在php中按小数点分割数字

<?php
$number = 123.456;
$number_string = (string)$number;
$number_parts = explode('.', $number_string);

echo "整数部分: " . $number_parts[0] . "\n";
echo "小数部分: " . $number_parts[1] . "\n";
?>

整数部分: 123
小数部分: 456