decbin():Binary equivalent of decimal number

<?Php
echo decbin(3); // Output 11 
echo "<br>";
echo decbin(35); // Output 100011 
echo "<br>";
echo decbin(100); // Output is 1100100
echo "<br>";
echo decbin(258); // Output is 100000010
echo "<br>";
echo decbin(1000); // Output is 1111101000
echo "<br>";
?>

string decbin(int $number);

Example 1: Converting Negative Numbers to Binary

<?php
echo decbin(-5);  // Output: '-101' (Two's complement is not handled by decbin)
?>

Example 2: Converting Large Decimal Numbers to Binary

<?php
echo decbin(9999999);  // Output: 100110001001011001111111
?>

Example 3: Using Binary Numbers for Bitwise Operations

<?php
$a = 5;  // 101 in binary
$b = 3;  // 11 in binary
echo decbin($a & $b);  // Output: 1 (bitwise AND)
?>

Example 4: Padding Binary Numbers with Leading Zeros

<?php
$number = 7;
echo str_pad(decbin($number), 8, '0', STR_PAD_LEFT);  // Output: 00000111
?>

Example 5: Converting Multiple Decimal Numbers in a Loop

<?php
$numbers = [2, 4, 8, 16];
foreach ($numbers as $num) {
    echo "Decimal: $num => Binary: " . decbin($num) . "<br>";
}
?>

Example 6: Converting Decimal to Binary and Back to Decimal

<?php
$decimal = 25;
$binary = decbin($decimal);
echo "Binary: $binary <br>";
echo "Back to Decimal: " . bindec($binary);  // Output: 25
?>

Example 7: Handling Binary with Different Lengths

<?php
$decimal1 = 5;  // 101 in binary
$decimal2 = 32; // 100000 in binary
echo str_pad(decbin($decimal1), 6, '0', STR_PAD_LEFT);  // Output: 000101
echo "<br>";
echo str_pad(decbin($decimal2), 6, '0', STR_PAD_LEFT);  // Output: 100000
?>

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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