Tag: strings
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Most referenced — #strings
Character Encoding 2String Interpolation & Heredoc/Nowdoc 2sprintf() — Format Strings in PHP 1Regular Expressions in JavaScript 1Regex Syntax 1Tries (Prefix Trees) 1Key String Functions (str_contains, str_starts_with, str_ends_with…) 1Trie (Prefix Tree) 1
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Tag total254 pings
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Trie (Prefix Tree)
A tree where each node represents a character — paths from root to leaf spell out keys, enabling O(m) lookup, prefix search, and autocomplete where m is key length, independent of dataset size.
1mo ago
data_structures intermediate
mb_string — Multibyte String Functions PHP 4.0+
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.
2mo ago
php intermediate
sprintf() — Format Strings in PHP PHP 4.0+
sprintf() builds a string by substituting typed placeholders (%s, %d, %f, %05d) with values — safer and more expressive than string concatenation or interpolation for formatted output, especially for numbers, padding, and locale-independent formatting.
2mo ago
php beginner
str_contains / str_starts_with / str_ends_with PHP 8.0+
PHP 8.0 added str_contains(), str_starts_with(), and str_ends_with() — replace strpos() !== false patterns with these readable alternatives.
2mo ago
php beginner
Template Literals ES2015
Backtick strings with ${expression} interpolation — the JavaScript equivalent of PHP's double-quoted strings and heredoc.
2mo ago
javascript beginner
Character Encoding PHP 5.0+
How text is stored as bytes — ASCII (128 chars), Latin-1 (256 chars), UTF-8 (1-4 bytes, backwards compatible), and UTF-16 are the key encodings developers encounter.
2mo ago
i18n intermediate
Regular Expressions in JavaScript ES2015
JS regex syntax, flags (g, i, m, s, u, d), methods (test, match, matchAll, replace, split), and the critical differences from PHP's PCRE.
2mo ago
javascript intermediate
Tries (Prefix Trees) PHP 5.0+
A tree where each path from root to node spells a prefix — enabling O(m) insert, lookup, and prefix search where m is the string length, regardless of dictionary size.
2mo ago
data_structures advanced
Heredoc / Nowdoc PHP 5.0+
Heredoc (<<<EOT) and Nowdoc (<<<'EOT') provide multi-line string syntax; Nowdoc is the single-quoted equivalent with no variable interpolation.
2mo ago
php beginner
Key String Functions (str_contains, str_starts_with, str_ends_with…) PHP 5.0+
PHP 8.0 introduced readable string helpers that replace strpos() !== false idioms for common substring checks.
2mo ago
php beginner
Regex Syntax PHP 5.3+
Regular expression syntax — anchors, quantifiers, character classes, groups, and alternation — the building blocks for pattern matching in PHP and all languages.
2mo ago
regex intermediate
Sliding Window An algorithmic technique that maintains a window of elements over a sequence, expanding or contracting it to find subarrays or substrings satisfying a condition in O(n).
2mo ago
algorithms intermediate
String Algorithms
Efficient string searching (KMP, Boyer-Moore, Rabin-Karp), edit distance (Levenshtein), and compression algorithms — foundational for search, diff tools, and bioinformatics.
2mo ago
algorithms advanced
String Interpolation & Heredoc/Nowdoc PHP 5.0+
PHP's double-quoted strings and heredoc syntax interpolate variables; nowdoc is the single-quoted equivalent — each with distinct escaping rules.
2mo ago
php beginner