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acos	asin

Math Functions	Last updated: Mon, 26 Oct 2026

acosh

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

acosh — Inverse hyperbolic cosine

Description

function acosh(float $num): float

Returns the inverse hyperbolic cosine of num, i.e. the value whose hyperbolic cosine is num.

Parameters

num: The value to process

Return Values

The inverse hyperbolic cosine of num

See Also

cosh() - Hyperbolic cosine
acos() - Arc cosine
asinh() - Inverse hyperbolic sine
atanh() - Inverse hyperbolic tangent

acos	asin

Math Functions	Last updated: Mon, 26 Oct 2026