PHP操作大文件

$file = new SplFileInfo('foo-bar.txt');
 
print_r(array(
    'getATime' => $file->getATime(), //最后访问时间
    'getBasename' => $file->getBasename(), //获取无路径的basename
    'getCTime' => $file->getCTime(), //获取inode修改时间
    'getExtension' => $file->getExtension(), //文件扩展名
    'getFilename' => $file->getFilename(), //获取文件名
    'getGroup' => $file->getGroup(), //获取文件组
    'getInode' => $file->getInode(), //获取文件inode
    'getLinkTarget' => $file->getLinkTarget(), //获取文件链接目标文件
    'getMTime' => $file->getMTime(), //获取最后修改时间
    'getOwner' => $file->getOwner(), //文件拥有者
    'getPath' => $file->getPath(), //不带文件名的文件路径
    'getPathInfo' => $file->getPathInfo(), //上级路径的SplFileInfo对象
    'getPathname' => $file->getPathname(), //全路径
    'getPerms' => $file->getPerms(), //文件权限
    'getRealPath' => $file->getRealPath(), //文件绝对路径
    'getSize' => $file->getSize(),//文件大小，单位字节
    'getType' => $file->getType(),//文件类型 file  dir  link
    'isDir' => $file->isDir(), //是否是目录
    'isFile' => $file->isFile(), //是否是文件
    'isLink' => $file->isLink(), //是否是快捷链接
    'isExecutable' => $file->isExecutable(), //是否可执行
    'isReadable' => $file->isReadable(), //是否可读
    'isWritable' => $file->isWritable(), //是否可写
));

遍历：
try {
    foreach(new SplFileObject('foo-bar.txt') as $line) {
        echo $line;
    }
} catch (Exception $e) {
    echo $e->getMessage();
}

读取制定行：
try {
    $file = new SplFileObject('foo-bar.txt');
    $file->seek(2);
    echo $file->current();
} catch (Exception $e) {
    echo $e->getMessage();
}

写入CSV文件：
$list  = array (
    array( 'aaa' ,  'bbb' ,  'ccc' ,  'dddd' ),
    array( '123' ,  '456' ,  '7891' ),
    array( '"aaa"' ,  '"bbb"' )
);
 
$file  = new  SplFileObject ( 'file.csv' ,  'w' );
 
foreach ( $list  as  $fields ) {
    $file -> fputcsv ( $fields );
}

获取CSV的行数
$csv_file = 'path/bigfile.csv';
$spl_object = new SplFileObject($csv_file, 'rb');
$spl_object->seek(filesize($csv_file));
echo $spl_object->key();

CSV大文件快速定位
$csv_file = 'path/bigfile.csv';
$start = 100000;  // 从第100000行开始读取
$num = 100;    // 读取100行
$data = array();
$spl_object = new SplFileObject($csv_file, 'rb');
$spl_object->seek($start);
while ($num-- && !$spl_object->eof()) {
 $data[] = $spl_object->fgetcsv();
 $spl_object->next();
}
print_r($data);