SplFileObject 类

(PHP 5 >= 5.1.0, PHP 7, PHP 8)


SplFileObject 类为文件提供了一个面向对象接口。


class SplFileObject extends SplFileInfo implements RecursiveIterator, SeekableIterator {
/* 常量 */
public const int DROP_NEW_LINE;
public const int READ_AHEAD;
public const int SKIP_EMPTY;
public const int READ_CSV;
/* 方法 */
public __construct(
    string $filename,
    string $mode = "r",
    bool $useIncludePath = false,
    ?resource $context = null
public eof(): bool
public fflush(): bool
public fgetc(): string|false
public fgetcsv(string $separator = ",", string $enclosure = "\"", string $escape = "\\"): array|false
public fgets(): string
public fgetss(string $allowable_tags = ?): string
public flock(int $operation, int &$wouldBlock = null): bool
public fpassthru(): int
public fputcsv(
    array $fields,
    string $separator = ",",
    string $enclosure = "\"",
    string $escape = "\\",
    string $eol = "\n"
): int|false
public fread(int $length): string|false
public fscanf(string $format, mixed &...$vars): array|int|null
public fseek(int $offset, int $whence = SEEK_SET): int
public fstat(): array
public ftell(): int|false
public ftruncate(int $size): bool
public fwrite(string $data, int $length = 0): int|false
public getChildren(): null
public getFlags(): int
public getMaxLineLen(): int
public hasChildren(): false
public key(): int
public next(): void
public rewind(): void
public seek(int $line): void
public setCsvControl(string $separator = ",", string $enclosure = "\"", string $escape = "\\"): void
public setFlags(int $flags): void
public setMaxLineLen(int $maxLength): void
public __toString(): string
public valid(): bool
/* 继承的方法 */
public SplFileInfo::getBasename(string $suffix = ""): string
public SplFileInfo::openFile(string $mode = "r", bool $useIncludePath = false, ?resource $context = null): SplFileObject
public SplFileInfo::setFileClass(string $class = SplFileObject::class): void
public SplFileInfo::setInfoClass(string $class = SplFileInfo::class): void





使用 rewind 或 next 方法时,从文件中读取一行数据。


跳过文件中的空白行。这需要启用 READ_AHEAD 标志,以达到预期的效果。


以 CSV 行的形式读取。


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User Contributed Notes 4 notes

Lars Gyrup Brink Nielsen
10 years ago
Note that this class has a private (and thus, not documented) property that holds the file pointer. Combine this with the fact that there is no method to close the file handle, and you get into situations where you are not able to delete the file with unlink(), etc., because an SplFileObject still has a handle open.

To get around this issue, delete the SplFileObject like this:

print "Declaring file object\n";
$file = new SplFileObject('example.txt');

"Trying to delete file...\n";

"Closing file object\n";
$file = null;

"Deleting file...\n";

'File deleted!';

which will output:

Declaring file object
Trying to delete file...

Warning: unlink(example.txt): Permission denied in file.php on line 6
Closing file object
Deleting file...
File deleted!
marcus at synchromedia dot co dot uk
9 years ago
If you want to skip blank lines when reading a CSV file, you need *all * the flags:

$file->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY | SplFileObject::DROP_NEW_LINE);
contact at trimal dot in
2 months ago
with php 8.3, with or without SplFileObject::DROP_NEW_LINE, you get an array with empty values at the end.
rlazarotto15+dont+spam+me at gmail dot com
3 years ago
Complimenting marcus at synchromedia dot co dot uk comment, you can also do something like this:


// create a SplFileObject for reading - note that there are no flags
$file = new SplFileObject('/path/to/file', 'r');

// iterate over its contents
while (!$file->eof()) {
// get the current line
$line = $file->fgets();

// trim it, and then check if its empty
if (empty(trim($line))) {
// skips the current iteration

this may seem like a overkill for such thing, it allows you to do some processing with the empty lines that might come (I had to do this mostly because I needed to count empty lines instead of just skipping them). Since it also trims the line before checking if it's empty, you won't get lines composed only of empty spaces (I don't know if the flags also make it trim the content before checking it).
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