How can PHP be used to read data from a text file and dynamically update a graph's Y-axis values?

To read data from a text file and dynamically update a graph's Y-axis values using PHP, you can use the file() function to read the contents of the text file into an array. Then, you can loop through the array to extract the data you need for the Y-axis values. Finally, you can use this data to dynamically update the graph's Y-axis values. 

<?php
// Read data from text file into an array
$data = file('data.txt');

// Loop through the array to extract Y-axis values
$y_axis_values = [];
foreach ($data as $line) {
    $y_axis_values[] = intval($line); // Assuming each line contains a single integer value
}

// Use the extracted Y-axis values to dynamically update the graph
// Example: Update a line chart's Y-axis values
echo '<script>';
echo 'var yValues = ' . json_encode($y_axis_values) . ';';
echo 'updateChartYAxis(yValues);'; // Call a JavaScript function to update the chart's Y-axis
echo '</script>';
?>

Keywords

PHP text file graph Y-axis dynamic update

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