When developing with PHP, the realpath_cache_size is an important configuration item related to performance. It controls the size of the PHP file path cache. Typically, when we encounter a realpath_cache_size returning 0, it means PHP has failed to effectively cache path information during file path resolution, which may affect system performance. This article will analyze the common causes of realpath_cache_size returning 0 and provide corresponding solutions.

String encoding conversion and cleanup are very common operations. When handling text in different encoding formats—especially in cross-platform applications or when dealing with external data sources—ensuring character correctness and consistency can be a challenge. Both convert_cyr_string and str_replace are useful tools in PHP, and today we’ll explore how they can work together to achieve encoding cleanup and text normalization.

The strcspn function in PHP is used to find the first occurrence of any character from a specified set in a string. Its function definition is as follows:

Extracting domain names from URLs is a common requirement in web development. PHP offers many functions for string manipulation, and the stristr function can be used to extract and work with domain names in URLs. This article explores how to use stristr to achieve this goal.

What is the exploit function? exploit is a built-in string function in PHP, which is used to split a string into an array according to the specified delimiter. The basic syntax is as follows:

What is rawurldecode? The rawurldecode() function is used to decode URL-encoded strings. It converts the percent sign encoding in the URL (such as %20 for space) back to the original character. Unlike urldecode(), rawurldecode() will handle encoding strictly in accordance with the RFC 3986 standard, especially when dealing with spaces, it decodes %20 into spaces without converting the plus sign (+) into spaces.

How to Correctly Use the rawurldecode Function in PHP to Decode URL-encoded Strings and Practical Tips

In PHP development, generating user-friendly URLs (so-called SEO URLs or pseudo-static URLs) is a common requirement. It not only improves the user experience, but also helps search engines inclusion. Most developers will choose to use Apache's mod_rewrite or Nginx's rewrite function to implement it, but PHP itself also provides some auxiliary mechanisms, such as output_add_rewrite_var(), which can work in specific scenarios, especially when you are using a query string-based system and want to achieve pseudo-static effects.

1. Introduction to the working principle of output_add_rewrite_var output_add_rewrite_var is a built-in function in PHP, which is used to automatically append a specified query variable and its value to all output URLs. Common usages are as follows:

How to Use PHP file_get_contents to Fetch Webpage Content from a Remote URL Explained

In web development, we often need to parse URLs to extract useful information from them for further processing or storage. For example, analyze user sources, filter a certain type of domain name request, or record the specific structure of each API request. PHP provides us with a powerful built-in function - parse_url(), which can help us complete this task efficiently.

URL redirection is a common requirement in modern web applications. Whether it is SEO optimization, user experience improvement, or compatibility processing of old links, a reasonable URL redirection mechanism is indispensable. As a language widely used in back-end development, PHP's built-in parse_url function provides powerful and concise tools for processing URLs. In this article, we will explore in-depth how to use the parse_url function to efficiently handle various URL redirect scenarios on the server side to implement a unified redirection strategy.

Processing and parsing URLs is a common requirement in web development. The parse_url function is a very practical tool provided by PHP. It can decompose a URL into multiple components, such as protocols, hosts, paths, query strings, etc. This article will introduce how to use parse_url to implement an algorithm for comparing URL structures, and demonstrate how to replace the domain name in the URL with gitbox.net.

When using PHP to process URLs, parse_url is a very common function. It can decompose a URL into different parts, such as protocol (scheme), host (host), path (path), query parameters (query), etc. However, in actual development, we may encounter a special situation: more than one question mark (?) appears in the URL. At this time, can parse_url still work normally? This article will conduct a detailed analysis of this issue.

parse_url is a common function used to break up URLs into their components, such as scheme, host, port, path, query, etc. This function is very practical in daily development, but when the URL contains an IPv6 address, its behavior will be slightly more complicated. This article will explore the behavior and precautions of parse_url when dealing with URLs containing IPv6 addresses.

In daily development, PHP's parse_url function is a common tool for processing URL strings. It can disassemble a URL into multiple components, such as protocol (scheme), host (host), port (port), path (path), query (query), etc. Although parse_url is most commonly used to parse HTTP or HTTPS URLs, it also supports parsing URLs of other protocol types, such as FTP, mailto, file, etc.

When using the PHP's parse_url function to process a URL, if the URL contains the @ symbol, parsing errors or the results do not match expectations. This behavior often confuses developers, especially when dealing with URLs containing authentication information or complex query parameters.

When doing web development, we often need to extract useful information from URLs, such as protocols, hosts, paths, query parameters, etc. PHP's built-in parse_url function provides a convenient way to parse these parts of a URL. This article will focus specifically on how this function behaves when processing URLs with fragments.

In web development, processing URLs entered by users is a very common requirement. In order to ensure the security of the system and avoid malicious links or unsafe jumps, it is often necessary to implement a URL whitelist filtering system. The parse_url function provided by PHP can help us easily parse the URL structure, thereby effectively judging and filtering various parts of the URL.

In PHP development, you often encounter the need to parse and process URLs. The parse_url function is a powerful tool built into PHP, which can help us quickly disassemble various components of a URL. Combined with the string replacement function str_replace, we can clean and optimize the URL more flexibly, such as replacing domain names, deleting unnecessary parameters, etc.