“数组项”和常量“定义”仅显示0而不是整数

Question

I declared an array item "0859" but when I display the array item, it shows only the 0 and not the whole number "0859".

In constant define I set the value to "01238" the result is the same with my array, it shows only the value 0 and not the whole number 01238. I would like to know further about the reason why array item and define that starts with 0 in there item and values shows only the 0 and not the whole number

Array

<?php
  $num = [0859];
  echo $num;

  output: 0

  Why not the the output is "0859"
?>

Constant Define

<?php

  define(myNum, 01238);
  echo myNum;

  output: 0

  Why not the the output is "01238"

?>

I'm using Wamp PHP version 5.5.12

Please enlighten me why I get the output only 0 and not the whole number

Answer 1

If you're running PHP7 you should probably take a look at this answer.

As said in the linked answer:

This comes from the changes made to how integers, specifically octals, are handled in PHP7 (as oppsoed to PHP5).

Invalid octal literals

Previously, octal literals that contained invalid numbers were silently truncated (0128 was taken as 012). Now, an invalid octal literal will cause a parse error.

Either use them as strings, or actual integers

$a = array(1, 8, 9, 12); // Integers

$a = array("00001", "00008", "00009", "00012"); // Strings

You can find more info on Integers/Octals here: http://php.net/manual/en/language.types.integer.php