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A proposal to add a native clamp() function to PHP that constrains a value within specified minimum and maximum bounds. The function returns the value if it's within range, or the nearest bound if outside. It supports mixed types (numbers, strings, DateTime objects) following PHP's comparison rules, throws ValueError for invalid bounds (min > max or NAN bounds), and offers performance improvements over userland implementations using min/max. The RFC is currently under discussion for inclusion in the next PHP 8.x release.

PHP: rfc:clamp

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Adding a clamp() function in PHP 8.6

Adding a clamp() function in PHP 8.6

Fantastic to see this get traction after my failed attempt at adding clamp to 8.2. Wish kylekatarnls all the best with the updated RFC. 🔥

I do not like non strict way:
<code> clamp ( mixed $value, mixed $min, mixed $max ) : mixed</code>
as for me better to have separate functions like
<pre><code>clampInt ( int $value, int $min, int $max ) : int
clampDate ( DateTimeInterface $value, DateTimeInterface $min, DateTimeInterface $max ) : DateTimeInterface
....
</code></pre>
will expect some strict ClampHelpers in frameworks