How to query the number of records returned in php

Method: 1. Use the mysql_num_rows function with the syntax "mysql_num_rows (result set)"; 2. Use the mysql_query function to execute the "COUNT(*)" query, and then use the mysql_fetch_row function to retrieve the numeric array from the result set.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP query statement, there are two ways to obtain the query the total number of records.

MySQLi process-oriented approach

$sql = "SELECT id, firstname, lastname FROM MyGuests"; $result = mysqli_query($conn, $sql); num_rows=mysqli_num_rows($result);

The first is to use the mysql_num_rows function, example code:

The second is to modify the query statement, using COUNT(*) as the query content, example Code:

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