On Sat, June 2, 2007 3:15 pm, Brian Seymour wrote:
> $bar = $foo['$colVal']; // didn't work
> $bar = $foo['{$colVal}']; // didn't work
> $bar = $foo[$colVal]; // worked
> $bar = $foo['id']; // obviously worked
>
> What I don't understand is why the first or second option didn't work.
>
> Can anybody shed some light on this?
' is actually easier to explain.
' has only TWO special characters you can embed in it: ' and \
$foo = 'That\'s life!';
$bar = 'The backslash \\ should be escaped, because it\'s special';
You don't HAVE to escape \ with \\ if PHP won't get "confused" by
whatever else you have in your string, but it's a Good Idea, imho, to
just always escape it, so you understand what the string parser is
doing internally.
" is a bit more complex.
In addition to " and \ being special, exactly parallel to ' and \
inside '', you also have:
variables like $foo and 1-D arrays like $foo[id]
special control characters like \n \t \r
any char you want with octal
{ and } for some versions (ugh) of PHP
There is also heredoc syntax, which is probably best for large chunks
of text, in general.
Full documentation is here:
http://us.php.net/manual/en/language.types.string.php
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