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- WooCommerce: Add fees when the cart also contains items of a specific category
- This tutorial is designed to address a common need in WooCommerce: automatically add or reduce costs when the cart contains multiple items of specific categories at the same time. We will use code examples to explain in detail how to implement this function and provide considerations to ensure the stability and maintainability of the code. This method achieves accurate cost control by checking whether all specified product categories exist in the shopping cart.
- PHP Tutorial . Backend Development 817 2025-08-06 17:03:01
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- How to structure a navigation menu with semantic HTML
- Building navigation menus using semantic HTML can improve accessibility, SEO and code clarity, and should be correctly structured with, and elements. 1. Use the main navigation area to wrap it and identify it as an important navigation block; 2. Use and organize link lists to reflect the logical relationship between projects; 3. Add aria-label to multiple navigation areas or match titles to clearly distinguish the purpose; 4. The drop-down menu adopts a nested structure to keep the hierarchy clear; 5. Cooperate with skiplink to improve the keyboard user operation experience. This method is simple and standard and highly compatible, and is the best practice for building barrier-free navigation.
- HTML Tutorial . Web Front-end 120 2025-08-06 16:59:01
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- Streamlining Data Extraction: Combining `array_column` and `array_filter`
- Use array_filter and array_column to efficiently filter and extract fields in associative arrays. 1. First use array_filter to filter data according to conditions, such as keeping status as active users; 2. Then use array_column to extract the specified fields from the filtering results, such as 'name' or 'id'; 3. You can chain two functions and one line of code to implement "filter first and then extract", such as obtaining the name of the active user or the user ID that meets the active and administrator roles at the same time; 4. Although chain calls are concise, performance should be paid attention to when processing super-large data sets, and filtering at the data source level should be given priority. This method avoids manual loops and temporary variables to make the code clearer
- PHP Tutorial . Backend Development 273 2025-08-06 16:55:01
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- Monitoring MySQL Database Health with Percona Toolkit
- Monitoring MySQL health can be implemented using the PerconaToolkit tool set. 1. Check the data consistency of the master-slave replication status by pt-table-checksum, and then repair it through pt-table-sync after discovering an exception; 2. Use pt-query-digest to analyze slow query to find time-consuming SQL and optimize it by analyzing the log; 3. Real-time monitoring can use pt-heartbeat to detect master-slave delays, and pt-stalk automatically grabs diagnostic information when system abnormalities; 4. Other tools such as pt-online-schema-change support online modification of table structure, pt-index-usage analyzes index usage, p
- Mysql Tutorial . Database 435 2025-08-06 16:53:00
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- How to use CSS clamp() for responsive typography?
- clamp()inCSSenablesfluid,responsivetypographybysettingavaluebetweenaminimum,preferred,andmaximumsize;1.Useclamp(min,preferred,max)todefinescalablefontsizes;2.Setminandmaxinremforaccessibility;3.Usevwinthepreferredvaluewitharemoffsetforsmoothscaling;4
- CSS Tutorial . Web Front-end 718 2025-08-06 16:51:01
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- How to Manage Auto-Incrementing Primary Keys in MySQL?
- Auto-incrementingprimarykeysinMySQLaremanagedeffectivelybyfollowingkeypractices:1.UnderstandthatAUTO_INCREMENTensuresunique,monotonicallyincreasingIDs,withgapsbeingnormalduetorollbacks,deletions,orfailedinserts.2.SetthestartingvalueusingALTERTABLEuse
- Mysql Tutorial . Database 928 2025-08-06 16:50:01
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- How to use check constraints to enforce data rules in MySQL?
