How did the user extract data from a log file to plot temperature sensor values on the graph using PHP and JPGraph?

To extract data from a log file to plot temperature sensor values on a graph using PHP and JPGraph, you can read the log file line by line, extract the temperature values, and then use JPGraph to create a graph with the extracted data. 

<?php
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_line.php');

// Read the log file
$logFile = 'temperature.log';
$temperatures = array();

if (($handle = fopen($logFile, 'r')) !== false) {
    while (($data = fgetcsv($handle, 1000, ',')) !== false) {
        $temperatures[] = $data[1]; // Assuming temperature value is in the second column
    }
    fclose($handle);
}

// Create the graph
$graph = new Graph(800, 600);
$graph->SetScale('textlin');
$lineplot = new LinePlot($temperatures);
$graph->Add($lineplot);
$graph->Stroke();
?>

Keywords

log file temperature sensor graph PHP JPGraph

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