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

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

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: $q\n
MySQL Error: " . mysqli_error($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', $body, 'From: 414412984@qq.com');				echo '
感谢您的注册！一封确认邮件已经发送到您的邮箱。请在该电子邮件中单击链接，以激活您的帐户。
';				exit();		 	} else { 				echo '
用户注册失败，为此我们表示抱歉，请在注册一次
';			}				} else { // 查询验证出来的电子邮件地址已经被注册			echo '
电子邮件地址已经被注册
';		}	} else {		foreach ($errors as $msg) { // Print each error.			echo " - $msg
\n";		}	}	mysqli_close($conn);}?>
	
主页 > 注册
	
    
		
		  用户名：" />		  限5~20个字符，可用中文、英文、数字及“_”、“-”组成		
        
          电子邮件：" />          请填写您的常用邮箱，它是您激活帐号和找回密码的凭证!        
        		
		  登录密码：" />		  密码由4-20位字母、数字组成		
		
          确认密码：" />          请再次输入密码        
				
		  验证码：		            看不清，请重新点击验证码(注意大小写)		
		
		   
	
	
	
	

回复讨论(解决方案)

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
)

真是和你说的一样，太粗心了，你给的方法很直观，谢谢