yaml_parse_file

(PECL yaml >= 0.4.0)

yaml_parse_file — Parse a YAML stream from a file

说明

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

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

参数

filename

Path to the file.

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.

注释

警告

Processing untrusted user input with yaml_parse_file() 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

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User Contributed Notes 4 notes

up
15
Dan M
2 years ago
Be aware that when parsing yaml an unquoted Y value will become a boolean true

This may be desired or undesired behavior depending on context

- chr_name: X // becomes string X
- chr_name: Y // becomes boolean true

[
[chr_name => X],
[chr_name => true],
]

You definitely don't want chromosome Y becoming chromosome 1 (true) as happened to me, so heads up!
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0
Arne L.
6 years ago
As Jesse Donat mentioned the type will be infered automatically. To enforce some type you can use the callback facility like this:

<?php
function cb_yaml_date($value, $tag, $flags) {
    return new DateTime($value);
}

$yaml = <<<YAML
event1:
  name: My Event
  date: !date 25.05.2001
YAML;

$ndocs = 0;
$data = yaml_parse($yaml, 0, $ndocs, array('!date' => 'cb_yaml_date'));

print_r($data);
?>

The above example will output something similar to:

    Array
    (
        [event1] => Array
            (
                [name] => My Event
                [date] => DateTime Object
                    (
                        [date] => 2001-05-25 00:00:00
                        [timezone_type] => 3
                        [timezone] => Europe/Berlin
                    )
   
            )
   
    )

BTW if you want to have large numbers you are probably using BC Math. Thus, you simple enclose your number in quotes:

<?php
$yaml = <<<YAML
largenumber: '14695760472279668267313200104308'
YAML;
?>
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-3
Jesse Donat
10 years ago
This is entirely dependent on type detection - as far as I can find there is no way to force a type and for instance when you have a very long integer as a value - in my case 1313035348823 it gets limited to 2147483647 - PHP's max integer.
up
-9
DarckCrystale
3 years ago
When trying to read an empty file, yaml_parse_file() throws a warning:

    PHP Warning:  yaml_parse_file(): end of stream reached without finding document 0
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备份地址：http://www.lvesu.com/blog/php/function.yaml-parse-file.php