sebastian/csv-parser

Library for type-safe parsing of CSV files

1.0.1 2024-07-03 04:51 UTC

Requires

• php: >=8.3

BSD-3-Clause

• Sebastian Bergmann

README

sebastian/csv-parser

Library for type-safe parsing of CSV files.

Installation

You can add this library as a local, per-project dependency to your project using Composer:

composer require sebastian/csv-parser

If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:

composer require --dev sebastian/csv-parser

Usage

example.csv

1,2,3,1,0,2023-03-24

<?php declare(strict_types=1);
use SebastianBergmann\CsvParser\Parser;
use SebastianBergmann\CsvParser\Schema;
use SebastianBergmann\CsvParser\FieldDefinition;
use SebastianBergmann\CsvParser\Type;
use SebastianBergmann\CsvParser\ObjectMapper;

$schema = Schema::from(
    FieldDefinition::from(1, 'a', Type::integer()),
    FieldDefinition::from(2, 'b', Type::float()),
    FieldDefinition::from(3, 'c', Type::string()),
    FieldDefinition::from(4, 'd', Type::boolean()),
    FieldDefinition::from(5, 'e', Type::boolean()),
    FieldDefinition::from(6, 'f', Type::object(
        new class implements ObjectMapper
        {
            public function map(string $value): DateTimeImmutable
            {
                return new DateTimeImmutable($value);
            }
        }
    )),
);

$parser = new Parser;

foreach ($parser->parse('example.csv', $schema) as $record) {
    var_dump($record);
}

The example above shows how to use a Schema object to configure how a string from a line of comma-separated values is parsed into an array element:

• 1 refers to the position of the string in the line of comma-separated values
• 'a' specifies the key for the value in the associative array that is generated for each record
• Type::integer() specifies the type that should be used to store the value in the associative array that is generated for each record

The following types are available:

• boolean (Type::boolean(); uses (bool) type cast)
• integer (Type::integer(); uses (int) type cast)
• float (Type::float(); uses (float) type cast)
• string (Type::string())
• object (Type::object($mapper); $mapper is an object that implements the SebastianBergmann\CsvParser\ObjectMapper interface)

The Parser::parse() method requires two arguments:

• The first argument, $filename, is the path to the CSV file that should be parsed
• The second argument, $schema, is the Schema object we discussed above

Running the example shown above prints the output shown below:

array(3) {
  ["a"]=>
  int(1)
  ["b"]=>
  float(2)
  ["c"]=>
  string(1) "3"
  ["d"]=>
  bool(true)
  ["e"]=>
  bool(false)
  ["f"]=>
  object(DateTimeImmutable)#1 (3) {
    ["date"]=>
    string(26) "2023-03-24 00:00:00.000000"
    ["timezone_type"]=>
    int(3)
    ["timezone"]=>
    string(13) "Europe/Berlin"
  }
}

The $parser->ignoreFirstLine() method can be used to configure the parser to ignore the first line of the CSV file.

The $parser->setSeparator() method can be used to configure the parser to use a separator different from the default ,.

The $parser->setEnclosure() method can be used to configure the parser to use an enclosure different from the default ".

The $parser->setEscape() method can be used to configure the parser to use an escape different from the default ".