連線資料庫

<?php
//連結資料庫
     $conn=mysqli_connect("localhost","root","","toupiao") or die("資料庫伺服器連線錯誤".mysql_error());
	 mysqli_query($conn,"set names utf8");
?>

執行查詢、插入、刪除等操作

$result = mysqli_query($conn,$sql);

查詢語句的兩種不同寫法

$query = mysqli_query($conn, "select * from social_message where address='{$address}'");

$query = mysqli_query($conn,"select * from school_message where school_name='".$school."'");
 

將查詢結果放入陣列中

$contents = array();
while($str = mysqli_fetch_array($result1))
{
	$contents[] = $str;
}

檢視資料庫執行後影響資料庫的行數

//檢視資料庫執行後影響資料庫的行數
	$num=mysqli_affected_rows($conn);
    if($num>=1){
        echo 1;
    }else{
        echo mysqli_error($conn);
    }