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Bug #26292 substr returns "0" for any offset on the string "0"
Submitted: 2003-11-17 17:16 UTC Modified: 2003-11-17 17:54 UTC
From: ravacholp at hotmail dot com Assigned:
Status: Not a bug Package: Strings related
PHP Version: 4.3.2 OS: windows 2000
Private report: No CVE-ID: None
View Developer Edit
 [2003-11-17 17:16 UTC] ravacholp at hotmail dot com 
Description:
------------
substr() returns "0" for any offset on the string "0" using the length 1.

This causes an infinite loop if you are checking for leading zeros in your string using substr().

Reproduce code:
---------------
$str = "0";

print (substr($str, 0, 1) == "0");
print (substr($str, 1, 1) == "0");

print (substr($str, 5, 1) == "0");

// only the first line should evaluate to true

Expected result:
----------------
111

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 [2003-11-17 17:54 UTC] sniper@php.net 
With a more reliable test script:

# cat t.php 
<?php
$str = "0";
var_dump(substr($str, 0, 1));
var_dump(substr($str, 1, 1));
var_dump(substr($str, 5, 1));
?>

# php t.php 
string(1) "0"
bool(false)
bool(false)

No bug here.
 
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