<code>您的位置:商品分类栏目 分类ID 分类树 分类名称 父类ID 父类路径 商品分类管理 6 家电 0 0, 修改 | 复制 | 删除 15 黑白电视机 6 0,6, 修改 | 复制 | 删除 27 洗衣机 6 0,6, 修改 | 复制 | 删除 28 液晶电视机 6 0,6, 修改 | 复制 | 删除 3 女装 0 0, 修改 | 复制 | 删除 12 休闲裤 3 0,3, 修改 | 复制 | 删除 7 手机 0 0, 修改 | 复制 | 删除 8 iphone 7 0,7, 修改 | 复制 | 删除 10 iphone6s 8 0,7,8, 修改 | 复制 | 删除 9 华为 7 0,7, 修改 | 复制 | 删除 11 华为mate9 9 0,7,9, 修改 | 复制 | 删除 19 vivo 7 0,7, 修改 | 复制 | 删除 26 vivoX7 19 0,7,19, 修改 | 复制 | 删除 //上表怎么做商品分类删除?删除父级分类=父级+子级 $id=$_GET['id']; $sql="select path from type WHERE path like '%$id%'"; $rs=mysql_query($sql); $arr=mysql_fetch_assoc($rs); if($arr){ $path=" and path like '%$id%'"; }else{ $path=''; } $where="where id={$id}{$path}"; $sql2="delete from type $where"; //echo $sql2;die(); $rs=mysql_query($sql2); if(mysql_affected_rows()>0){ echo '删除成功'; }else{ echo '删除失败'; } break; //我写的代码为什么不能删除有子级分类的商品呢?只能把子分类删完才能执行父类 //是where and的前后顺序问题吗? 比如删除女装是,需要先把休闲裤删了才行,但我想直接删完,应该怎么做呢??</code>

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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