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Doc Bug #80212 Decrement operator doesn't work as stated in the manual
Submitted: 2020-10-10 10:20 UTC Modified: 2020-10-10 10:42 UTC
From: g dot a dot stamoulis at gmail dot com Assigned:
Status: Open Package: Strings related
PHP Version: 7.4.11 OS: Linux
Private report: No CVE-ID: None
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From: g dot a dot stamoulis at gmail dot com
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 [2020-10-10 10:20 UTC] g dot a dot stamoulis at gmail dot com
Description:
------------
Strings can be incremented by the ++ operator but they don't get decremented by the -- operator. This is seems inconsistent and it is also not documented in the manual.  

Test script:
---------------
<?php
$test = 'abc12';

// increment works as expected
echo(++$test . "\n");
echo(++$test . "\n");
echo(++$test . "\n");

// decrement fails
echo(--$test . "\n");
echo(--$test . "\n");
echo(--$test . "\n");

Expected result:
----------------
abc13
abc14
abc15
abc14
abc13
abc12


Actual result:
--------------
abc13
abc14
abc15
abc15
abc15
abc15

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 [2020-10-10 10:42 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem
 [2020-10-10 10:42 UTC] cmb@php.net
The manual already states[1]:

| Note that character variables can be incremented but not
| decremented […]

Maybe this important note should be more prominent.
 
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Last updated: Wed Nov 25 20:01:23 2020 UTC