(PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8)
xml_set_start_namespace_decl_handler — 建立起始命名空间声明处理器
Set a handler to be called when a namespace is declared. Namespace declarations occur inside start tags. But the namespace declaration start handler is called before the start tag handler for each namespace declared in that start tag.
parserA reference to the XML parser.
handler
handler is a string containing the name of a
function that must exist when xml_parse() is called
for parser.
The function named by handler must accept
three parameters, and should return an integer value. If the
value returned from the handler is false (which it will be if no
value is returned), the XML parser will stop parsing and
xml_get_error_code() will return
XML_ERROR_EXTERNAL_ENTITY_HANDLING.
$parser
, string $prefix
, string $uri
)parserprefixuri
If a handler function is set to an empty string, or false, the handler
in question is disabled.
Note: 除了函数名，含有对象引用的数组和方法名也可以作为参数。
成功时返回 true， 或者在失败时返回 false。