为什么我的php/mysql搜索字符串只匹配最后一个关键字?

I have a search function that is supposed to take all the keywords in an array from $keywords_search and then create the correct mySQL statement to get the results. The problem is, when I search for multiple keywords, it seems to find only results that match the LAST keyword in the array. What am I doing wrong?I have a search function that is supposed to ta