Help needed searching for a string within an array of strings...

[Sims]

Hi,

Given a string $txt and an array of strings $txt_array

what would be the best/fastest way to search in _insensitive_ case if $txt
is in $text_array and, if it is, where is it?
Because I want to use the array with an ID

Something like,

$text_array[1] = "Hello A";
$text_array[2 = "Hello B";
$text_array[9] = "Hello C";
$text_array[15] = "Hello D";

and

$text = "hello c";

I want to return that it was found in text_array and that the number is '9'.
Are there any 'special' characters I need to watch out for?

Could that be done?

Regards.

Sims

[steve]

"Sims" wrote:

Hi,

Given a string $txt and an array of strings $txt_array

what would be the best/fastest way to search in _insensitive_ case if $txt
is in $text_array and, if it is, where is it?
Because I want to use the array with an ID

Something like,

$text_array[1] = "Hello A";
$text_array[2 = "Hello B";
$text_array[9] = "Hello C";
$text_array[15] = "Hello D";

and

$text = "hello c";

I want to return that it was found in text_array and that the number is ’9’.
Are there any ’special’ characters I need to watch out
for?

Could that be done?

Regards.

Sims

foreach ($text_array as $key => $value) {
if (stristr($text_ array[$key], $text)) $ret_value = $key;
}

note: stristr in (PHP 3>= 3.0.6, PHP 4 , PHP 5)

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[Sims]

>

foreach ($text_array as $key => $value) {
if (stristr($text_ array[$key], $text)) $ret_value = $key;
}

Yes, of course I know that one
But is there not any other..., better, way?

Sims

[Michael Fesser]

.oO(Sims)

foreach ($text_array as $key => $value) {
if (stristr($text_ array[$key], $text)) $ret_value = $key;
}

Yes, of course I know that one
But is there not any other..., better, way?

Not really. There are other ways, but I doubt they are better. The crux
is that you wanna search case-insensitive, this means there has to be a
call to a case-insensitive string comparing function somewhere. For
case-sensitive search you could use array_search(), but there's nothing
like array_isearch() yet.

I would simply put the above loop in a function array_isearch() (for
example) to have a fix API to use. Then you can play around with
different solutions without having to change the rest of the program.

Micha

[steve]

"Michael Fesser" wrote:

.oO(Sims)

foreach ($text_array as $key => $value) {
if (stristr($text_ array[$key], $text)) $ret_value = $key;
}
Yes, of course I know that one
But is there not any other..., better, way?

Not really. There are other ways, but I doubt they are better. The
crux
is that you wanna search case-insensitive, this means there has to

be a
call to a case-insensitive string comparing function somewhere. For
case-sensitive search you could use array_search(), but there’s
nothing
like array_isearch() yet.

I would simply put the above loop in a function array_isearch() (for example) to have a fix API to use. Then you can play around with
different solutions without having to change the rest of the program.
Micha

I have never had any performance problem with php. Most problems
relate to db access. Do you really need to squeeze php that much?

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[Christian Fersch]

Sims wrote:

foreach ($text_array as $key => $value) {
if (stristr($text_ array[$key], $text)) $ret_value = $key;
}

Yes, of course I know that one
But is there not any other..., better, way?

Yes, there is. I think array_walk will be faster and is in any case the
"correct" method.

greetings, Christian.

[Sims]

Yes, there is. I think array_walk will be faster and is in any case the
"correct" method.

Sorry but i don't think array_walk is the best method.
You cannot use it to find one string in an array, it's a callback function.

It will always loop thru all the items regardless if an item was found.
And storing the resuts is not the easiest/best way
greetings, Christian.

regards.

Sims