错误提示：Fatal error: Call to undefined function mysqli_num_row()

[huige728]

错误提示就如标题所示，网上也找了一圈，差不多都是说没有开启php_mysqli模块，我的wampserver环境本身已经开启，但是我还是去重新关闭在开启，结果都是一样，有一点很奇怪，网上一般都是在链接数据库的时候失败，但是我链接数据库没有提示失败，而是在使用mysqli_num_row时候出现错误

下面先上下我在查看phpinfo下mysqli下的开启情况
mysqli
MysqlI Support enabled
Client API library version mysqlnd 5.0.8-dev - 20102224 - $Id: 65fe78e70ce53d27a6cd578597722950e490b0d0 $
Active Persistent Links 0
Inactive Persistent Links 0
Active Links 0

Directive Local Value Master Value
mysqli.allow_local_infile On On
mysqli.allow_persistent On On
mysqli.default_host no value no value
mysqli.default_port 3306 3306
mysqli.default_pw no value no value
mysqli.default_socket no value no value
mysqli.default_user no value no value
mysqli.max_links Unlimited Unlimited
mysqli.max_persistent Unlimited Unlimited
mysqli.reconnect Off Off


下面是我的代码部分

<?php
require ('inc/config.php');
$page_title = '注册-CNode博客';
include ('inc/header.php');
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	require (MYSQL);
	$trimmed = array_map('trim', $_POST);
	$errors = array();
	if ($_POST['code'] != $_SESSION['code']) {
		$errors[] = '验证码不正确!';
	}
	if(empty($trimmed['username'])) {
		$errors[] = '用户名不能为空';
	} else {
		if (preg_match ('/^[A-Z \'.-]{5,20}$/i', $trimmed['username'])) {
			$un = mysqli_real_escape_string ($conn, $trimmed['username']);
		} else {
			$errors[] = '您的用户名格式不对';
		}
	}
	
	if(empty($trimmed['email'])) {
		$errors[] = '电子邮件地址不能为空';
	} else {
		if (filter_var($trimmed['email'], FILTER_VALIDATE_EMAIL)) {
			$e = mysqli_real_escape_string ($conn, $trimmed['email']);
		} else {
			$errors[] = '您的电子邮件地址格式不对';
		}
	}
	
	if(!empty($trimmed['password'])) {		
		if (preg_match ('/^\w{4,20}$/', $trimmed['password']) ) {
			if ($trimmed['password'] == $trimmed['notpassword']) {
				$p = mysqli_real_escape_string ($conn, $trimmed['password']);
			} else {
				$errors[] = '登录密码和确认密码不一致';
			}
		} else {
			$errors[] = '请输入有效的登录密码';
		}		
	} else {
		$errors[] = '登录密码不能为空';
	}	
	if(empty($trimmed['notpassword'])) {
		$errors[] = '确认密码不能为空';
	}
	
	if (empty($errors)) {
		// 确定电子邮件是否被使用
		$q = "SELECT user_id FROM users WHERE email='$e'";
		$r = mysqli_query ($conn, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($conn));
		if (mysqli_num_row($r) == 0) { // 如果查询验证电子邮件地址未被使用，则注册用户
			$a = md5(uniqid(rand(), true)); // 创建一个激活码（创建一个长度正好为32个字符的字符串）
			$q = "INSERT INTO users (username, email, password, active, registration_date) VALUES ('$un', '$e', SHA1('$p'), '$a', NOW() )";
			$r = mysqli_query ($conn, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($conn));	
			if (mysqli_affected_rows($conn) == 1) {
				$body = "感谢您的注册，激活您的帐户，请点击这里：\n\n";
				$body .= BASE_URL . 'activate.php?x=' . urlencode($e) . "&y=$a";
				mail($trimmed['email'], '确认注册', $body, 'From: [e-mail]');
				echo '<h3>感谢您的注册！一封确认邮件已经发送到您的邮箱。请在该电子邮件中单击链接，以激活您的帐户。</h3>';
				exit();
		 	} else { 
				echo '<p class="error">用户注册失败，为此我们表示抱歉，请在注册一次</p>';
			}		
		} else { // 查询验证出来的电子邮件地址已经被注册
			echo '<p class="error">电子邮件地址已经被注册</p>';
		}
	} else {
		foreach ($errors as $msg) { // Print each error.
			echo " - $msg<br />\n";
		}
	}
	mysqli_close($conn);
}
?>

