Implicit Conversion from Float to Int Loses Precision

Why This Happens

In PHP 8.1+, implicit float-to-int conversion that loses the fractional part triggers a deprecation notice. This catches potential bugs where precision is silently lost. Floats like 3.0 convert fine since no precision is lost, but 3.5 triggers the warning.

The Problem

$items = ['a', 'b', 'c'];
$index = 1.5;
echo $items[$index]; // Deprecated: float to int conversion

The Fix

$items = ['a', 'b', 'c'];
$index = (int) floor(1.5); // Explicitly convert
echo $items[$index];

Step-by-Step Fix

1. 1

   Find the implicit conversion

   Check the line number to find where a float is being used where an integer is expected, such as array indexes or bitwise operations.

2. 2

   Decide the conversion strategy

   Determine whether you want to round, floor, ceil, or truncate the float value.

3. 3

   Apply explicit conversion

   Use (int), intval(), floor(), ceil(), or round() to make the conversion explicit and intentional.