PHP mysqli_fetch_assoc()用法及代码示例

定义和用法

PHP 结果对象(属于 mysqli_result 类)表示 MySQL 结果，由 SELECT 或 DESCRIBE 或 EXPLAIN 查询返回。

mysqli_fetch_assoc() 函数接受一个结果对象作为参数，并检索给定结果对象中当前行的内容，并将它们作为关联数组返回。

用法

mysqli_fetch_assoc($result);

参数

Sr.No	参数及说明
1	result(Mandatory) 这是一个表示结果对象的标识符。

返回值

PHP mysqli_fetch_assoc() 函数返回一个关联数组，其中包含结果对象的当前行。如果没有更多行，此函数返回 NULL。

PHP版本

这个函数最初是在 PHP 版本 5 中引入的，适用于所有后续版本。

示例

以下示例演示了 mysqli_fetch_assoc() 函数的用法(程序风格) -

<?php
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   mysqli_query($con, "CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created.....\n");
   mysqli_query($con, "INSERT INTO myplayers values(1, 'Sikhar', 'Dhawan', 'Delhi', 'India')");
   mysqli_query($con, "INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   mysqli_query($con, "INSERT INTO myplayers values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
   print("Record Inserted.....\n");

   //Retrieving the contents of the table
   $res = mysqli_query($con, "SELECT * FROM myplayers");

   //Fetching all the rows as objects
   while($obj = mysqli_fetch_assoc($res)){
      print("ID:".$obj["ID"]."\n");
      print("First_Name:".$obj["First_Name"]."\n");
      print("Last_Name:".$obj["Last_Name"]."\n");
      print("Place_Of_Birth:".$obj["Place_Of_Birth"]."\n");
      print("Country:".$obj["Country"]."\n");
   }
   //Closing the statement
   mysqli_free_result($res);

   //Closing the connection
   mysqli_close($con);
?>

这将产生以下结果 -

Table Created.....
Record Inserted.....
ID:1
First_Name:Sikhar
Last_Name:Dhawan
Place_Of_Birth:Delhi
Country:India
ID:2
First_Name:Jonathan
Last_Name:Trott
Place_Of_Birth:CapeTown
Country:SouthAfrica
ID:3
First_Name:Kumara
Last_Name:Sangakkara
Place_Of_Birth:Matale
Country:Srilanka

示例

在面向对象的风格中，这个函数的语法是 $result->fetch_assoc();以下是面向对象样式 $minus 中此函数的示例；

<?php
   //Creating a connection
   $con = new mysqli("localhost", "root", "password", "mydb");

   $con -> query("CREATE TABLE Test(Name VARCHAR(255), Age INT)");
   $con -> query("insert into Test values('Raju', 25),('Rahman', 30),('Sarmista', 27)");
   print("Table Created.....\n");

   $stmt = $con -> prepare( "SELECT * FROM Test WHERE Name in(?, ?)");
   $stmt -> bind_param("ss", $name1, $name2);
   $name1 = 'Raju';
   $name2 = 'Rahman';

   //Executing the statement
   $stmt->execute();

   //Retrieving the result
   $result = $stmt->get_result();

   //Fetching all the rows as arrays
   while($obj = $result->fetch_assoc()){	
      print("Name:".$obj["Name"]."\n");
      print("Age:".$obj["Age"]."\n");
   }

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

这将产生以下结果 -

Table Created.....
Name:Raju
Age:25
Name:Rahman
Age:30