php基本知识

1.php数组基础：
<?php
$ary2 = "zqhung_hongzequan_zqhong";
$arr3 =explode("_",$ary2);//拆分字符串
echo $arr3[1];//打印出来的结果是hongzequan
$ary1 = array("aa","bb");
$ary1[0]="zqhung";//修改数组中的值
echo $ary1[0],"<br>";//打印出来的结果是zqhung
$ary3 = array("id"=>55);
$aa = is_array($ary1);//判断变量是否为数组
echo $aa,"<br>";
echo count($ary1),"<br>";//判断数组中元素的个数
foreach($arr3 as $key=>$value)//遍历数组中的元素
{
echo $value,"<br>";
}
?>
 2.连接mysql
<?php
$conn = @ mysql_connect("localhost", "root", "") or die("连接失败");//连接mysql
mysql_select_db("quanquanfly", $conn) or die("连接失败");//连接quanquanfly数据库
$sql = "insert into aa (name,age) value ('1','2')";
mysql_query($sql, $conn);//执行插入操作
/**
* 执行查询并显示操作
*/
$sql1 = "select * from aa";
$query = mysql_query($sql1,$conn);
$select = mysql_fetch_array($query);
while ($select = mysql_fetch_array($query)) {
echo $select[age], "<br><hr>";
}
echo mysql_num_rows($query);//表中的条目数
mysql_close($conn);//关闭连接
?>