Found a total of 10000 related content
How to Iterate through UTF-8 Strings Character by Character in PHP
Article Introduction：This article discusses the issue of accurately iterating through UTF-8 strings character by character in PHP. It highlights the limitations of using bracket indexing and presents preg_split as an effective solution that preserves character integrity
2024-10-23
comment 0
625
PHP get ASCII value of a character using ord
Article Introduction：The most direct way to get the ASCII value of a character in PHP is to use the ord() function, which returns the ASCII value of the first character of the string. 1.ord() receives a string parameter and only returns the ASCII value of the first character, such as ord('A') returns 65; 2. Be cautious when processing Chinese or special characters, because ord() only returns the first byte value of multi-byte characters, such as ord('In') returns 228; 3. Practical applications include judging character types and implementing simple encryption, such as judging whether it is a letter or number by comparing the ASCII range, or combining chr() to realize Caesar's password displacement.
2025-07-16
comment 0
932
PHP file processing: reading, processing and writing tutorial
Article Introduction：This tutorial details how to use PHP for file operations, including reading data from files, processing data (such as numerical calculations and conditional judgments), and writing processed results to a new file. Through a specific grade processing example, you will learn how to use core functions such as file(), fopen(), fwrite() and fclose(), and master key techniques such as data type conversion, loop traversal and file flow management when processing file content.
2025-08-25
comment 0
628
Processing variadic parameter arrays and implementing statistical methods in JavaScript class constructor
Article Introduction：This article details how to design a robust statistical analysis class in JavaScript. Unnecessary deconstruction is avoided by passing an array of variable length to the class constructor and storing it as an instance property. The article demonstrates how to implement a series of core statistical methods, including mean, median, mode, variance, and standard deviation, and provides clear code examples and best practices to help developers build efficient data processing tools.
2025-09-02
comment 0
377
UTF-8 String Index Processing and Cross-Language Compatibility Guide in Go Language: Solving the Differences of Bytes and Character Indexing
Article Introduction：This article explores the fundamental differences between byte index and character index in Go string processing, as well as the index misalignment caused when interacting with character encoding sensitive systems such as Java/GWT. In view of the feature of functions such as regexp returning byte index in Go language, the article provides two core solutions: one is to use regexp.FindReaderIndex and strings.NewReader to directly obtain character indexes, and the other is to implement an efficient byte-to-character position mapping mechanism for manual conversion to ensure the consistency and accuracy of string operations across systems.
2025-09-08
comment 0
812
How to get the last character of a string in php
Article Introduction：Use substr($str,-1) to get the last character of the string, which is suitable for single-byte characters; if it is a multi-byte character such as UTF-8, mb_substr($str,-1,1,'UTF-8') should be used for correct processing, and it is recommended to check that the string is not empty first.
2025-08-31
comment 0
415
