Dividend result with leading zero is 2.5 instead of 3. Why?

Question

Why the following code displays 2.5 instead of 3:

$a = 012;
echo $a / 4;

score 2 · Accepted Answer · answered Feb 23 '17 at 20:34

Your variable is being interpreted as an octal. Per the docs:

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.

Read more: http://php.net/manual/en/language.types.integer.php

score 1 · Answer 2 · answered Feb 23 '17 at 20:34

1

Starting a number with 0 like that means octal (base 8). So octal 12 = decimal 10.

answered Feb 23 '17 at 20:34

Chris Rowles

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Dividend result with leading zero is 2.5 instead of 3. Why?

2 Answers2