PHP错误oci_bind_by_name（）：用于绑定的无效变量

Question

I have a PHP file which will extract data from an RSS feed and insert it into a database. Usually I wrap each field with a custom function to replace quotes but no longer need it (because of a change in requirements). For some reason when I use the logic below I get an error "error oci_bind_by_name(): Invalid variable used for bind" but if I wrap each field in the custom function like this:

$guid = customfunction($item->guid); 

it works, why?

Thank you

foreach($rss->channel->item as $item) {




   print '<a href="'.$item->link.'">'.$item->title.'</a><br />';

    $guid = $item->guid;
    $title = $item->title;
    $link = $item->link;
    $pubDate = $item->pubDate;
    $description = $item->description;
    $content = $item->content;

    $stid = oci_parse($spConn,"INSERT INTO table123
                (sku, title, link, pubDate, field1, field2)
                VALUES(:guid_bv, :title_bv, :link_bv, :pubDate_bv, :description_bv, :content_bv)");


                oci_bind_by_name($stid, ":guid_bv", $guid);
                oci_bind_by_name($stid, ":title_bv", $title);
                oci_bind_by_name($stid, ":link_bv", $link);
                oci_bind_by_name($stid, ":pubDate_bv", $pubDate);
                oci_bind_by_name($stid, ":description_bv", $description);
                oci_bind_by_name($stid, ":content_bv", $content);

                oci_execute($stid);

Answer 1

By default, oci_bind_by_name() requires only 3 parameters, and treats all variables that you bind as characters. It works fine for most cases however, but if you are try to add a float, binary data or integers it might scream at you and complain about invalid variable used. To fix this either you need to either give oci_bind_by_name another set of parameters, ex:

  if(is_numeric($v2)){ 
    oci_bind_by_name($stmth, $bvar, $v2,  8, OCI_B_INT); 
  }else{ 
    $v2 = (string) $v2; 
    oci_bind_by_name($stmth, $bvar, $v2, -1, SQLT_CHR); 
  } 

or simply wrap your variable in strval() like this

oci_bind_by_name($stid, ":description_bv", strval($description));
oci_bind_by_name($stid, ":content_bv", strval($content));

While I strongly advise creating/using a custom class that will handle all variable binds for you, using strval() with your variables should eliminate all "Invalid variable used for bind" errors when passing integers, doubles or other formats.