觉得这样写条件应该可以执行的。可是查第一个书名查的到,查其它的查不到,不知道问题在哪if(strlen('".$_POST["name"]."')!=0)
{
$query="select * from books.book where book_name='".$_POST["name"]."'";
}else if(strlen('".$_POST["id"]."')!=0){
$query="select * from books.book where book_id='".$_POST["id"]."'";
}else
if(strlen('".$_POST["book_author"]."')!=0){
$query="select * from books.book where book_author='".$_POST["book_author"]."'";
}else
if(strlen('".$_POST["book_publisher"]."')!=0){
$query="select * from books.book where book_publisher='".$_POST["book_publisher"]."'";
}else
if(strlen('".$_POST["book_date"]."')!=0){
$query="select * from books.book where book_date='".$_POST["book_date"]."'";
}
{
$query="select * from books.book where book_name='".$_POST["name"]."'";
}else if(strlen('".$_POST["id"]."')!=0){
$query="select * from books.book where book_id='".$_POST["id"]."'";
}else
if(strlen('".$_POST["book_author"]."')!=0){
$query="select * from books.book where book_author='".$_POST["book_author"]."'";
}else
if(strlen('".$_POST["book_publisher"]."')!=0){
$query="select * from books.book where book_publisher='".$_POST["book_publisher"]."'";
}else
if(strlen('".$_POST["book_date"]."')!=0){
$query="select * from books.book where book_date='".$_POST["book_date"]."'";
}
这个条件永远成立,后面的不用考虑了因为这个语句是判断字符串".$_POST["name"]."的长度不为零,是字符串,跟任何变量没任何关系*注意php的单引号用法,LZ要去补习
strlen('".$_POST["name"]."')
strlen($_POST['name'])