# yaml_parse

(PECL yaml >= 0.4.0)

yaml_parse — Parse a YAML stream

### 说明

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.

### 参数

`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.

### 返回值

Returns the value encoded in `input` in appropriate PHP type 或者在失败时返回 `FALSE`. If `pos` is -1 an array will be returned with one entry for each document found in the stream.

### 范例

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);
    ?>

以上例程的输出类似于：

    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."
    }

### 注释

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.

### 参见

- yaml_parse_file() - Parse a YAML stream from a file
- yaml_parse_url() - Parse a Yaml stream from a URL
- yaml_emit() - Returns the YAML representation of a value