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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418
Making Custom Objects Iterable: Implementing Iterator and IteratorAggregate
Article Introduction：To make PHP custom objects available in foreach, you need to implement the Iterator or IteratorAggregate interface. 1. Use the Iterator interface to implement five methods: current(), key(), next(), return() and valid(). It is suitable for scenarios where fine control of the iteration process is required, as shown in the TaskList class example; 2. Use the IteratorAggregate interface to implement the getIterator() method and return a Traversable object (such as ArrayIterator), which is suitable for scenarios where existing data is simply wrapped, such as TaskCollec
2025-08-05
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683
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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752
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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850
PHP efficiently manages cache files: differentiated cleaning strategies based on suffixes
Article Introduction：This tutorial is designed to guide how to efficiently manage cached files with specific naming rules in PHP and implement differentiated cleaning strategies based on file suffixes. For files whose file names end with a specific string, such as -100.json, a longer retention time can be set; while other files are cleaned at regular frequency. The article will focus on how to use PHP 8's str_ends_with() function, combined with file system iterator, to build a flexible and superior cache cleaning script, and at the same time provide a PHP 7 compatibility solution to ensure the precise execution of cache management policies.
2025-08-29
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973
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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850
How to create a helper php function in Laravel?
Article Introduction：There are three common ways to create auxiliary PHP functions in Laravel. 1. Use helpers.php file: Create Helpers.php in the app/ directory, write the function, add a path in the autoload.files of composer.json and run composerdump-autoload to implement global calls; 2. Use macroable features: add custom methods to existing Laravel classes such as Collection through the macro() method, which conforms to the framework design style; 3. Create service classes: suitable for complex logic, such as creating HelperService class encapsulation methods and through dependency injection or app
2025-07-22
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412
Implementing Locale-Aware String Sorting in PHP Arrays
Article Introduction：To implement locale-based string sorting in PHP, you must use the Collator class in the Intl extension, 1. Create a Collator object and specify a locale (such as 'fr_FR' or 'de_DE'); 2. Use asort() to keep the key name or sort() sort index array; 3. Optionally set the intensity level (such as PRIMARY ignores accents, and TERTIARY is case-sensitive and accents); 4. If there is no Intl extension, you can use setlocale() with strcoll() as an alternative; finally ensure that the strings are sorted correctly according to the semantic rules of the target language, and avoid the problem of the default sort() function sorting by ASCII value.
2025-08-06
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409
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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369
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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935
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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1555
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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