What are some common mistakes to avoid when working with floating-point numbers in PHP?

One common mistake to avoid when working with floating-point numbers in PHP is relying on equality comparisons due to the inherent precision limitations of floating-point arithmetic. Instead, it is recommended to use functions like `round()` or `number_format()` to handle rounding and formatting of floating-point numbers. 

// Incorrect way to compare floating-point numbers
$number1 = 0.1 + 0.2;
$number2 = 0.3;
if ($number1 == $number2) {
    echo "Numbers are equal";
} else {
    echo "Numbers are not equal";
}

// Correct way to compare floating-point numbers
$number1 = 0.1 + 0.2;
$number2 = 0.3;
if (abs($number1 - $number2) < 0.0001) {
    echo "Numbers are approximately equal";
} else {
    echo "Numbers are not equal";
}

Keywords

floating-point numbers precision rounding errors type juggling IEEE 754 standard

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