(PECL yaml >= 0.4.0)
yaml_parse_file — Parse a YAML stream from a file
Convert all or part of a YAML document stream read from a file to a PHP variable.
Path to the file.
Document to extract from stream (-1 for all documents, 0 for first document, ...).
If ndocs is provided, then it is filled with the number of documents found in stream.
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.