(PHP 5, PHP 7, PHP 8)
mysqli_result::$field_count -- mysqli_num_fields — Gets the number of fields in the result set
Stile orientato agli oggetti
Stile procedurale
Returns the number of fields in the result set.
resultSolo nello stile procedurale: un identificatore di resultset restituito da mysqli_query(), mysqli_store_result() o mysqli_use_result().
An int representing the number of fields.
Example #1 Stile orientato agli oggetti
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$result = $mysqli->query("SELECT Name, CountryCode, District, Population FROM City ORDER BY ID LIMIT 1");
/* Get the number of fields in the result set */
$field_cnt = $result->field_count;
printf("Result set has %d fields.\n", $field_cnt);Example #2 Stile procedurale
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
$result = mysqli_query($link, "SELECT Name, CountryCode, District, Population FROM City ORDER BY ID LIMIT 1");
/* Get the number of fields in the result set */
$field_cnt = mysqli_num_fields($result);
printf("Result set has %d fields.\n", $field_cnt);I precedenti esempi visualizzeranno:
Result set has 4 fields.