octdec(): decimal equivalent of octal number

<?Php
echo octdec(5); // Output 5 
echo "<br>";
echo octdec(45); // Output 37 
echo "<br>";
echo octdec(400); // Output is 256
echo "<br>";
echo octdec(657); // Output is 431
echo "<br>";
echo octdec(3000); // Output is 1536
?>

number octdec(string $octal_number);

Example: Simple Octal to Decimal Conversion

$octal = "12";
echo octdec($octal);  // Output: 10 (Octal 12 is decimal 10)

Example: Large Octal Conversion

$octal = "7654321";
echo octdec($octal);  // Output: 2054353

Example: Converting a List of Octal Values

$octal_values = ['10', '11', '12', '13'];
foreach ($octal_values as $oct) {
    echo "Octal $oct = Decimal " . octdec($oct) . "
";
}
// Output:
// Octal 10 = Decimal 8
// Octal 11 = Decimal 9
// Octal 12 = Decimal 10
// Octal 13 = Decimal 11

Example: Octal with Leading Zeros

$octal = "00077";
echo octdec($octal);  // Output: 63 (Octal 77 is decimal 63)

Example: Mixed Octal and Non-Octal Strings

$octal = "12abc34";
echo octdec($octal);  // Output: 10 (Ignores the non-octal characters)

Example: Octal to Decimal in a Function

function convertOctal($octal) {
    return octdec($octal);
}
echo convertOctal("145");  // Output: 101