| Re: Using count() as an array index [message #178434 is a reply to message #178422] |
Mon, 18 June 2012 07:46   |
Arno Welzel
Messages: 317
Registered: October 2011
Karma:
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Senior Member |
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Jerry Stuckle, 16.06.2012 20:44:
> On 6/16/2012 1:56 PM, Martin Leese wrote:
>> Chuck Anderson wrote:
>>
>>> You can not use a function call within a quoted string.
>>>
>>> You should use:
>>>
>>> echo $anArray[count($array)] . "\n";
>>
>> Thank you. I actually understood this
>> explanation.
>>
>
> Actually, you can easily use a function call within a quoted string, but
> since it is not a simple variable, you need to use curly braces, i.e.
>
> <?php
> $anArray[1] = "This is element one";
> $anArray[2] = "This is element two";
> $anArray[3] = "This is the last element";
> echo "{$anArray[count($anArray)]}\n";
> ?>
>
> prints "This is the last element" (without the quotes, of course).
Please compare:
$anArray[count($array)] . "\n";
"{$anArray[count($anArray)]}\n";
You see the difference? Your suggestion is longer (even whitespaces
which can me omitted) and totally unreadable for people you are not
familiar with this.
> Be aware, though - the typical array in PHP starts counting at 0, not 1.
> So an array of 3 elements would be numbered 0, 1 and 2. In this case,
> an element with an index of 3 (count($anArray)) is not set (and will
> give a warning if you try to use it).
ACK.
> You need to get used to this idea; it's used throughout PHP.
Just because something is possible does not mean you have to use it ;-)
Curly braces should only be used for code blocks and not to replace
string concatenation.
--
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de
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