Palmtree CSV

A CSV reader and writer for PHP.

The Reader class implements the Iterator interface, loading one line into memory at a time. This means large files can be parsed without hitting any memory limits.

Requirements

• PHP >= 7.4

Installation

Use composer to add the package to your dependencies:

composer require palmtree/csv

Usage

Reading

Reading from a CSV File

$csv = new Reader('people.csv');

foreach($csv as $row) {
    $name = $row['name'];
    if (isset($row['age'])) {
        echo "age is set!";
    }
}

Normalize Data Types

A number of different normalizers can be used to convert data from strings into certain data types. Below is contrived example using some of the currently bundled normalizers:

$csv = new Reader('/path/to/products.csv');

$csv->addNormalizers([
    // Convert to integer
    'product_id' => new NumberNormalizer(),

    // Keep data as string but trim it
    'name' => new StringNormalizer(),

    // Convert to float, rounded to 4 decimal places
    'price' => NumberNormalizer::create()->scale(4),

    // Convert to boolean true or false
    'enabled' => new BooleanNormalizer(),

    // Convert to an array of integers
    'related_product_ids' => new ArrayNormalizer(new NumberNormalizer()),

    // Custom conversion with a callback
    'specials' => new CallableNormalizer(fn ($value) => json_decode($value)),
]);

No Headers

If your CSV contains no headers pass false as the second argument to the constructor:

$csv = new Reader('people.csv', false);

// Alternatively, call the setHasHeaders() method after instantiation:
//$csv->setHasHeaders(false);

Header Offset

If your CSV headers are not on the first row you may specify the (zero based) row offset:

$csv = new Reader('people.csv');
// Headers are on the second row so let's set the offset to 1
$csv->setHeaderOffset(1);

Inline Reading

You may use the InlineReader to parse a CSV string rather than a file, if it was obtained from an API call or some other means:

$csv = new \Palmtree\Csv\InlineReader('"header_1","header_2"' . "\r\n" . '"foo","bar"');

Writing

Build and Download a CSV File

$people   = [];
$people[] = [
    'name'   => 'Alice',
    'age'    => '24',
    'gender' => 'Female',
];
$people[] = [
    'name'   => 'Bob',
    'age'    => '28',
    'gender' => 'Male',
];

Downloader::download('filename.csv', $people);

Writing to a CSV File

$people   = [];
$people[] = [
    'name'   => 'Alice',
    'age'    => '24',
    'gender' => 'Female',
];
$people[] = [
    'name'   => 'Bob',
    'age'    => '28',
    'gender' => 'Male',
];


Writer::write('/path/to/output.csv', $people);

See the examples directory for more usage examples.

Advanced Usage

CSV Control

You can access the document object to change the CSV delimiter, enclosure and escape character:

$csv = new Reader('/path/to/input.csv');

$csv->setDelimiter("\t");
$csv->setEnclosure('"');
$csv->setEscapeCharacter("\\");

Line Endings

CSVs default to \r\n line endings. Access the document object if you need to change this:

$csv = new Writer('/path/to/output.csv');
$csv->getDocument()->setLineEnding("\n");

Fine-grained Control

The document object extends PHP's SplFileObject and inherits its methods:

$csv = new Reader('/path/to/input.csv');
$csv->getDocument()->setFlags(\SplFileObject::DROP_NEW_LINE);

Configuration

If you're trying to read a CSV file in or generated by an old Mac computer you may need to include the following snippet before creating a new Reader instance:

if (!ini_get('auto_detect_line_endings')) {
    ini_set('auto_detect_line_endings', '1');
}

This is because Macs used to use \r as a line separator. See here for more details.

License

Released under the MIT license