预处理语句获得总记录数的函数及其调用

<?php
$host = ‘localhost‘;
$user = ‘root‘;
$pass = ‘‘;
$dbname = ‘db‘;
$charset = ‘utf8‘;
$m = new mysqli($host,$user,$pass,$dbname);
$m->set_charset($charset);
//$tn为表名，$w为条件
function get_count($tn,$w=‘1=1‘){
	global $m;
	$stmt=$m->prepare("select count(*) from $tn where $w");
	$stmt->execute();
	$stmt->bind_result($c);
	$stmt->fetch();
	$stmt->free_result();
	$stmt->close();
	return $c;
}

$re=get_count(‘stu‘,‘sscore=90‘);
echo $re;