function PHP自定义函数 PHP
<?phpfunction test($sql){ require_once("../../config.php"); $query = sqlsrv_query($conn,$sql); if( $query === false) { die( print_r( sqlsrv_errors(), true) ); } $row = sqlsrv_fetch_array($query); echo $row[0];}test("SELECT COUNT(name) FROM tb1 GROUP BY name");test("SELECT COUNT(name) FROM tb2 GROUP BY name");?>
test("SELECT COUNT(name) FROM tb1 GROUP BY name");
test("SELECT COUNT(name) FROM tb2 GROUP BY name");
调用一个是没问题的,但两个以上就报错了,是为什么呢?
回复讨论(解决方案)
结束一次查询后,第二次要清理前面请求的结果
结束一次查询后,第二次要清理前面请求的结果 怎么清理前面请求的结果?
function test($sql){
require_once("../../config.php"); //已加载就不加载
$query = sqlsrv_query( $conn,$sql); //如果不加载(第二次执行时)$conn 不就不存在了吗?
....
}
老徐说的对,你的代码$conn要作为全局变量才行,不然二次调用$conn就不存在了
看看出错信息是否如此
另外,清理结果也是必需的,以前我就试过不清理导致两次结果交错混淆了
mysql是mysql_free_result(),你的代码看上去是sqlsever,不太清楚,估计是sqlsrv_free_stmt()
其他数据库一般都有类似函数
require_once("../../config.php"); 放在函数外面加载不行么
尽量不要在函数里引入文件,在调用函数的文件中引入文件
function test($sql){
require_once("../../config.php"); //已加载就不加载
$query = sqlsrv_query( $conn,$sql); //如果不加载(第二次执行时)$conn 不就不存在了吗?
....
}
老徐说的对,你的代码$conn要作为全局变量才行,不然二次调用$conn就不存在了
看看出错信息是否如此
另外,清理结果也是必需的,以前我就试过不清理导致两次结果交错混淆了
mysql是mysql_free_result(),你的代码看上去是sqlsever,不太清楚,估计是sqlsrv_free_stmt()
其他数据库一般都有类似函数 谢谢你们!!!在这里还想问个题外题,就是mssql_init这个函数,我把它换成 sqlsrv_init 就不行,是不是没有sqlsrv_init这个函数啊?那应该用哪个函数代替呢?
看手册,各家接口不同,不是说把函数名前缀换了就行的
看手册 http://php.chinaunix.net/manual/zh/ref.sqlsrv.php
<?phprequire_once("../../config.php");global $conn;$conn=$conn;function test($sql){ global $conn; $query = sqlsrv_query($conn,$sql); if( $query === false) { die( print_r( sqlsrv_errors(), true) ); } $row = sqlsrv_fetch_array($query); echo $row[0];}test("SELECT COUNT(name) FROM tb1 GROUP BY name");test("SELECT COUNT(name) FROM tb2 GROUP BY name");?>
<?phprequire_once("../../config.php");global $conn;$conn=$conn;function test($sql){ global $conn; $query = sqlsrv_query($conn,$sql); if( $query === false) { die( print_r( sqlsrv_errors(), true) ); } $row = sqlsrv_fetch_array($query); echo $row[0];}test("SELECT COUNT(name) FROM tb1 GROUP BY name");test("SELECT COUNT(name) FROM tb2 GROUP BY name");?>
你这个不行哦!!!
function test($sql){
require_once("../../config.php"); //已加载就不加载
$query = sqlsrv_query( $conn,$sql); //如果不加载(第二次执行时)$conn 不就不存在了吗?
....
}
<?php $a = test("SELECT COUNT(name) FROM tb1 GROUP BY name");$b = test("SELECT COUNT(name) FROM tb2 GROUP BY name"); //为什么我这些写它就直接输出了呢?我想把值存在变量里,再用 echo 来输出。?>
把 echo $row[0];
改为 return $row[0];
<?phprequire_once("../../config.php");global $conn;$conn=$conn;function test($sql){ global $conn; $query = sqlsrv_query($conn,$sql); if( $query === false) { die( print_r( sqlsrv_errors(), true) ); } $row = sqlsrv_fetch_array($query); echo $row[0];}test("SELECT COUNT(name) FROM tb1 GROUP BY name");test("SELECT COUNT(name) FROM tb2 GROUP BY name");?>
你这个不行哦!!!
<?phpglobal $conn;require_once("../../config.php");function test($sql){ global $conn; $query = sqlsrv_query($conn,$sql); if( $query === false) { die( print_r( sqlsrv_errors(), true) ); } $row = sqlsrv_fetch_array($query); echo $row[0];}test("SELECT COUNT(name) FROM tb1 GROUP BY name");test("SELECT COUNT(name) FROM tb2 GROUP BY name");?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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