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mysqli_fetch_lengths (PHP 5) mysqli_fetch_lengths (no version information, might be only in CVS) result->lengths -- Returns the lengths of the columns of the current row in the result set DescriptionProcedural style: array mysqli_fetch_lengths ( mysqli_result result ) Object oriented style (property): class mysqli_result { array lengths }
The mysqli_fetch_lengths() function returns an array containing the
lengths of every column of the current row within the result set represented by the
result parameter. If successful, a numerically indexed array
representing the lengths of each column is returned or FALSE on failure.
返回值
An array of integers representing the size of each column (not including
any terminating null characters). FALSE if an error occurred.
mysqli_fetch_lengths() is valid only for the current row of the result set.
It returns FALSE if you call it before calling mysqli_fetch_row/array/object or after retrieving
all rows in the result.
例例子 1. Object oriented style |
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT * from Country ORDER BY Code LIMIT 1";
if ($result = $mysqli->query($query)) {
$row = $result->fetch_row();
foreach ($result->lengths as $i => $val) {
printf("Field %2d has Length %2d\n", $i+1, $val);
}
$result->close();
}
$mysqli->close();
?>
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例子 2. Procedural style |
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT * from Country ORDER BY Code LIMIT 1";
if ($result = mysqli_query($link, $query)) {
$row = mysqli_fetch_row($result);
foreach (mysqli_fetch_lengths($result) as $i => $val) {
printf("Field %2d has Length %2d\n", $i+1, $val);
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
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上例将输出： Field 1 has Length 3
Field 2 has Length 5
Field 3 has Length 13
Field 4 has Length 9
Field 5 has Length 6
Field 6 has Length 1
Field 7 has Length 6
Field 8 has Length 4
Field 9 has Length 6
Field 10 has Length 6
Field 11 has Length 5
Field 12 has Length 44
Field 13 has Length 7
Field 14 has Length 3
Field 15 has Length 2 |
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mysqli_fetch_fields