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Request #33773 str_replace recursion
Submitted: 2005-07-19 18:14 UTC Modified: 2005-07-19 20:04 UTC
From: tomlove at gmail dot com Assigned:
Status: Closed Package: Feature/Change Request
PHP Version: 4.3.11 OS: Linux / Windows
Private report: No CVE-ID: None
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From: tomlove at gmail dot com
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 [2005-07-19 18:14 UTC] tomlove at gmail dot com
I assume this is a feature: str_replace recursively replaces when both $search and $replace are arrays.

It's too easy for this to cause runaway memory consumption though. 

I've never needed to take advantage of the recursive nature of the function, and wouldn't expect many others to.

The code below is enough to hang my system. 

Reproduce code:
for ($i = 0; $i < 50; $i++) {
  $arr1[$i] = "foo";
  $arr2[$i] = "foobarfoo";

$str = "foobar";
echo str_replace($arr1, $arr2, $str);

Expected result:

Actual result:


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 [2005-07-19 20:04 UTC] tomlove at gmail dot com
Actually, I realise it wouldn't be a trivial to change this behaviour. Probably better to leave checks for recursive cases to the script.
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