php - $_GET for MySQL query causing Unknown column error -

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i have series of links pass information new page run mysql query. 1 of links source code:

<a class="bloglink" href="parknews.php?tpf_news.park_id=5">

and code generates links:

<a class="bloglink" href="parknews.php?tpf_news.park_id=<?php echo $row2['park_id'];?>"> <?php echo $row2['name']; ?> </a>

the query uses info here:

$park_id = $_get['tpf_news.park_id']; $sql = 'select headline, story, date_format(date, "%d-%m-%y") date, name tpf_news inner join tpf_parks on tpf_news.park_id = tpf_parks.park_id tpf_news.park_id = $park_id order date desc' ;

this causes error display:

error fetching news: sqlstate[42s22]: column not found: 1054 unknown column '$park_id' in 'where clause'

i can't work out why not working. if in query replace where tpf_news.park_id = $park_id where tpf_news.park_id = 6 (or other number), works fine.

any ideas?

when strings in quotes variables aren't interpolated. need use double quotes instead:

$sql = "select headline, story, date_format(date, '%d-%m-%y') date, name tpf_news inner join tpf_parks on tpf_news.park_id = tpf_parks.park_id tpf_news.park_id = $park_id order date desc" ;

or use concatenation:

$sql = 'select headline, story, date_format(date, "%d-%m-%y") date, name tpf_news inner join tpf_parks on tpf_news.park_id = tpf_parks.park_id tpf_news.park_id =' .  $park_id .' order date desc' ;

fyi, wide open sql injections


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