pg_num_fields()
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
返回字段的数目
说明
pg_num_fields(resource $result): int
pg_num_fields()返回 PostgreSQL$result中的字段(列)数目。参数是由pg_query()函数返回的查询结果资源号。如果出错则返回-1。
Note:本函数以前的名字为pg_numfields()。
参见pg_num_rows()和pg_affected_rows()。
Here is a simple example for using pg_num_feilds, pg_num_rows and pg_result together. I'm simply SELECTing * from a table named markie on the current pg_connect(). <?php $pgsql_conn = pg_connect("dbname=mark host=localhost"); if (!$pgsql_conn) { print pg_last_error($pgsql_conn); exit; } $results = pg_query($pgsql_conn, "SELECT * FROM markie"); echo "<table border=1>\n"; for($lt = 0; $lt < pg_num_rows($results); $lt++) { echo "<tr>\n"; for($gt = 0; $gt < pg_num_fields($results); $gt++) { echo "<td>" . pg_result($results, $lt, $gt) . "</td>\n"; } echo "</tr>\n"; } echo "</table>\n"; pg_close($pgsql_conn); ?> This code snippet will print out the rows and columns into a HTML table. Regards, --mark