octdec(): decimal equivalent of octal number

$octal = '100';
echo octdec($octal); // 64

<?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
?>

int|float 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) . "<br>";
}
// 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)

Validate octal input before conversion

Invalid characters should not be passed to octdec(). In current PHP versions, relying on invalid characters being ignored is deprecated.

$octal = '127';
if (preg_match('/^[0-7]+$/', $octal)) {
    echo octdec($octal); // 87
}

Example: Octal to Decimal in a Function

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

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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