通过mysql表中的变量插入

Question

I want to insert data into mysql table through user defined variables. Here is what i am doing. Its gives no error but also don't upload any data into table.

$sql="insert into table(".$columns_name.") values(".$val.")";

Here is how the the values of the variables are:
$columns_name= col1, col2, col3, col4
$val= aa, 11, 22, bb

Answer 1

Possible issues:

1- table is a reserved word. your table name can't be 'table'. (I assume you wrote it as a mock name).

2- the format of column names and values in INSERT query is wrong.

Try this before query:

$columns_name = "`$columns_name`";
$columns_name = str_replace(', ', '`, `',$columns_name);

$val = "'$val'";
$val = str_replace(', ', "', '",$val);