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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
MySQL charset=utf8mb4 PHP 5.1+
The correct MySQL character set for full Unicode support — including emoji and supplementary characters that the older utf8 charset cannot store.
6mo ago PHP beginner
Bidirectional Text (BiDi) 🧠 1
The handling of text that mixes left-to-right (LTR) and right-to-left (RTL) scripts in the same document — governed by the Unicode Bidirectional Algorithm, with CSS and HTML direction attributes controlling display.
6mo ago i18n intermediate
Collation & Locale-Aware Sorting PHP 7.0+ 🧠 1
Locale-specific rules for ordering strings alphabetically — determining that ä sorts near a in German but after z in traditional Swedish, and that sorting must not rely on byte values for Unicode text.
6mo ago i18n intermediate
mb_string — Multibyte String Functions PHP 4.0+ 🧠 2
PHP's native string functions operate on bytes, not characters. The mb_string extension provides mb_strlen(), mb_substr(), mb_strtolower() and 100+ equivalents that correctly handle multibyte encodings like UTF-8.
6mo ago PHP intermediate
PHP 6 — The Version That Never Shipped
PHP 6 was a major development effort (2005–2010) that aimed to bring native Unicode support to PHP but was abandoned due to complexity and performance problems — its features were later cherry-picked into PHP 5.3 and 5.4.
6mo ago PHP beginner
Regex Flags (i, g, m, s, x, u) PHP 5.3+ 🧠 1
Modifiers appended to a regex pattern that change matching behaviour — case-insensitivity, multiline mode, dotall mode, extended whitespace, and Unicode awareness.
6mo ago Regex beginner
PHP Intl Extension PHP 5.3+ 🧠 3
PHP's built-in internationalisation extension wrapping ICU — MessageFormatter, Collator, NumberFormatter, DateFormatter, and Normalizer for correct multilingual handling.
6mo ago i18n intermediate
PHP Intl Extension — Unicode PHP 5.3+ 🧠 2
Grapheme functions, Normalizer, and Transliterator — correct multilingual text handling beyond what mb_string provides, including emoji and combining characters.
6mo ago PHP advanced
Unicode & Multibyte Regex PHP 5.3+ 🧠 2
The u flag enables UTF-8 mode and \p{} Unicode property classes — essential for correctly matching text in any language.
6mo ago Regex intermediate
Unicode Fundamentals PHP 5.0+ 🧠 7
Unicode assigns every character a code point — UTF-8 encodes these as 1-4 bytes, making it the universal encoding for text on the web.
6mo ago i18n intermediate
✓ schema.org compliant