<div class="wrap login">
	<div class="path"><a href="#">主页</a> > 注册</div>
	<div class="info">
    <form method="post" name="register" action="">
		<p>
		  <label for="username">用户名：</label><input type="text" name="username" id="username" class="text" value="<?php if (isset($trimmed['username'])) echo $trimmed['username']; ?>" />
		  <span>限5~20个字符，可用中文、英文、数字及“_”、“-”组成</span>
		</p>
        <p>
          <label for="email">电子邮件：</label><input type="text" name="email" id="email" class="text" value="<?php if (isset($trimmed['email'])) echo $trimmed['email']; ?>" />
          <span>请填写您的常用邮箱，它是您激活帐号和找回密码的凭证!</span>
        </p>        
		<p>
		  <label for="password">登录密码：</label><input type="password" name="password" id="password" class="text" value="<?php if (isset($trimmed['password'])) echo $trimmed['password']; ?>" />
		  <span>密码由4-20位字母、数字组成</span>
		</p>
		<p>
          <label for="notpassword">确认密码：</label><input type="password" name="notpassword" id="notpassword" class="text" value="<?php if (isset($trimmed['notpassword'])) echo $trimmed['notpassword']; ?>" />
          <span>请再次输入密码</span>
        </p>		
		<p>
		  <label for="yzm">验证码：</label><input type="text" name="code" id="yzm" class="text1" />
		  <img src="code.php" id="code" />
          <span>看不清，请重新点击验证码(注意大小写)</span>
		</p>
		<div class="submit">
		   <input type="submit" name="submit" class="btn-1" value="立即注册" />
		</div>
	</form>
	</div>	
</div>	
<?php
include ('inc/footer.php');
?>

[xuzuning]

print_r(get_extension_funcs('mysqli'));

你自己看看有没有 Array ( [0] => mysqli_affected_rows [1] => mysqli_autocommit [2] => mysqli_change_user [3] => mysqli_character_set_name [4] => mysqli_close [5] => mysqli_commit [6] => mysqli_connect [7] => mysqli_connect_errno [8] => mysqli_connect_error [9] => mysqli_data_seek [10] => mysqli_dump_debug_info [11] => mysqli_debug [12] => mysqli_errno [13] => mysqli_error [14] => mysqli_error_list [15] => mysqli_stmt_execute [16] => mysqli_execute [17] => mysqli_fetch_field [18] => mysqli_fetch_fields [19] => mysqli_fetch_field_direct [20] => mysqli_fetch_lengths [21] => mysqli_fetch_all [22] => mysqli_fetch_array [23] => mysqli_fetch_assoc [24] => mysqli_fetch_object [25] => mysqli_fetch_row [26] => mysqli_field_count [27] => mysqli_field_seek [28] => mysqli_field_tell [29] => mysqli_free_result [30] => mysqli_get_connection_stats [31] => mysqli_get_client_stats [32] => mysqli_get_charset [33] => mysqli_get_client_info [34] => mysqli_get_client_version [35] => mysqli_get_host_info [36] => mysqli_get_proto_info [37] => mysqli_get_server_info [38] => mysqli_get_server_version [39] => mysqli_get_warnings [40] => mysqli_init [41] => mysqli_info [42] => mysqli_insert_id [43] => mysqli_kill [44] => mysqli_more_results [45] => mysqli_multi_query [46] => mysqli_next_result [47] => mysqli_num_fields [48] => mysqli_num_rows 这个是你要的吗？但你写错了 [49] => mysqli_options [50] => mysqli_ping [51] => mysqli_poll [52] => mysqli_prepare [53] => mysqli_report [54] => mysqli_query [55] => mysqli_real_connect [56] => mysqli_real_escape_string [57] => mysqli_real_query [58] => mysqli_reap_async_query [59] => mysqli_rollback [60] => mysqli_select_db [61] => mysqli_set_charset [62] => mysqli_stmt_affected_rows [63] => mysqli_stmt_attr_get [64] => mysqli_stmt_attr_set [65] => mysqli_stmt_bind_param [66] => mysqli_stmt_bind_result [67] => mysqli_stmt_close [68] => mysqli_stmt_data_seek [69] => mysqli_stmt_errno [70] => mysqli_stmt_error [71] => mysqli_stmt_error_list [72] => mysqli_stmt_fetch [73] => mysqli_stmt_field_count [74] => mysqli_stmt_free_result [75] => mysqli_stmt_get_result [76] => mysqli_stmt_get_warnings [77] => mysqli_stmt_init [78] => mysqli_stmt_insert_id [79] => mysqli_stmt_more_results [80] => mysqli_stmt_next_result [81] => mysqli_stmt_num_rows [82] => mysqli_stmt_param_count [83] => mysqli_stmt_prepare [84] => mysqli_stmt_reset [85] => mysqli_stmt_result_metadata [86] => mysqli_stmt_send_long_data [87] => mysqli_stmt_store_result [88] => mysqli_stmt_sqlstate [89] => mysqli_sqlstate [90] => mysqli_ssl_set [91] => mysqli_stat [92] => mysqli_store_result [93] => mysqli_thread_id [94] => mysqli_thread_safe [95] => mysqli_use_result [96] => mysqli_warning_count [97] => mysqli_refresh [98] => mysqli_escape_string [99] => mysqli_set_opt )

[huige728]

真是和你说的一样，太粗心了，你给的方法很直观，谢谢