yaml_emit

(PECL yaml >= 0.5.0)

yaml_emit — Returns the YAML representation of a value

说明

yaml_emit(
    mixed $data,
    int $encoding = YAML_ANY_ENCODING,
    int $linebreak = YAML_ANY_BREAK,
    array $callbacks = null
): string

Generate a YAML representation of the provided data.

参数

data: The data being encoded. Can be any type except a resource.
encoding: Output character encoding chosen from YAML_ANY_ENCODING, YAML_UTF8_ENCODING, YAML_UTF16LE_ENCODING, YAML_UTF16BE_ENCODING.
linebreak: Output linebreak style chosen from YAML_ANY_BREAK, YAML_CR_BREAK, YAML_LN_BREAK, YAML_CRLN_BREAK.
callbacks: Content handlers for emitting YAML nodes. Associative array of classname => callable mappings. See emit callbacks for more details.

返回值

Returns a YAML encoded string on success.

更新日志

版本	说明
PECL yaml 1.1.0	The `callbacks` parameter was added.

示例

示例 #1 yaml_emit() example

<?php
$addr = array(
"given" => "Chris",
"family"=> "Dumars",
"address"=> array(
"lines"=> "458 Walkman Dr.
        Suite #292",
"city"=> "Royal Oak",
"state"=> "MI",
"postal"=> 48046,
      ),
  );
$invoice = array (
"invoice"=> 34843,
"date"=> 980208000,
"bill-to"=> $addr,
"ship-to"=> $addr,
"product"=> array(
        array(
"sku"=> "BL394D",
"quantity"=> 4,
"description"=> "Basketball",
"price"=> 450,
          ),
        array(
"sku"=> "BL4438H",
"quantity"=> 1,
"description"=> "Super Hoop",
"price"=> 2392,
          ),
      ),
"tax"=> 251.42,
"total"=> 4443.52,
"comments"=> "Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338.",
  );
var_dump(yaml_emit($invoice));
?>

以上示例的输出类似于：

string(628) "---
invoice: 34843
date: 980208000
bill-to:
  given: Chris
  family: Dumars
  address:
    lines: |-
      458 Walkman Dr.
              Suite #292
    city: Royal Oak
    state: MI
    postal: 48046
ship-to:
  given: Chris
  family: Dumars
  address:
    lines: |-
      458 Walkman Dr.
              Suite #292
    city: Royal Oak
    state: MI
    postal: 48046
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.
...
"

参见

yaml_emit_file() - Send the YAML representation of a value to a file
yaml_parse() - Parse a YAML stream

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＋添加备注

用户贡献的备注 2 notes

down

josh dot sickmate at gmail dot com ¶

5 years ago

There isn't an option for indenting depth so it's always two spaces. If you want more than this you can use a simple regex.

Converting from two spaces to four:
<?php
$yaml = preg_replace('/^(  +)/m', '$1$1', $yaml);
?>

Add two more $1 into the replacement for eight spaces.

down

nsa at succhia dot cz ¶

1 year ago

Note that NULL values will be converted to the tilde character "~".

This can be somehow counter-intuitive, but that is absolutely legit, and it seems it is a standard recognized by every Yaml parser. So, don't worry about that. Yaml reference:

http://yaml.org/spec/1.2-old/spec.html#id2805071