msql_num_rows

(PHP 4, PHP 5, PHP 7)

msql_num_rows — Get number of rows in result

说明

msql_num_rows ( resource $query_identifier ) : int

msql_num_rows() returns the number of rows in a result set.

参数

result

resource 型的结果集。此结果集来自对 msql_query() 的调用。

返回值

Returns the number of rows in the result set.

参见

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User Contributed Notes 1 note

up
-13
dd at hibm dot org
10 years ago
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;
?>
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