How to Round Down Decimal Values to Two Places in PHP?

Rounding Down Decimals to Two Places in PHP

Rounding down decimal values to specific places is often necessary in various programming scenarios. PHP provides several built-in methods for rounding, but achieving the desired result of rounding down can be challenging.

Number Formatting:

One common method is number_format(), which allows for formatting numerical values. However, it rounds the result to the specified precision, rather than down. For example, number_format(49.955, 2) results in "49.96" instead of the desired "49.95."

Substringing:

Another approach is substr(), which can be used to extract a specific number of characters from a string. However, this method becomes unreliable when the number is smaller (e.g., "7.950"), as it can truncate the significant digits.

Flooring Technique:

A more effective solution involves using the floor() function:

<code class="php">floor($number * 100) / 100</code>

This technique multiplies the number by 100 to shift the decimal point two places to the right. The result is then floored (rounded down to the nearest integer), effectively truncating the decimal portion. Finally, dividing the result by 100 restores the original number's scale.

For example, applying this method to "49.955" yields:

<code class="php">floor(49.955 * 100) / 100 = 49.95</code>

This approach accurately rounds the value to two decimal places while preserving the original number's sign and scale. It provides a reliable solution for rounding down decimal values in PHP.

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