NYCPHP Meetup

[Anirudh Zala]

On Tuesday 03 April 2007 06:46, David Krings wrote:
> Hi!
>
> The old topic is at it again. After some long long time I started again
> with doing some PHP. Task: internationalize my existing project. Goal:
> read strings from a text file. First step: open the file.
>
> I used this:
> $langfile = fopen('$langfileloc', 'r');
> and constantly had it fail. The path and file name are OK, I
> quadruplechecked.
>
> Now, when I do this:
> $langfile = fopen("$langfileloc", "r");
> It works like a charm. Which makes me wonder as some long time ago we
> had this nice discussion that ended with sth like "one needs only the
> single quote for everything in PHP".
>
> Do I recall this incorrectly or are the exceptions (bugs?) in PHP?
>
> Well, took me quite some time to figure out that my use of expert advise
> wasn't that great this time around.
>
> David
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Please remember below rules while writing PHP expressions.

#1 There is practically NO use of "double quotes" in PHP in writing 
expressions EXCEPT expanding sequences like converting "\n" into newline, 
"\t" to tabulator (in regex etc.). Which means you should not use "double 
quotes" at any other place than above.

#2 When your data is static, use 'single quotes' to tell PHP to use it "as it 
is", if dynamic then should not be enclosed by ANY quote.

#3 If you have mixture of static+dynamic then use $dynamic.'I am static' style 
to concat dynamic and static data.

When you use "double quotes" PHP will try to EXPAND everything which is 
enclosed in "double quotes" which means variables will be expanded, static 
string will be looked for constants first and if not found then will be used 
as it is and then finally expression will be prepared.

Hope these will clear your thoughts about '' vs. "" quotes.

Anirudh Zala