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Editorial Team
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Asked: 2026-05-25T15:44:17+00:00

I have a query: $startdate= date(‘Y-m-d H:i:s’,strtotime(-1 week)); $query = SELECT title FROM new_books

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I have a query:

$startdate= date('Y-m-d H:i:s',strtotime("-1 week"));

$query = "SELECT title FROM new_books ".
         "WHERE timestamp >= '$startdate' ";
$newbooks = mysql_query($query) or die (mysql_error());

Is the value of $startdate evaluated when $query is set, or when it’s called by mysql_query()?

For example say the above query returns 0 results (mysql_num_rows($newbook)==0) could I change $startdate and then call $newbooks = mysql_query... again, or would I need to set $query again first?

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1 Answer

  1. Editorial Team

    The variable is evaluated at the time $query is set.

    It’s exactly like doing this:

    $query = "SELECT title FROM new_books ".
         "WHERE timestamp >= '" . $startdate . "' ";

    If you want to execute the same query multiple times with different parameters, use prepared statements:

    $query = $mysqli->prepare("SELECT title FROM new_books WHERE timestamp >= :startdate");

$query->bind_params("s", $startdate);
$query->execute();
...

$query->bind_params("s", $an_other_startdate);
$query->execute();
...

    See the examples at http://docs.php.net/manual/en/mysqli.prepare.php

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