- MySQL supports CHECK constraints to force domain integrity, effective from version 8.0.16; 1. Add constraints when creating a table: Use CREATETABLE to define CHECK conditions, such as age ≥18, salary > 0, department limit values; 2. Modify the table to add constraints: Use ALTERTABLEADDCONSTRAINT to limit field values, such as name non-empty; 3. Use complex conditions: support multi-column logic and expressions, such as end date ≥start date and completion status must have an end date; 4. Delete constraints: use ALTERTABLEDROPCONSTRAINT to specify the name to delete; 5. Notes: MySQL8.0.16, InnoDB or MyISAM needs to be quoted
- Mysql Tutorial . Database 413 2025-08-06 16:49:01
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- Add WooCommerce Fees based on Cart Product Category
- This tutorial is designed to guide developers how to automatically add custom fees (such as discounts) when the cart contains items in both specified categories (such as "drinks" and "bundles") in WooCommerce Cart. We will provide tested code examples and explain in detail how it works, ensuring you can easily integrate this feature into your WooCommerce store.
- PHP Tutorial . Backend Development 559 2025-08-06 16:45:01
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- Choosing Your Weapon: A Deep Dive into `array_map` vs. `array_walk`
- Usearray_mapwhenyouneedanewarraywithtransformedvalues,asitreturnsanewarraywithoutmodifyingtheoriginal.2.Usearray_walkwhenyouwanttomodifytheoriginalarrayinplaceorperformsideeffectslikelogging,asitoperatesbyreferenceandreturnsaboolean.3.Avoidusingarray
- PHP Tutorial . Backend Development 252 2025-08-06 16:42:02
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- How to make an HTML element not visible
- display:noneremovestheelementfromlayoutandtakesupnospace,makingitinaccessibletoscreenreaders;2.visibility:hiddenhidestheelementbutpreservesitsspaceinlayoutandusuallyhidesitfromscreenreaders;3.thehiddenattributefunctionslikedisplay:nonebydefault,remov
- HTML Tutorial . Web Front-end 737 2025-08-06 16:40:01
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- WooCommerce: Add fees when shopping carts also contain specific categories of items
- This article describes how to use WooCommerce's woocommerce_cart_calculate_fees hook to automatically add fees when the cart contains items with specified categories (such as "drinks" and "bundles"). The article provides detailed code examples and explains how to correctly check whether multiple items in the shopping cart have been specified at the same time, thereby avoiding the incorrect application of fees.
- PHP Tutorial . Backend Development 673 2025-08-06 16:39:00
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- Mastering PHP Superglobals: A Deep Dive into Global Scope
- SuperglobalsinPHParepredefined,always-availablevariablesthatholddatafromuserinput,serverenvironment,sessions,andmore,accessibleinallscopeswithoutdeclaration.Themainsuperglobalsare:$GET—datafromURLparameters;$POST—datafromHTTPPOSTrequestslikeforms;$RE
- PHP Tutorial . Backend Development 655 2025-08-06 16:36:01
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- `continue` Within a `switch` Inside a Loop: An Edge Case Explained
- continueinsideaswitchstatementnestedwithinalooptargetstheloop,nottheswitch.2.Itskipstheremainingcodeintheloopbodyandproceedstothenextiteration.3.Thisbehaviorcanbypassstatementsaftertheswitch,leadingtounintendedflow.4.Alwaysusebreaktoexitaswitchcaseno
- PHP Tutorial . Backend Development 666 2025-08-06 16:33:01
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- Stateful Web Applications: Advanced Session Management with $_SESSION and $_COOKIE
- $_SESSION and $_COOKIE are the core mechanisms for implementing web application state management in PHP; 1. $_SESSION stores user data through the server and relies on a unique session ID (usually stored in a cookie named PHPSESSID) to maintain user status. It requires calling session_start() to initialize, which has high data security; 2. $_COOKIE stores a small amount of data on the client side, which can be used to persist login status, user preferences or reconnect sessions; 3. Security practices include calling session_regenerate_id(true) after logging in to prevent session fixed attacks, and setting secure cookie parameters (such as secure, h
- PHP Tutorial . Backend Development 729 2025-08-06 16:29:01
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