11, 12, 13, 14] );
    echo '<img src="'.$plt->subplots[0][0]->output_gd_png_base64( ).'">';
    echo '<img src="'.$plt->subplots[0][1]->output_gd_png_base64( ).'">';
    echo '<br />';
    echo '<img src="'.$plt->subplots[1][0]->output_gd_png_base64( ).'">';
    echo '<img src="'.$plt->subplots[1][1]->output_gd_png_base64( ).'">';


You can create a pairplot graph from csv dataset in array. First row need to be col names.

In $cfg array you can set the width of the markers: ['widthmarker' => 5]

pairplot( $dataset, $cfg = null )


// read csv

$dataset = [];
if (($gestor = fopen("ibex35.csv", "r")) !== FALSE) {
  	while (($datos = fgetcsv($gestor, 1000, ",")) !== FALSE) {
  			$dataset[] = $datos;

} fclose($gestor);


$plt = new php_plotlib();
$plt->pairplot( $dataset, ['widthmarker' => 6] );?>

<img width="1900" src="<?php echo $plt->output_gd_png_base64( );?>">

IMPORTANT NOTE!!! For other methods read documentation. Example.php file of php-libplot class uses some of the php-graph methods directly (plot, bar, title, ...) as example of use: - bar() - plot() - title() - xlabel() - ylabel() - axes() - legend() - set_drawguidelines() - set_x_drawguidelines(9 - set_y_drawguidelines() - legendwidthlines() - legendlabelheight() - imread() - xticks() - scatter() - hist() - width() - height() - And a common math python funcions created in php as linspace, arraypow and others

Of course. You can use it freely :vulcan_salute::alien:

By Rafa.

@author Rafael Martin Soto

@author {@link Inatica}

@blog {@link Rafael Martin's Blog}

@since OCTOBER 2021

@version 1.0.3

@license GNU General Public License v3.0

  • pairplot.png
  Files folder image Files  
File Role Description
Accessible without login Plain text file example.php Example Example script
Accessible without login Plain text file ibex35.csv Data Auxiliary data
Accessible without login Plain text file LICENSE Lic. License text
Plain text file php-plotlib.class.php Class Class source
Accessible without login Plain text file Doc. Example script

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