当q = 时，Solr返回所有结果(Solr return all results when q=)

 我正在使用PHP Codeigniter框架和solr-php-client来构建搜索应用程序。 
 
 我有两页 - 
 
 
 
 只有一个输入框的搜索页面 
 
 
 结果页面，当用户在搜索页面中输入搜索词时，将显示结果 
 
 
 问题是，除非我输入一个搜索词， solr-php-client没有返回任何结果，而且url只是"http://localhost:8080/search/?q=" ，它不会做任何事情。 但是当我输入一个搜索词，例如“apple”作为例如，它会重定向到结果页面而没有任何问题，并且网址变为"http://localhost:8080/rdsearch/?q=apple" 
 
 我想要实现的是 - 当用户未在搜索页面中输入搜索词或q为空时，如"http://localhost:8080/search/?q=" ，它应该直接指向结果页面并显示所有结果（类似于solr查询*:* ） 

I am using PHP Codeigniter framework with solr-php-client to build a search application.
 
I have two pages - 
 
 
 
a search page with just a single input box 
 
 
a results page which will display results when user enters a search term in search page
 
 
The issue is, unless I enter a search term solr-php-client is not returning any results and for which the url would just be "http://localhost:8080/search/?q=" and it wont do anything. But when I enter a search term such as "apple" as an eg., it redirect to results page with matching results without any issue and the url becomes "http://localhost:8080/rdsearch/?q=apple"
 
What I would like to achieve is - When user does not enter a search term in the search page or when q is empty as in "http://localhost:8080/search/?q=", it should simply direct to results page and show all the results (similar to a solr query *:*) 

原文：https://stackoverflow.com/questions/21272577