Definition and Usage
定义和用法

The mysql_affected_rows() function returns the number of affected rows in the previous MySQL operation.
mysql_affected_rows()函数的作用是：取得前一次 MySQL 操作所影响的记录行数。

This function returns the number of affected rows on success, or -1 if the last operation failed.
如果该函数成功执行，将返回记录行数；如果失败，将返回“-1”。

Syntax
语法

mysql_affected_rows(connection)

Example
案例

<?php
$con = mysql_connect("localhost","mysql_user","mysql_pwd");
if (!$con) { die("Could not connect: " . mysql_error()); }

mysql_select_db("mydb");
mysql_query("DELETE FROM mytable WHERE id < 5");
$rc = mysql_affected_rows();
echo "Records deleted: " . $rc;

mysql_close($con);
?>

The output of the code above could be:
上述代码将输出下面的结果：

Records deleted: 4

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