Found a total of 10000 related content
What is the role of spl_autoload_register() in PHP's class autoloading mechanism?
Article Introduction：spl_autoload_register() is a core function used in PHP to implement automatic class loading. It allows developers to define one or more callback functions. When a program tries to use undefined classes, PHP will automatically call these functions to load the corresponding class file. Its main function is to avoid manually introducing class files and improve code organization and maintainability. Use method is to define a function that receives the class name as a parameter, and register the function through spl_autoload_register(), such as functionmyAutoloader($class){require_once'classes/'.$class.'.php';}spl_
2025-06-09
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335
How to make an object iterable in Python?
Article Introduction：In Python, to make an object iterable, you need to implement the __iter__ method and return an iterator with the __next__ method; the specific steps are as follows: 1. Define the __iter__ method in the class, and return itself or another iterator object that implements the __next__ method; 2. If you use the generator function to implement __iter__, you can automatically manage the state and iterative logic through the yield keyword; 3. Every time you call iter(), you should return a new iterator to ensure that multiple loops do not interfere with each other, and throw a StopIteration exception at the end of the iteration to prevent infinite loops.
2025-07-02
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709
How can you implement custom iterators in Python using __iter__ and __next__?
Article Introduction：To implement a custom iterator, you need to define the __iter__ and __next__ methods in the class. ① The __iter__ method returns the iterator object itself, usually self, to be compatible with iterative environments such as for loops; ② The __next__ method controls the value of each iteration, returns the next element in the sequence, and when there are no more items, StopIteration exception should be thrown; ③ The status must be tracked correctly and the termination conditions must be set to avoid infinite loops; ④ Complex logic such as file line filtering, and pay attention to resource cleaning and memory management; ⑤ For simple logic, you can consider using the generator function yield instead, but you need to choose a suitable method based on the specific scenario.
2025-06-19
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776
Example of using Late Static Binding in PHP.
Article Introduction：Delayed static binding in PHP: flexible database queries
Lazy static binding (LSB) is a feature in PHP that allows a subclass to reference a static property or method of its parent class using the static keyword. This makes it possible to implement dynamic behavior in classes, which is especially useful in inheritance and subclass functionality customization. The core of delayed static binding lies in the use of the static keyword: when the PHP interpreter encounters the static attribute when compiling a function, it will delay determining its value until runtime. The value ultimately comes from the class that calls the function.
Application scenario: dynamic database query
Suppose you are developing a web application with a database. You have a Database base class that contains the methods for interacting with the database
2025-01-16
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813
What are the new features in PHP 8 (8.0, 8.1, 8.2, 8.3)?
Article Introduction：PHP 8.0 to 8.3 introduces a number of new features to improve language capabilities. 1. PHP8.1 supports union types (UnionTypes), allowing function parameters or return values ??to declare multiple types, such as int|float; 2. Introduce read-only attributes and classes to ensure immutability after initialization; 3. Add enumeration types to reduce the use of magic strings; 4. Support first-class citizen callable syntax to simplify functional programming; 5. Introduce Fiber to implement collaborative multitasking; 6. Add never return type to make it clear that the function does not return; 7. PHP8.0 has added str_contains() function to improve string judgment readability; 8. Introduce match expressions instead of switch statements to be more concise and safe;
2025-06-28
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282
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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777
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1407
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1026
Terraria: How To Make A Loom
Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make
2025-01-10
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