(PECL yaml >= 0.4.0)
yaml_parse — Parse a YAML stream
Convert all or part of a YAML document stream to a PHP variable.
inputThe 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.
callbacksContent handlers for YAML nodes. Associative array of YAML tag => callable mappings. See parse callbacks for more details.
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.
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."
}
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.
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.
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.
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)