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In PHP, the strip_tags() function is a commonly used tool that helps you remove all HTML and PHP tags from a string, leaving only plain text. This is especially important when handling data from user input or external sources, ensuring data security and readability while preventing malicious script injection or excessive HTML tags from affecting page display.

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When working with PHP image processing, the “headers already sent” error often appears when using imagecreatetruecolor. This article explains the causes of this issue and provides practical solutions to fix it.

In PHP programming, determining data types is a common and important task. PHP provides several built-in functions to help developers check variable types, among which is_double and is_numeric are frequently used. Although both deal with numeric types, they have different focuses and use cases. This article explains the differences between these two functions and explores how to use them together to improve type checking accuracy.

In PHP development, APCu (Alternative PHP Cache User) serves as a user-level caching solution that can significantly boost application performance. APCu accelerates data access by storing key-value pairs in memory, but sometimes we need to manually clear specific cache entries. In APCu, the APCUIterator::rewind and apcu_delete functions help efficiently clear cache.

This article explains how to use PHP’s array_combine() function to merge two arrays into a single associative array, complete with examples and practical use cases.

In PHP development, the setlocale() function and the LC_TIME constant are often used to control the localization of date and time display. By setting the appropriate locale identifier, programs can correctly display dates and times according to different language and regional conventions. This article explains in detail how to use setlocale() with LC_TIME to format dates and quickly achieve localized display.

In PHP programming, output buffering is a powerful tool that allows precise control over when page content is sent, enhancing performance and user experience. Especially when gradual page output is needed, ob_start and ob_flush are two essential functions. They let developers buffer content before sending it and gradually or instantly flush it to the browser, which is crucial for pages handling large amounts of data or dynamically generated content.

In PHP, arrays are one of the most commonly used data structures. They can store multiple values, making it easier to perform various operations. For array manipulation, we often rely on built-in functions like krsort and array_slice, which are used for reverse key sorting and extracting part of an array, respectively.

By inserting memory_get_usage() at key points in your code, you can monitor memory usage in real time and quickly identify memory leaks or unnecessary memory consumption. Here’s a simple example:

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This article explains how to use PHP’s array_combine() function to merge two arrays into a single associative array, including practical examples and important considerations.

After setting environment variables, we often need to read them in the program. There are two ways to do this:

When dealing with multibyte encoded strings (such as UTF-8, GBK, etc.), it is common to encounter garbled text or truncation issues, especially during string operations or slicing. PHP provides several functions to handle these issues, and mb_substitute_character is a particularly useful tool. This article explains how to use mb_substitute_character to prevent string truncation and garbled text problems.

When using PHP to interact with a MySQL database, you might encounter mysqli::$connect_error returning garbled text. This issue is usually caused by incorrect character encoding settings, resulting in unreadable error messages from the database.