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#php
#kotlin
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#sql
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#typescript
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#format
PHP
Number to Ordinal (1st, 2nd, 3rd)
Convert an integer to its English ordinal form ("1st", "2nd", "3rd", "11th", "22nd", "103rd"). Pure rule-based; no library needed.
@admin
Bash
Substring + Find/Replace (parameter expansion)
Bash's ${var:offset:length} and ${var//pattern/replacement} let you do most string operations without ever spawning sed. Faster, and the syntax is portable across modern shells.
Bash
Default Value for Unset Variable
Three parameter-expansion idioms for "use this if the variable is empty / unset". Replaces the verbose `if [[ -z "$VAR" ]]; then VAR=default; fi` everywhere.
PHP
RGB ↔ Hex Conversion
Two-way conversion between #RRGGBB hex strings and [R, G, B] arrays. Handy when working with theme colors that come from both sources (CSS strings vs. RGB sliders).
Kotlin
OkHttp Client (Java interop)
OkHttp is the JVM-standard HTTP library. Works fine from Kotlin; use the `await()` extension from `okhttp3.coroutines` to get suspend support.
PHP
Compound Interest Calculator
Compute the future value of an investment compounded n times per year for t years. Returns both the final value and the interest earned.
PHP
Haversine Distance Between Two Coordinates
Compute the great-circle distance between two latitude/longitude points using the haversine formula. Returns kilometers; multiply by 0.621 for miles. Useful for "stores near me" features.
Bash
Uppercase / Lowercase / Title Case
Bash 4+ has built-in case conversion via parameter expansion. No need for `tr` or `awk` for most cases.
Kotlin
java.time — When You Need JVM Interop
On the JVM, `java.time` is fine — and often necessary for interop with Java APIs. Kotlin's extension methods make it ergonomic enough that you might never reach for kotlinx-datetime.
Java
java.time — Instant, LocalDate, ZonedDateTime
Java 8's `java.time` package replaced the broken `Date`/`Calendar`. Three types you actually use: `Instant` (UTC moment), `LocalDate` (date with no tz), `ZonedDateTime` (date+time in a zone).
Bash
Download with Progress Bar
Show a progress bar for long downloads. wget gives a great built-in bar; curl needs an explicit flag.
SQL
TRUNCATE vs DELETE
`DELETE` is logged per-row and respects triggers; `TRUNCATE` deallocates whole pages and resets the table to empty. `TRUNCATE` is much faster on large tables but has caveats (no WHERE, can't be rolled back in some DBs).
Kotlin
Sequences — Lazy Collections
A `List` materializes every intermediate `map`/`filter` result. A `Sequence` processes ONE element through the whole pipeline at a time — better for big inputs or short-circuiting (`first`, `take`).
Kotlin
Compose State Hoisting
Lift state UP to where it's needed. A composable becomes "stateless" (taking `value` + `onValueChange`) which makes it reusable and testable. The Compose mantra.
PHP
Simple File-Backed Cache
A tiny key-value cache with TTL, persisted as a serialized PHP file per key. Good enough for memoizing expensive computations on a single machine; replace with Redis when scaling out.
SQL
DELETE with JOIN / USING
Delete rows from one table conditional on a related table. PostgreSQL uses `USING`; MySQL uses join syntax in the DELETE. Run as a SELECT first to verify what you're about to remove.
PHP
Strip HTML Safely (whitelist tags)
Strip nearly all HTML from a string but keep a small whitelist (e.g. links, line breaks, inline formatting). Wraps strip_tags with sensible defaults and a callback to also drop event-handler attributes.