mysqli_fetch_fields

Returns an array of objects representing the fields in a result set (PHP 5)
array mysqli_fetch_fields ( mysqli_result result )

Example 1497. Object oriented style

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<?php

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";


if ($result = $mysqli->query($query)) {


    /* Get field information for all columns */

    $finfo = $result->fetch_fields();


    foreach ($finfo as $val) {

        printf("Name:     %s\n", $val->name);

        printf("Table:    %s\n", $val->table);

        printf("max. Len: %d\n", $val->max_length);

        printf("Flags:    %d\n", $val->flags);

        printf("Type:     %d\n\n", $val->type);

    }

    $result->close();

}

/* close connection */
$mysqli->close();
?>

Example 1498. Procedural style

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<?php

$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {

    printf("Connect failed: %s\n", mysqli_connect_error());

    exit();

}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";


if ($result = mysqli_query($link, $query)) {


    /* Get field information for all columns */

    $finfo = mysqli_fetch_fields($result);


    foreach ($finfo as $val) {

        printf("Name:     %s\n", $val->name);

        printf("Table:    %s\n", $val->table);

        printf("max. Len: %d\n", $val->max_length);

        printf("Flags:    %d\n", $val->flags);

        printf("Type:     %d\n\n", $val->type);

    }

    mysqli_free_result($result);

}

/* close connection */
mysqli_close($link);
?>

Code Examples / Notes » mysqli_fetch_fields

jonathan

The "type" property will return a numerical representation of a field type instead of a "meaningful" string. Here is an array that may help you: <?php $mysqli_type = array(); $mysqli_type[0] = "DECIMAL"; $mysqli_type[1] = "TINYINT"; $mysqli_type[2] = "SMALLINT"; $mysqli_type[3] = "INTEGER"; $mysqli_type[4] = "FLOAT"; $mysqli_type[5] = "DOUBLE"; $mysqli_type[7] = "TIMESTAMP"; $mysqli_type[8] = "BIGINT"; $mysqli_type[9] = "MEDIUMINT"; $mysqli_type[10] = "DATE"; $mysqli_type[11] = "TIME"; $mysqli_type[12] = "DATETIME"; $mysqli_type[13] = "YEAR"; $mysqli_type[14] = "DATE"; $mysqli_type[16] = "BIT"; $mysqli_type[246] = "DECIMAL"; $mysqli_type[247] = "ENUM"; $mysqli_type[248] = "SET"; $mysqli_type[249] = "TINYBLOB"; $mysqli_type[250] = "MEDIUMBLOB"; $mysqli_type[251] = "LONGBLOB"; $mysqli_type[252] = "BLOB"; $mysqli_type[253] = "VARCHAR"; $mysqli_type[254] = "CHAR"; $mysqli_type[255] = "GEOMETRY"; ?>

rob

"max_length: The maximum width of the field for the result set." Not a native English speaker, I could be reading this wrong, but the max_length property doesn't reflect the maximum length of a field but returns the current length of the contents of a field (something that can easily be derived using the strlen() function): mysql> describe domains; +--------------+--------------+ | Field | Type | +--------------+--------------+ ... | name | varchar(255) | ... $info = $query->fetch_fields(); foreach ($info as $value) print "[max_length] ".$value->max_length."\n"; This results in: [max_length] 14 The number of characters in this field actually is 14, but the maximum length of the field is 255.

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