PHP怎么实现文件批量分割 文件批量分割操作方法详解

<?php

/**
 * 文件批量分割函数
 *
 * @param string $sourceFile  源文件路径
 * @param string $targetDir   目标目录，存放分割后的文件
 * @param int    $partSize    每个分割文件的大小，单位：字节
 * @param string $prefix      分割文件的前缀名
 * @return bool
 */
function splitFile(string $sourceFile, string $targetDir, int $partSize, string $prefix = 'part_'): bool
{
    if (!is_file($sourceFile)) {
        error_log("Source file not found: " . $sourceFile);
        return false;
    }

    if (!is_dir($targetDir) && !mkdir($targetDir, 0777, true)) {
        error_log("Failed to create target directory: " . $targetDir);
        return false;
    }

    $fileHandle = fopen($sourceFile, 'rb');
    if (!$fileHandle) {
        error_log("Failed to open source file: " . $sourceFile);
        return false;
    }

    $partNumber = 1;
    while (!feof($fileHandle)) {
        $chunk = fread($fileHandle, $partSize);
        if ($chunk === false) {
            error_log("Failed to read from source file: " . $sourceFile);
            fclose($fileHandle);
            return false;
        }

        $targetFile = $targetDir . '/' . $prefix . $partNumber . '.part';
        $targetHandle = fopen($targetFile, 'wb');
        if (!$targetHandle) {
            error_log("Failed to open target file: " . $targetFile);
            fclose($fileHandle);
            return false;
        }

        if (fwrite($targetHandle, $chunk) === false) {
            error_log("Failed to write to target file: " . $targetFile);
            fclose($fileHandle);
            fclose($targetHandle);
            return false;
        }

        fclose($targetHandle);
        $partNumber++;
    }

    fclose($fileHandle);
    return true;
}

// 示例用法
$sourceFile = '/path/to/your/large_file.txt';
$targetDir = '/path/to/your/output_directory';
$partSize = 1024 * 1024 * 10; // 10MB
$prefix = 'my_file_';

if (splitFile($sourceFile, $targetDir, $partSize, $prefix)) {
    echo "File split successfully!";
} else {
    echo "File split failed.";
}

?>

<?php

/**
 * 合并文件函数
 *
 * @param array  $sourceFiles  分割后的文件路径数组，按顺序排列
 * @param string $targetFile   合并后的目标文件路径
 * @return bool
 */
function mergeFiles(array $sourceFiles, string $targetFile): bool
{
    if (empty($sourceFiles)) {
        error_log("No source files provided.");
        return false;
    }

    $targetHandle = fopen($targetFile, 'wb');
    if (!$targetHandle) {
        error_log("Failed to open target file: " . $targetFile);
        return false;
    }

    foreach ($sourceFiles as $sourceFile) {
        if (!is_file($sourceFile)) {
            error_log("Source file not found: " . $sourceFile);
            fclose($targetHandle);
            return false;
        }

        $sourceHandle = fopen($sourceFile, 'rb');
        if (!$sourceHandle) {
            error_log("Failed to open source file: " . $sourceFile);
            fclose($targetHandle);
            return false;
        }

        while (!feof($sourceHandle)) {
            $chunk = fread($sourceHandle, 8192); // 8KB
            if ($chunk === false) {
                error_log("Failed to read from source file: " . $sourceFile);
                fclose($sourceHandle);
                fclose($targetHandle);
                return false;
            }

            if (fwrite($targetHandle, $chunk) === false) {
                error_log("Failed to write to target file: " . $targetFile);
                fclose($sourceHandle);
                fclose($targetHandle);
                return false;
            }
        }

        fclose($sourceHandle);
    }

    fclose($targetHandle);
    return true;
}

// 示例用法
$sourceFiles = [
    '/path/to/your/output_directory/my_file_1.part',
    '/path/to/your/output_directory/my_file_2.part',
    '/path/to/your/output_directory/my_file_3.part',
    // ... 更多分割文件
];
$targetFile = '/path/to/your/merged_file.txt';

if (mergeFiles($sourceFiles, $targetFile)) {
    echo "Files merged successfully!";
} else {
    echo "Files merge failed.";
}

?>

<?php

/**
 * 计算文件MD5值
 *
 * @param string $filePath 文件路径
 * @return string|false
 */
function getFileMd5(string $filePath): string|false
{
    if (!is_file($filePath)) {
        return false;
    }

    return md5_file($filePath);
}

// 示例用法
$filePath = '/path/to/your/large_file.txt';
$md5 = getFileMd5($filePath);

if ($md5 !== false) {
    echo "File MD5: " . $md5;
} else {
    echo "Failed to calculate file MD5.";
}

?>