mysql - php variable as the column name in mysql_fetch_assoc variable -


the following code shows error : undefined index: $col_name in ...

$table="my_table"; $col_name="my_col";  $sql="select * $table";  $result=mysql_query($sql);  while($row=mysql_fetch_assoc($result)){  $db_value = trim(htmlspecialchars_decode($row['$col_name']));  }

but if replace last line inside while loop following 1 :

$db_value = trim(htmlspecialchars_decode($row['my_col']));

it's ok.

how can use php variable column name instead of using column name directly ?

use double quotes,

$db_value = trim(htmlspecialchars_decode($row["$col_name"]));

or here can avoid quotes,

$db_value = trim(htmlspecialchars_decode($row[$col_name]));

read strings more quotes.


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