How to use PHP functions to process CSV data?

PHP provides convenience functions for reading, writing, parsing, and splicing CSV files, as well as generator functions for processing large CSV files. This article demonstrates how to use these functions to read user data from a CSV file and import it into a database.

Use PHP functions to process CSV data

A CSV (Comma Separated Values) file is a simple text that holds structured data Format. PHP provides a variety of functions for processing and manipulating CSV data quickly and easily.

Read CSV file

$handle = fopen('data.csv', 'r');
while (($row = fgetcsv($handle)) !== FALSE) {
    // 处理每一行数据
}

Write CSV file

$handle = fopen('data.csv', 'w');
fputcsv($handle, ['col1', 'col2', 'col3']);

Parse CSV lines

$row = fgetcsv($handle);
$values = explode(',', $row[0]);

Splicing CSV rows

$row = ['col1', 'col2', 'col3'];
$csvLine = implode(',', $row);

Handling large CSV files

For large CSV files, use the following generator-based functions You can avoid out of memory problems:

$handle = fopen('data.csv', 'r');
$csv = new SplFileObject($handle);
$csv->setFlags(SplFileObject::READ_csv);

foreach ($csv as $row) {
    // 处理每一行数据
}

Practical case: Importing users from a CSV file

Suppose you have a CSV file containing user data, where each row contains users name, email and password. The following PHP code demonstrates how to use PHP functions to import users from a CSV file:

// 打开 CSV 文件
$handle = fopen('users.csv', 'r');

// 忽略标题行
fgetcsv($handle);

// 循环遍历 CSV 文件的其余行
while (($row = fgetcsv($handle)) !== FALSE) {
    // 获取用户信息
    $username = $row[0];
    $email = $row[1];
    $password = $row[2];

    // 创建新用户
    insert_user($username, $email, $password);
}

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