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Posted by Schraalhans Keukenmeester on 06/01/07 19:28
At Fri, 01 Jun 2007 19:29:46 +0300, Rami Elomaa let h(is|er) monkeys type:
> Schraalhans Keukenmeester kirjoitti:
>>> ********************************
>>> $OpenQ = mysql_query("SELECT column FROM table WHERE q_uid =
>>> $_SESSION[userid] AND status = 1",$db); // SQL query on DB returns 1
>>> result
>>
>> Rami has answered your question. I just wondered whether:
>> a) userid is a defined constant. If not, it should be in quotes.
>
> I used to think this too, but after reading the manual once again
> carefully, I discovered that this is not the case. Singlequotes in array
> keys aren't required when inside double quotes. It will not look for the
> constant, _unless_ you also use curly braces around it.
>
> $foo = "$array[key]"; // This is right, assumes key is a string
>
> $foo = "{$array[key]}"; // this assumes key is a constant, then falls
> back to string, so it'll trigger some stupid notice..
>
> $foo = "{$array['key']}"; // This again is right
>
> $foo = "$array['key']"; // quotes without curly braces is wrong, parse
> error.
>
> The thing is, if you're calling a multidimensional array, you gotta use
> the curly braces, and that forces you to use the single quotes:
> $foo = "{$array[0]['key']}";
>
> It's all here in the better book:
> http://fi.php.net/manual/en/language.types.string.php
Thanks for setting me straight Rami! Just checked and found it works the
other way around as well: if you DO use single quotes around an array
index inside a double-quoted string curly's are required, lest php throws
an error.
$arr = array('foo'=>'bar');
echo "I met my friends in the $arr[foo]";
I met my friends in the bar
echo "I met my friends in the $arr['foo']";
Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE,
expecting T_STRING or T_VARIABLE or T_NUM_STRING
echo "I met my friends in the {$arr['foo']}";
I met my friends in the bar
SOmehow I never thought about the reason why I had to em-brace
one-dimensional array references inside "strings" or heredoc, which also
expands variables of course.
I think I prefer consistent use of curly braces in these situations, and
have the same syntax with any kind of array. Personal taste & habit I
guess.
Never too old to learn.
Rgds
--
Schraalhans Keukenmeester - schraalhans@the.Spamtrapexample.nl
[Remove the lowercase part of Spamtrap to send me a message]
"strcmp('apples','oranges') < 0"
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