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POPHP PDO with bindParam vs bindValue?
 

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  1. POPHP PDO with bindParam vs bindValue?
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    <p><strong>SOLUTION</strong></p> <p>Change this:</p> <pre><code>foreach($fields as $dbfield =&gt; $field) { $value = isset($_POST[$field]) ? 1 : 0; $STH -&gt; bindParam( ':' . $dbfield, $value, PDO::PARAM_INT, 1 ); } </code></pre> <p>to this:</p> <pre><code>foreach($fields as $dbfield =&gt; $field) { $value = isset($_POST[$field]) ? 1 : 0; $STH -&gt; bindValue( ':' . $dbfield, $value, PDO::PARAM_INT ); } </code></pre> <hr> <p><strong>QUESTION</strong></p> <p>I have the following code, which doesn't give any errors, but it doesn't do what I need it to do:</p> <p><strong>PHP</strong></p> <pre><code>$fields = array( 'db_col_1' =&gt; 'cb_1', 'db_col_2' =&gt; 'cb_2', 'db_col_3' =&gt; 'cb_3' ); $parts = array(); foreach($fields as $dbfield =&gt; $field){ $parts[] = '`' . $dbfield . '` = :' . $dbfield; } $DBH = new PDO( "mysql:host=localhost;dbname=db", "user", "pass" ); $DBH -&gt; setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); //temp id $id = 1; $STH = $DBH -&gt; prepare( 'UPDATE `table1` SET ' . join(', ', $parts) . ' WHERE `id`= :id' ); $STH -&gt; bindParam( ':id', $id, PDO::PARAM_INT, 10 ); foreach($fields as $dbfield =&gt; $field) { $value = isset($_POST[$field]) ? 1 : 0; $STH -&gt; bindParam( ':' . $dbfield, $value, PDO::PARAM_INT, 1 ); } $STH -&gt; execute(); </code></pre> <p><strong>HTML</strong></p> <pre><code>&lt;input id="cb_1" name="cb_1" type="checkbox" value="cb_1" /&gt; &lt;br /&gt; &lt;input id="cb_2" name="cb_2" type="checkbox" value="cb_2" /&gt; &lt;br /&gt; &lt;input id="cb_3" name="cb_3" type="checkbox" value="cb_3" /&gt; </code></pre> <p>The database goes get updated, but if I check the checkboxes as follows:</p> <p><strong>SAMPLE CHECKBOX STATES</strong></p> <pre><code>cb_1 = 1 cb_2 = 1 cb_3 = 0 </code></pre> <p>Every column in the db gets <code>0</code>.</p> <p>If I check the checkboxes as follows:</p> <p><strong>SAMPLE CHECKBOX STATES</strong></p> <pre><code>cb_1 = 0 cb_2 = 0 cb_3 = 1 </code></pre> <p>Every column in the db gets <code>1</code>.</p> <p>Anyone know how to fix this?</p> <p>Could it be because <code>bindParam</code> binds the actual variable <code>$value</code> (by reference) which I think, by the time the loop ends, has a value based on <code>$_POST['cb_3']</code>?</p> <p>So I think I am supposed to be using <code>bindValue</code>? But not sure how.. I've checked the documentation, but find it confusing.</p>
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    1. COA [tag wiki](http://stackoverflow.com/tags/pdo/info) contains an advise on this very matter
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    2. COI think you should have tried `bindValue()` before asking here.
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