CODEWITHSUNDEEP
php
kimbarcelona
kimbarcelona

Reputation: 1136

Echo integer with 0

Hi I'm wondering for the following output:

<?php 
echo 0500; // Output: 320
echo "<br>";
echo 500; //Output: 500
?>

Any little explanation about this?

Upvotes: 2

Views: 947

Answers (1)

Sharanya Dutta
Sharanya Dutta

Reputation: 4021

PHP renders any integer starting with a 0 (zero) as an octal (base 8) integer. If you echo it, however, you will get its decimal value. The page for Integers in the PHP manual says:

Integers can be specified in decimal (base 10), hexadecimal (base 16), octal (base 8) or binary (base 2) notation, optionally preceded by a sign (- or +).

Binary integer literals are available since PHP 5.4.0.

To use octal notation, precede the number with a 0 (zero). To use hexadecimal notation precede the number with 0x. To use binary notation precede the number with 0b.

UPDATE: It may or may not be a sweet formula, but Wikipedia recommends this one for the octal to decimal conversion:

In this formula, ai is an individual octal digit being converted, where i is the position of the digit (counting from 0 for the right-most digit).

Let’s convert 37368 to decimal:

37368 = (3×83)+(7×82)+(3×81)+(6×80) = 1536+448+24+6 = 201410

Upvotes: 7

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