PHP data visualization and report generation in small program development

PHP data visualization and report generation in mini program development

Article introduction:
With the rise of mini programs, more and more developers are beginning to pay attention to the data visualization and reporting of mini programs Generate function. As a commonly used back-end development language, PHP has rich data processing and graphics libraries, which can well meet the needs of data visualization and report generation. This article will introduce how to use PHP to implement data visualization and report generation in mini program development, and attach corresponding code examples.

1. Data visualization

1. Use PHP GD library to generate charts
   PHP GD library is a powerful graphics processing library that can be used to generate various charts, such as line charts , bar chart, pie chart, etc. The following is a sample code to generate a histogram:

<?php
// 创建一个400x300的画布
$image = imagecreatetruecolor(400, 300);

// 设置画布背景颜色为白色
$white = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $white);

// 设置柱状图的数据
$data = array(50, 80, 120, 200, 150);
$colors = array('red', 'green', 'blue', 'yellow', 'orange');

// 计算柱状图的宽度和间距
$barWidth = 40;
$gap = 10;

// 绘制柱状图
foreach ($data as $key => $value) {
    $x1 = $key * ($barWidth + $gap) + 50;
    $y1 = 300 - $value;
    $x2 = $x1 + $barWidth;
    $y2 = 300;
    
    $color = imagecolorallocate($image, hexdec(substr($colors[$key], 0, 2)), hexdec(substr($colors[$key], 2, 2)), hexdec(substr($colors[$key], 4, 2)));
    imagefilledrectangle($image, $x1, $y1, $x2, $y2, $color);
}

// 输出图像
header("Content-type: image/png");
imagepng($image);

// 释放内存
imagedestroy($image);
?>

2. Use PHP Highcharts library to generate charts
   PHP Highcharts is a PHP package library based on the JavaScript Highcharts library, which can be easily used PHP generates various charts. The following is a sample code to generate a line chart:

<?php
require('php_highcharts/Highchart.php');

// 创建一个折线图
$chart = new Highchart();

// 设置图表配置
$chart->chart->renderTo = 'container';
$chart->title->text = '折线图';
$chart->xAxis->categories = array('一月', '二月', '三月', '四月', '五月', '六月');
$chart->yAxis->title->text = '销售量';

// 设置图表数据
$chart->series[] = array('name' => '苹果', 'data' => array(8, 11, 10, 17, 12, 13));
$chart->series[] = array('name' => '香蕉', 'data' => array(7, 8, 6, 10, 9, 11));
$chart->series[] = array('name' => '橙子', 'data' => array(5, 7, 6, 8, 9, 10));

// 输出图表
echo $chart->render();
?>

2. Report generation

1. Use PHP Excel library to generate reports
   PHP Excel is a popular tool for A library for processing Excel files, which can be used to generate reports in various formats. The following is a sample code to generate a simple report:

<?php
require_once 'PHPExcel/PHPExcel.php';

// 创建一个Excel对象
$objPHPExcel = new PHPExcel();

// 设置表格属性
$objPHPExcel->getProperties()->setCreator('小程序开发')->setTitle('报表');

// 设置单元格内容
$objPHPExcel->getActiveSheet()->setCellValue('A1', '姓名');
$objPHPExcel->getActiveSheet()->setCellValue('B1', '年龄');
$objPHPExcel->getActiveSheet()->setCellValue('C1', '性别');

// 填充数据
$data = array(
    array('张三', 25, '男'),
    array('李四', 30, '女'),
    array('王五', 28, '男')
);

foreach ($data as $key => $row) {
    $objPHPExcel->getActiveSheet()->setCellValue('A'.($key+2), $row[0]);
    $objPHPExcel->getActiveSheet()->setCellValue('B'.($key+2), $row[1]);
    $objPHPExcel->getActiveSheet()->setCellValue('C'.($key+2), $row[2]);
}

// 导出Excel文件
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="report.xlsx"');
header('Cache-Control: max-age=0');
$objWriter->save('php://output');
?>

2. Generating reports using the PHP PDF library
   TCPDF is a powerful class library for creating PDF files, which can be used Generate reports in various formats. The following is a sample code to generate a PDF report:

<?php
require_once('tcpdf/tcpdf.php');

// 创建一个PDF对象
$pdf = new TCPDF('P', 'mm', 'A4', true, 'UTF-8', false);

// 设置PDF属性
$pdf->SetCreator('小程序开发');
$pdf->SetAuthor('小程序开发');
$pdf->SetTitle('报表');

// 添加一页
$pdf->AddPage();

// 设置字体
$pdf->SetFont('dejavusans', '', 12);

// 设置表头
$pdf->Cell(30, 7, '姓名', 1, 0, 'C');
$pdf->Cell(30, 7, '年龄', 1, 0, 'C');
$pdf->Cell(30, 7, '性别', 1, 1, 'C');

// 填充数据
$data = array(
    array('张三', 25, '男'),
    array('李四', 30, '女'),
    array('王五', 28, '男')
);

foreach ($data as $row) {
    $pdf->Cell(30, 7, $row[0], 1, 0, 'C');
    $pdf->Cell(30, 7, $row[1], 1, 0, 'C');
    $pdf->Cell(30, 7, $row[2], 1, 1, 'C');
}

// 输出PDF
$pdf->Output('report.pdf', 'I');
?>

Summary:
This article introduces the method of using PHP to realize data visualization and report generation in small program development. Various types of charts can be generated through the PHP GD library and PHP Highcharts library, while the PHP Excel library and PHP PDF library can generate reports in various formats. Developers can choose the appropriate method to implement data visualization and report generation functions based on actual needs, thereby improving the user experience and data analysis capabilities of the mini program.

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