PHP study notes: data analysis and mining

PHP study notes: data analysis and mining

Data analysis and mining is a popular direction in the current IT field and can play an important role in various industries. As a popular programming language, PHP can also provide support for data analysis and mining through its powerful data processing capabilities. This article will combine specific code examples to introduce how to use PHP for data analysis and mining.

1. Data preparation

Before conducting data analysis and mining, you first need to prepare the data. For data analysis and mining, data sources can be databases, Excel files, CSV files, etc. Suppose we have a CSV file containing student information, here is the data example:

学号,姓名,年龄,性别,成绩
1001,张三,18,男,80
1002,李四,19,女,85
1003,王五,20,男,92
1004,赵六,19,女,78
1005,刘七,18,男,88
...

In PHP, you can use the file reading function file() to read the CSV file as an array , and then use the explode() function to separate each row of data by commas into an array for further processing and analysis.

2. Data statistics and analysis

1. Calculate the average grade

First, we need to calculate the average grade of the students. The following is a sample code:

$students = file('students.csv');

$sum = 0;
$cnt = 0;

foreach ($students as $student) {
    $data = explode(',', $student);
    if (isset($data[4])) {
        $sum += intval($data[4]);
        $cnt++;
    }
}

$average = $sum / $cnt;

echo '平均成绩：' . $average;

2. Analyzing the male-to-female ratio

Next, we can analyze the male-to-female ratio by counting the number of male and female students. The following is a sample code:

$maleCount = 0;
$femaleCount = 0;

foreach ($students as $student) {
    $data = explode(',', $student);
    if (isset($data[3])) {
        if ($data[3] == '男') {
            $maleCount++;
        } elseif ($data[3] == '女') {
            $femaleCount++;
        }
    }
}

echo '男生人数：' . $maleCount;
echo '女生人数：' . $femaleCount;

3. Data Mining and Visualization

On the basis of data analysis, we can also conduct more in-depth data mining to discover the patterns and associations hidden behind the data. . At the same time, using visualization tools to visually display the analysis results helps to better understand and analyze the data.

1. Drawing a grade distribution chart

We can visually display the distribution of students' grades by drawing a grade distribution graph. The following is a sample code:

$grades = []; // 统计各个成绩段人数

foreach ($students as $student) {
    $data = explode(',', $student);
    if (isset($data[4])) {
        $grade = intval($data[4]);
        if (!isset($grades[$grade])) {
            $grades[$grade] = 1;
        } else {
            $grades[$grade]++;
        }
    }
}

// 使用柱状图展示成绩分布
foreach ($grades as $grade => $count) {
    echo $grade . '分: ' . str_repeat('*', $count) . ' (' . $count . '人)' . PHP_EOL;
}

2. Find the students with the top grades

We can find the students with the top grades by comparing their scores. The following is the sample code:

$topStudents = [];

foreach ($students as $student) {
    $data = explode(',', $student);
    $score = isset($data[4]) ? intval($data[4]) : 0;
    $topStudents[$data[1]] = $score;
}

arsort($topStudents);

$i = 1;
foreach ($topStudents as $name => $score) {
    echo '第' . $i . '名: ' . $name . ' (' . $score . '分)' . PHP_EOL;
    $i++;
    if ($i > 10) {
        break;
    }
}

In summary, this article introduces how to use PHP for data analysis and mining through specific code examples. It is hoped that readers can master the application skills of PHP in the field of data analysis and mining through learning and practice, and further improve their abilities in this field.

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