If you would like to just find out how many rows are returned by a query without actually using the results, then it's much more efficient to use SQL count function (specially for large tables with millions of rows).
<?php
$sql = "SELECT COUNT(indexed-field) AS cnt FROM some-table";
$r = mysql_query($sql);
$row = mysql_fetch_object($r);
echo $row->cnt;
?>
msql_num_rows
(PHP 4, PHP 5 < 5.3.0)
msql_num_rows — 結果における行の数を得る
説明
msql_num_rows
( resource
$query_identifier
) : intmsql_num_rows() は、結果セットにおける 行の数を返します。
返り値
結果セットにおける行の数を返します。
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User Contributed Notes 1 note
dd at hibm dot org ¶
15 years ago
