yaml_parse

    (PECL yaml >= 0.4.0)

    yaml_parse — Parse a YAML stream

    Description

    yaml_parse(
        string $input,
        int $pos = 0,
        int &$ndocs = ?,
        array $callbacks = null
    ): mixed

    Convert all or part of a YAML document stream to a PHP variable.

    Parameters

    input

    The string to parse as a YAML document stream.

    pos

    Document to extract from stream (-1 for all documents, 0 for first document, ...).

    ndocs

    If ndocs is provided, then it is filled with the number of documents found in stream.

    callbacks

    Content handlers for YAML nodes. Associative array of YAML tag => callable mappings. See parse callbacks for more details.

    Return Values

    Returns the value encoded in input in appropriate PHP type or false on failure. If pos is -1 an array will be returned with one entry for each document found in the stream.

    Examples

    Example #1 yaml_parse() example

    <?php
    $yaml     = <<<EOD
    ---
    invoice: 34843
    date: "2001-01-23"
    bill-to: &id001
    given: Chris
    family: Dumars
    address:
    lines: |-
    458 Walkman Dr.
    Suite #292
    city: Royal Oak
    state: MI
    postal: 48046
    ship-to: *id001
    product:
    - sku: BL394D
    quantity: 4
    description: Basketball
    price: 450
    - sku: BL4438H
    quantity: 1
    description: Super Hoop
    price: 2392
    tax: 251.420000
    total: 4443.520000
    comments: Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338.
    ...
    EOD;

    $parsed = yaml_parse($yaml);
    var_dump($parsed);
    ?>

    The above example will output something similar to:

    array(8) {
  ["invoice"]=>
  int(34843)
  ["date"]=>
  string(10) "2001-01-23"
  ["bill-to"]=>
  &array(3) {
    ["given"]=>
    string(5) "Chris"
    ["family"]=>
    string(6) "Dumars"
    ["address"]=>
    array(4) {
      ["lines"]=>
      string(34) "458 Walkman Dr.
        Suite #292"
      ["city"]=>
      string(9) "Royal Oak"
      ["state"]=>
      string(2) "MI"
      ["postal"]=>
      int(48046)
    }
  }
  ["ship-to"]=>
  &array(3) {
    ["given"]=>
    string(5) "Chris"
    ["family"]=>
    string(6) "Dumars"
    ["address"]=>
    array(4) {
      ["lines"]=>
      string(34) "458 Walkman Dr.
        Suite #292"
      ["city"]=>
      string(9) "Royal Oak"
      ["state"]=>
      string(2) "MI"
      ["postal"]=>
      int(48046)
    }
  }
  ["product"]=>
  array(2) {
    [0]=>
    array(4) {
      ["sku"]=>
      string(6) "BL394D"
      ["quantity"]=>
      int(4)
      ["description"]=>
      string(10) "Basketball"
      ["price"]=>
      int(450)
    }
    [1]=>
    array(4) {
      ["sku"]=>
      string(7) "BL4438H"
      ["quantity"]=>
      int(1)
      ["description"]=>
      string(10) "Super Hoop"
      ["price"]=>
      int(2392)
    }
  }
  ["tax"]=>
  float(251.42)
  ["total"]=>
  float(4443.52)
  ["comments"]=>
  string(68) "Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338."
}

    Notes

    Warning

    Processing untrusted user input with yaml_parse() is dangerous if the use of unserialize() is enabled for nodes using the !php/object tag. This behavior can be disabled by using the yaml.decode_php ini setting.

    See Also

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    User Contributed Notes 3 notes

    up
    6
    Zalmoksis
    5 years ago
    It seams the YAML standard version here is the 1.1 and not the (1.2 released in 2009), so all of the following values: y, Y, yes, Yes, YES, n, N, no, No, NO, true, True, TRUE, false, False, FALSE, on, On, ON, off, Off, OFF are confusingly at times interpreted as booleans.
    up
    6
    alpacagm at gmail dot com
    12 years ago
    Simple usage example of interpreting custom tags:
    <?php
    $data    =
    "#yaml
    ---
    data: !mytag bar test
    ...
    "    ;

    function     callback($value){
    return     str_replace('bar','baz',$value);
    }
    $cnt;
    $array=yaml_parse($data,0,$cnt,array('!mytag'=>'callback'));

    print_r($array['data']);
    ?>
    output:
    Array
    (
    [data] => baz test
    )
    note, there is a related bug in version 1.0.1 (see tracker)
    up
    1
    laura dot dean at mooneleaf dot com
    8 years ago
    When entering the string through a form, I had to first use utf8_decode on the input before using yaml_parse or else I got a cryptic error message --

    Warning: yaml_parse(): reading error encountered during parsing: control characters are not allowed (line 1, column 1)

    -- even though the special character was buried deep in the file.
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