How to implement trend chart analysis skills in WeChat applet with PHP

With the popularity of WeChat mini programs and the increase in application scenarios, data analysis and visualization tools have become one of the necessary skills for developers. Among them, trend charts are a very common chart type that can visually show the changing trend of data. This article will introduce how to use PHP to implement trend chart analysis techniques in WeChat mini programs.

1. Understand the trend chart

The trend chart is a type of chart used to show the trend of data changes over time. It is usually used to explore long-term trends, periodicity, abnormal changes and other information in data. In WeChat mini programs, trend charts are widely used, such as showing the changing trends of user visits, orders, sales and other data.

2. Use PHP to implement the trend chart

1. Data processing

Before implementing the trend chart, the first step is to process the data. Generally speaking, the original data needs to be normalized and the time converted into a standard time format. In PHP, you can use the DateTime class to handle time formats.

2. Use open source libraries

There are some great open source libraries in PHP that can help us visualize trend charts. For example, PHPlot is a powerful drawing library that supports the creation of many types of charts, including line charts, bar charts, pie charts, etc. In addition, JpGraph is also a very popular drawing library, which supports drawing many types of charts, such as simple line charts, area charts, etc. These libraries are very convenient to use and can help us quickly draw trend charts.

3. Draw a trend chart

Through the above two steps, we can use PHP to draw a trend chart. When using PHPlot to draw a trend chart, you can use the following code:

<?php
require_once '/path/to/phplot.php';

$data = array(
  array('2019-01-01', 42),
  array('2019-01-02', 56),
  array('2019-01-03', 72),
  array('2019-01-04', 60),
  array('2019-01-05', 81),
);

$plot = new PHPlot(800, 600);
$plot->SetImageBorderType('plain');
$plot->SetTitle('My Chart');
$plot->SetDataType('data-data');
$plot->SetDataValues($data);
$plot->SetXTitle('Date');
$plot->SetYTitle('Value');
$plot->SetXTickLabelPos('none');
$plot->SetPlotAreaWorld('2019-01-01', 0, '2019-01-05', 100);
$plot->SetPlotType('linepoints');
$plot->DrawGraph();

This code first defines a set of time series data, then creates a PHPlot object, and sets the relevant attributes of the chart, such as title, Axis type, display data, etc. After the data is processed, the DrawGraph method is finally called to draw the trend graph in the browser.

Of course, if you use JpGraph to draw a trend chart, it is very simple to use:

<?php
require_once '/path/to/jpgraph.php';

$data = array(
  array('2019-01-01', 42),
  array('2019-01-02', 56),
  array('2019-01-03', 72),
  array('2019-01-04', 60),
  array('2019-01-05', 81),
);

$graph = new Graph(800, 600);
$graph->SetScale('datlin');
$graph->SetFrame(false);
$graph->title->Set('My Chart');
$graph->xaxis->SetTitle('Date');
$graph->yaxis->SetTitle('Value');
$graph->img->SetMargin(40, 30, 20, 40);
$graph->img->SetAntiAliasing();
$graph->SetBox(true, 'black', 2);
$lineplot = new LinePlot($data);
$lineplot->SetWeight(2);
$lineplot->SetColor('blue');
$lineplot->mark->SetColor('red');
$lineplot->mark->SetFillColor('red');
$lineplot->mark->SetWidth(6);
$lineplot->mark->SetType(MARK_FILLEDCIRCLE);
$graph->Add($lineplot);
$graph->Stroke();

Similar to PHPlot, this code also defines a time series data and then creates a JpGraph object. And set the relevant properties of the chart, such as title, axis type, display data, etc. After the data is processed, the Stroke method is finally called to draw a trend chart in the browser.

3. Conclusion

With the popularity of WeChat mini programs, trend charts have become one of the indispensable visualization tools for developers. When implementing trend charts, PHP provides many convenient open source libraries, such as PHPlot, JpGraph, etc., which can help us quickly draw trend charts and apply them to WeChat mini programs.

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