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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.php
Subject: Re: Purpose for a str_replace with an embedded print_r return
Date: Tue, 04 Nov 2014 16:58:46 +0100
Organization: PointedEars Software (PES)
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Dave Patoch wrote:

[restored context]

> Christoph M. Becker wrote:
>> Dave Patoch wrote: 
>>> 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)
>>
>> What type of value does $message hold?
> 
> It's just a plain old string, which is why it confused me.

I think the proper idiom is “to kill two birds with one stone”.  This 
appears to be debug code, and if you pass “true” as second parameter to 
print_r(), it returns the output instead of printing it.

<http://php.net/print_r>

The major advantage of print_r() over echo and print(), which always output 
the *string representation* of a value, is that the type of the first 
parameter does not matter for inspection: if it is a string or a number, the 
result is a string or number; if it is an array, it contains the array keys 
and values; and if it is a reference to an object, it contains the object's 
class name and properties.  var_dump()'s output is more detailed than 
print_r()'s on the one hand, and trimmed at a point on the other, and 
highlighting can be applied to that with Xdebug; but it cannot return the 
output instead (you would have to output_buffer it yourself).

<http://php.net/echo>
<http://php.net/print>
<http://php.net/manual/en/language.oop5.magic.php#object.tostring>
<http://php.net/var_dump>
<http://xdebug.org/>

str_replace() then normalizes the value so that it can be explode()d, for 
“foreach” iteration, without using regular expressions.  This does not 
account for Mac OS < 10.x newlines ("\r"), but there does not appear to be a 
PHP release for those versions (anymore).

<http://php.net/str_replace>
<http://php.net/manual/en/install.php>


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<http://www.netmeister.org/news/learn2quote.html>

-- 
PointedEars
Zend Certified PHP Engineer
Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.