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From: Matthew Carter <m@ahungry.com>
Newsgroups: comp.lang.php
Subject: Re: Purpose for a str_replace with an embedded print_r return
Date: Wed, 05 Nov 2014 15:51:52 -0500
Organization: Ahungry (http://ahungry.com)
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Jerry Stuckle <jstucklex@attglobal.net> writes:

> On 11/5/2014 10:07 AM, Denis McMahon wrote:
>> On Tue, 04 Nov 2014 06:20:24 -0800, Dave Patoch wrote:
>> 
>>> I'm cleaning up a legacy code base and I've been trying to figure out
>>> what the functional difference (other then a few cpu ticks and a bit of
>>> memory) is between:
>>>
>>> foreach(
>>>     explode("\n", str_replace("\r\n", "\n", print_r($message, true))) as
>>>     $msg)
>>>
>>> and
>>>
>>> foreach(
>>>     explode("\n", str_replace("\r\n", "\n", $message)) as $msg)
>> 
>> I've not managed to find an edge case that is handled differently by the 
>> two cases, tried feeding a mixture of single and multi line strings into 
>> the explodes and used !== to check if the resulting arrays were different.
>> 
>> #!/usr/bin/php
>> <?php
>> 
>> $test = array( 
>>     "This is a single line string",
>>     "This is a multi line string\nThis is line 2 of the string\nAnd here 
>> is line 3",
>>     "This is another multi line string\r\nThis is line 2 of the string\r
>> \nAnd here is line 3",
>>     "This is a multi line string\nWith a blank line\n\nAnd here is line 
>> 4",
>>     "This is another multi line string\r\nWith a blank line\r\n\r\nAnd 
>> here is line 4",
>> <<<EOT
>> Blah Blah Blah
>> Blah bloody blah
>> Pointy eared blah
>> EOT
>> );
>> 
>> foreach ($test as $t) {
>>     $r1 = explode("\n", str_replace("\r\n", "\n", print_r($t, true)));
>>     $r2 = explode("\n", str_replace("\r\n", "\n", $t));
>>     if ($r1 !== $r2) echo "\n\n{$t}\n\n differs\n";
>>     }
>> 
>> echo "Tests complete\n";
>> 
>> ?>
>> 
>
> Denis,
>
> You won't.  The code generates the same result in both cases because
> you're dealing with string.
>
> Now if it were a complex type such as an array or object, the results
> would differ.  But the OP already indicated it's a string, so the extra
> call to print_r() is superfluous (and confusing).

I added to the other thread, but try your tests with:

chr(980);

Under the UTF-8 character set (assuming this is coming from a
browser/over mod_php).

-- 
Matthew Carter (m@ahungry.com)
http://ahungry.com