mysqli_result::fetch_fields

mysqli_fetch_fields

(PHP 5, PHP 7, PHP 8)

mysqli_result::fetch_fields -- mysqli_fetch_fields — Returns an array of objects representing the fields in a result set

Description

Object-oriented style

public mysqli_result::fetch_fields(): array

Procedural style

mysqli_fetch_fields(mysqli_result $result): array

This function serves an identical purpose to the mysqli_fetch_field() function with the single difference that, instead of returning one object at a time for each field, the columns are returned as an array of objects.

Parameters

result

Procedural style only: A mysqli_result object returned by mysqli_query(), mysqli_store_result(), mysqli_use_result() or mysqli_stmt_get_result().

Return Values

Returns an array of objects containing field definition information.

Object properties
PropertyDescription
nameThe name of the column
orgnameOriginal column name if an alias was specified
tableThe name of the table this field belongs to (if not calculated)
orgtableOriginal table name if an alias was specified
defUnused. Always an empty string
dbThe name of the database
catalogUnused. Always "def"
max_lengthThe maximum width of the field for the result set. As of PHP 8.1, this value is always 0.
lengthThe width of the field in bytes. For string columns, the length value varies on the connection character set. For example, if the character set is latin1, a single-byte character set, the length value for a SELECT 'abc' query is 3. If the character set is utf8mb4, a multibyte character set in which characters take up to 4 bytes, the length value is 12.
charsetnrThe character set number for the field.
flagsAn integer representing the bit-flags for the field.
typeThe data type used for this field
decimalsThe number of decimals for numeric fields, and the fractional seconds precision for temporal fields.

Examples

Example #1 Object-oriented style

<?php
$mysqli = new mysqli("127.0.0.1", "root", "foofoo", "sakila");

/* check connection */
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}

foreach (array('latin1', 'utf8') as $charset) {

// Set character set, to show its impact on some values (e.g., length in bytes)
$mysqli->set_charset($charset);

$query = "SELECT actor_id, last_name from actor ORDER BY actor_id";

echo "======================\n";
echo "Character Set: $charset\n";
echo "======================\n";

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("Length: %d\n", $val->length);
printf("charsetnr: %d\n", $val->charsetnr);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->type);
}
$result->free();
}
}
$mysqli->close();
?>

Example #2 Procedural style

<?php
$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "sakila");

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

foreach (array('latin1', 'utf8') as $charset) {

// Set character set, to show its impact on some values (e.g., length in bytes)
mysqli_set_charset($link, $charset);

$query = "SELECT actor_id, last_name from actor ORDER BY actor_id";

echo "======================\n";
echo "Character Set: $charset\n";
echo "======================\n";

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("Length: %d\n", $val->length);
printf("charsetnr: %d\n", $val->charsetnr);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->type);
}
mysqli_free_result($result);
}
}

mysqli_close($link);
?>

The above examples will output:

======================
Character Set: latin1
======================
Name:      actor_id
Table:     actor
Max. Len:  3
Length:    5
charsetnr: 63
Flags:     49699
Type:      2

Name:      last_name
Table:     actor
Max. Len:  12
Length:    45
charsetnr: 8
Flags:     20489
Type:      253

======================
Character Set: utf8
======================
Name:      actor_id
Table:     actor
Max. Len:  3
Length:    5
charsetnr: 63
Flags:     49699
Type:      2

Name:      last_name
Table:     actor
Max. Len:  12
Length:    135
charsetnr: 33
Flags:     20489

See Also