Arrays: $SomeArray{0} vs. $SomeArray[0]

[Ira Gladnick]

I have found that in PHP 5, <?php $SomeArray{0} = $somevalue ?(note
the squigly braces) appears to be functionally equivalent to the more
usual <?php $SomeArray[0] = $somevalue ?(square array brackets).

However, doing $SomeArray{} = $somevalue raises an error.

I can't seem to find any documentation that indicates why you can use
squigly braces in the case where an array index is provided. Was
wondering if someone could explain why they work in that situation, and
possibly provide a reference to this use of squigly braces in the PHP 5
documentation.

(I am a rank PHP newbie, for whatever that's worth..)

[Norman Peelman]

"Ira Gladnick" <Ir*********@yahoo.comwrote in message
news:11**********************@n67g2000cwd.googlegr oups.com...

I have found that in PHP 5, <?php $SomeArray{0} = $somevalue ?(note
the squigly braces) appears to be functionally equivalent to the more
usual <?php $SomeArray[0] = $somevalue ?(square array brackets).

However, doing $SomeArray{} = $somevalue raises an error.

I can't seem to find any documentation that indicates why you can use
squigly braces in the case where an array index is provided. Was
wondering if someone could explain why they work in that situation, and
possibly provide a reference to this use of squigly braces in the PHP 5
documentation.

(I am a rank PHP newbie, for whatever that's worth..)

You use [ ] on arrays such as:

$someArray[0] = "0123456789";
$someArray[1] = "rock 'n roll";

echo $someArray[0] will output:
0123456789

echo $someArray[1] will output:
rock 'n roll

You use { } on strings such as:

$someString1 = "0123456789";
$someString2 = "rock 'n roll";

echo $someString1{5} will output:
5

echo $someString2{3} will output:
k

strings are zero based... with this method you can manipulate strings at the
character level if you want.

Norm
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[Michael Fesser]

..oO(Norman Peelman)

>You use [ ] on arrays such as:
[...]

You use { } on strings such as:
[...]

You can also use [] on strings, even if it was not recommended in older
PHP versions. The {} syntax is now deprecated as of PHP 5.1 and will be
removed in PHP 6.

4.5 Cleanup for {} vs. []
http://www.php.net/~derick/meeting-n...cleanup-for-vs

Micha

[Ira Gladnick]

Norman Peelman wrote:

You use { } on strings such as:

$someString1 = "0123456789";
$someString2 = "rock 'n roll";

echo $someString1{5} will output:
5

Interesting.

But I was actually doing an assignment using the brace notation:
SomeArray{0} = $somevalue

And, when I did a print_r($SomeArray), it displayed as being an array
with the zero element being the assigned value (if I change the
assignment to SomeArray{99} = $somevalue, then it shows the 99th array
element as holding $somevalue).

So in this situation it seems that braces are equivalent to array
brackets, and are doing something different than string indexing. But
as mentioned, I can't seem to find any documentation indicating this
usage.

This kind of brace usage came up in the context of a certification
practice exam.

[David]

Thats exactly what I mean. every tutorial, book seems to indicate different
things.
"Ira Gladnick" <Ir*********@yahoo.comwrote in message
news:11**********************@l12g2000cwl.googlegr oups.com...

>
Norman Peelman wrote:

>You use { } on strings such as:

$someString1 = "0123456789";
$someString2 = "rock 'n roll";

echo $someString1{5} will output:
5

Interesting.

But I was actually doing an assignment using the brace notation:
SomeArray{0} = $somevalue

And, when I did a print_r($SomeArray), it displayed as being an array
with the zero element being the assigned value (if I change the
assignment to SomeArray{99} = $somevalue, then it shows the 99th array
element as holding $somevalue).

So in this situation it seems that braces are equivalent to array
brackets, and are doing something different than string indexing. But
as mentioned, I can't seem to find any documentation indicating this
usage.

This kind of brace usage came up in the context of a certification
practice exam.

[Jerry Stuckle]

Ira Gladnick wrote:

Norman Peelman wrote:

>>You use { } on strings such as:

$someString1 = "0123456789";
$someString2 = "rock 'n roll";

echo $someString1{5} will output:
5

Interesting.

But I was actually doing an assignment using the brace notation:
SomeArray{0} = $somevalue

And, when I did a print_r($SomeArray), it displayed as being an array
with the zero element being the assigned value (if I change the
assignment to SomeArray{99} = $somevalue, then it shows the 99th array
element as holding $somevalue).

So in this situation it seems that braces are equivalent to array
brackets, and are doing something different than string indexing. But
as mentioned, I can't seem to find any documentation indicating this
usage.

This kind of brace usage came up in the context of a certification
practice exam.

I don't think this was ever legal for arrays - just something which
wasn't properly caught. At least I've never seen this syntax for arrays
in any of the official PHP doc.
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