Question

php中mysql模糊查询问题

$sql="select * from book where bookname like '%".trim($txt_book)."%'"
哪位大侠帮我解释一下语句中的各个引号，看不懂了

Answer 1

"select * from book where bookname like '%"
trim($txt_book)
"%"

分成这三个部分，trim()这一块是可以不用引号。