How to Use PHP’s is_finite() to Validate Finite Float Values
This guide explains PHP’s is_finite() function, its purpose, accepted parameter, return behavior, and provides a clear code example showing how to determine whether a floating‑point number is a finite value on the current platform.
Purpose of is_finite()
The is_finite() function checks whether a given value is a legal, finite floating‑point number within the range allowed by the host platform’s PHP implementation.
Signature
bool is_finite(float $val)Parameters
$val – The value to be examined.
Return Value
Returns TRUE if $val is a finite float; otherwise returns FALSE (e.g., for INF, -INF, or NaN).
Example Usage
<?php
echo is_finite(2); // 1 (TRUE)
echo is_finite(log(0)); // 0 (FALSE) – log(0) yields -INF
echo is_finite(2000); // 1 (TRUE)
?>Expected Output
1
1The first and third calls return 1 because the arguments are finite numbers, while the second call returns 0 because log(0) produces an infinite value.
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