Course 2857
Course Introduction:Course introduction: 1. Cross-domain processing, token management, route interception; 2. Real interface debugging, API layer encapsulation; 3. Secondary encapsulation of Echarts and paging components; 4. Vue packaging optimization and answers to common problems.
Course 1795
Course Introduction:Apipost is an API R&D collaboration platform that integrates API design, API debugging, API documentation, and automated testing. It supports grpc, http, websocket, socketio, and socketjs type interface debugging, and supports privatized deployment. Before formally learning ApiPost, you must understand some related concepts, development models, and professional terminology. Apipost official website: https://www.apipost.cn
Course 5521
Course Introduction:(Consult WeChat: phpcn01) The comprehensive practical course aims to consolidate the learning results of the first two stages, achieve flexible application of front-end and PHP core knowledge points, complete your own projects through practical training, and provide guidance on online implementation. Comprehensive practical key practical courses include: social e-commerce system backend development, product management, payment/order management, customer management, distribution/coupon system design, the entire WeChat/Alipay payment process, Alibaba Cloud/Pagoda operation and maintenance, and project online operation. .....
Course 5172
Course Introduction:(Consult WeChat: phpcn01) Starting from scratch, you can solve conventional business logic, operate MySQL with PHP to add, delete, modify, and query, display dynamic website data, master the MVC framework, master the basics of the ThinkPHP6 framework, and learn and flexibly master all knowledge involved in PHP development. point.
Course 8713
Course Introduction:(Consult WeChat: phpcn01) The learning objectives of the front-end development part of the 22nd issue of PHP Chinese website: 1. HTML5/CSS3; 2. JavaScript/ES6; 3. Node basics; 4. Vue3 basics and advanced; 5. Mobile mall/ Website background homepage layout; 6. Automatic calculation of tabs/carousels/shopping carts...
isset() and empty() - what to use
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Using an empty function with a Foreach loop
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Course Introduction:PHP empty reports an error because empty only detects variables, and detecting anything that is not a variable will result in a parsing error. The solution is to directly detect the value returned by the function without using empty, with code such as "$length=strlen('test'); echo empty($length);”.
2020-08-29 comment 0 1978
Course Introduction:In PHP, empty means "empty" and is a built-in function used to check whether a variable is empty. The syntax is "empty($var)"; when a variable value is 0, empty string, "0.0", ""0"", NULL, FALSE, empty array, empty() considers this variable to be equal to empty.
2022-03-03 comment 0 3310
Course Introduction:The usage method of empty function in php is [bool empty (mixed $var)]. The empty() function is used to check whether a variable is empty. If the variable does not exist or the value is equal to false, it will be considered not to exist.
2021-05-13 comment 0 3044
Course Introduction:PHP's empty function is used to check whether a variable is empty. It is used as follows: if(empty($variable)){//The variable is empty}else{//The variable is not empty} In this example, $variable is the variable to be checked. If $variable is empty, that is, does not exist or has a value of false, 0, "", null, array(), the code in the if statement block will be executed. Otherwise, the code in the else statement block will be executed. You can also directly use the empty function to determine whether the value of an expression is empty, for example: if(empty($foo||$bar)){//The value of the expression is empty}else{//Expression
2024-03-01 comment 0 189
Course Introduction:In PHP, empty means empty. It is a built-in function used to check whether a variable is empty. The syntax is "empty (mixed $var)"; when the variable does not exist or the value of the variable is used as false, then the The variable is judged to not exist, and the empty() function does not generate a warning.
2022-03-07 comment 0 5536