本文实例为大家分享了php实现查询功能的具体代码，供大家参考，具体内容如下
输入关键字效果
代码：
<body><h1>汽车信息</h1><?phprequire"DBDA.class1.php";//$type 代表SQL语句的类型，0代表增删改，1代表查询$db = new DBDA();//如果没有提交数据，显示所有//如果有提交数据，根据关键字查询显示$name = "";$tj1 = " 1=1 ";//第一个条件，对应名称，注意空格$tj2 = " 1=1 ";//第二个条件，对应系列，注意空格if(!empty($_POST["name"])){ $name = $_POST["name"]; $tj1 = " name like '%{$name}%'";}if(!empty($_POST["brand"])){ $brand = $_POST["brand"]; $tj2 = " brand like '%{$brand}%'";}//总条件$tj ="{$tj1} and {$tj2}";$sql = "select * from car where ".$tj;//注意where后空格/*echo $sql;*/?><form action="chaxun.php" method="post"><div>名称：<input type="text" name="name" value="<?php echo $name ?>"/>系列：<input type="text" name="brand"/><input type="submit" value="查询" /></div></form><br/><table width="100%" border="1" cellpadding="0" cellspacing="0"> <tr> <td>代号</td> <td>名称</td> <td>系列</td> <td>上市时间</td> <td>价格</td> </tr><?php//只适用于单条件查询/*$sql = "select * from car";$name="";if(!empty($_POST["name"])){ $name = $_POST["name"]; $sql = "select * from car where name like '%{$name}%' ";}*/$arr = $db->query($sql);foreach($arr as $v) { $str = str_replace($name,"<span style='color:red'>{$name}</span>",$v[1]); echo "<tr> <td>{$v[0]}</td> <td>{$str}</td> <td>{$v[2]}</td> <td>{$v[3]}</td> <td>{$v[7]}</td> </tr>"; }?></table></body></html>所引用的封装类
<?phpclass DBDA{ public $host = "localhost"; public $uid = "root"; public $pwd = "123"; public $dbname = "newssystem"; //执行SQL语句返回相应的结果 //$sql 要执行的SQL语句 //$type 代表SQL语句的类型，0代表增删改，1代表查询 function query($sql,$type=1) { $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname); $result = $db->query($sql); if($type) { //如果是查询，显示数据 return $result->fetch_all(); } else { //如果是增删改，返回true或者false return $result; } }}
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