It should be noted that when using SolrObject::getPropertyNames(), the array keys have an invisible character that needs to be trim()'d to work correctly.
(PECL solr >= 0.9.2)
SolrObject::getPropertyNames — Returns an array of all the names of the properties
此函数没有参数。
Returns an array.
It should be noted that when using SolrObject::getPropertyNames(), the array keys have an invisible character that needs to be trim()'d to work correctly.