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Editorial Team
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Asked: 2026-05-23T22:04:23+00:00

I have the following code, which almost works: <?php if( $_SERVER[‘REQUEST_METHOD’] == ‘POST’ )

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I have the following code, which almost works:

<?php
    if( $_SERVER['REQUEST_METHOD'] == 'POST' ) {
        $fields = array(
            'col1'  => 'cb1', 
            'col2'  => 'cb2', 
            'col3'  => 'cb3', 
            'col4'  => 'cb4', 
            'col5'  => 'cb5',
            'col6'  => 'cb6', 
            'col7'  => 'cb7', 
            'col8'  => 'cb8', 
            'col9'  => 'cb9', 
            'col10' => 'cb10'
        );

        $parts = array();

        foreach( $fields as $dbfield => $field ) {
            $parts[] = '`' . $dbfield . '` = :' . $dbfield;
        }

        $dbh = new PDO( 'mysql:host=localhost;dbname=database', 'user', 'pass' );
        $dbh -> setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

        $sth = $dbh -> prepare( 'UPDATE `table1` SET ' . join( ', ', $parts ) . ' WHERE `id` = :id' );

        // temp simulation value
        $id = 1;

        $sth -> bindParam( ':id', $id, PDO::PARAM_INT, 4 );

        foreach( $fields as $dbfield => $field ) {

            $value = isset( $_POST[$field] ) ? 1 : 0;
            $sth -> bindParam( ':' . $dbfield, $value, PDO::PARAM_INT, 4 );

        }

        $sth -> execute();

        $dbh = null;
    }
?>

<html>
    <head>
        <title></title>
    </head>

    <body>
        <form method="post">

            <input type="checkbox" name="cb1" /><br />

            <input type="checkbox" name="cb2" /><br />

            <input type="checkbox" name="cb3" /><br />

            <input type="checkbox" name="cb4" /><br />

            <input type="checkbox" name="cb5" /><br />

            <input type="checkbox" name="cb6" /><br />

            <input type="checkbox" name="cb7" /><br />

            <input type="checkbox" name="cb8" /><br />

            <input type="checkbox" name="cb9" /><br />

            <input type="checkbox" name="cb10" />

            <input type="submit" value="save" />

        </form>
    </body>
</html>

It should be inserting 0’s or 1’s depending on the checkbox selected, but for some reason it inserts 0’s into all columns no matter which checkboxes are selected. However, if the last checkbox is selected, it inserts a 1 into all columns.

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1 Answer

  1. Editorial Team

    bindParam binds the actual variable $value (by reference) which, by the time the loop ends, has a value based on $_POST['cb10']. (Recall that PHP has no block scope, so there is only one $value variable, as opposed to one for each loop iteration.)

    I think you meant to use bindValue.

    Take a peek at the documentation:

    bool PDOStatement::bindParam ( mixed $parameter , mixed &$variable [,
    int $data_type = PDO::PARAM_STR [, int $length [, mixed
    $driver_options ]]] )

    bool PDOStatement::bindValue ( mixed $parameter
    , mixed $value [, int $data_type = PDO::PARAM_STR ] )

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