get a string within a string - php

Question

I have a string:

[gallery ids="2282,2301,2302,2304,2283,2303,2285,459,1263,469,471,1262,1261,472,608,467,607,606,466,460"]

The ids will vary, but how can I (in PHP) get the values?

RegExps are not my strong point but I guess we could check for everything within the quotes that comes directly after the word ids?

How about strpos + substr instead?

zerkms
– zerkms

2013-03-04 23:50:07 +00:00
Commented Mar 4, 2013 at 23:50 — zerkms
– zerkms, Commented Mar 4, 2013 at 23:50

CSᵠ · Accepted Answer · 2013-03-04 23:51:08Z

5

Regex: preg_match_all(/\d+/,$string,$matches);

Explained demo here: http://regex101.com/r/fE4fE6

answered Mar 4, 2013 at 23:51

CSᵠ

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Michael · Accepted Answer · 2013-03-05 00:31:43Z

2

I think a simpler solution, rather than using preg_match, is to simply explode the string using " as the delimiter, where the ids will be the second element (index 1).

$string = '[gallery ids="2282,2301,2302,2304,2283,2303,2285,459,1263,469,471,1262,1261,472,608,467,607,606,466,460"]';

$array = explode('"', $string);

$ids = explode(',', $array[1]);

This can be quite elegant from PHP 5.4 where function array dereferencing has been added:

$string = '[gallery ids="2282,2301,2302,2304,2283,2303,2285,459,1263,469,471,1262,1261,472,608,467,607,606,466,460"]';

$ids = explode(',', explode('"', $string)[1]);

The benefit this has over preg_match is that it doesn't matter what the values are -- they could be numbers or letters or other symbols.

edited Mar 5, 2013 at 0:31

answered Mar 4, 2013 at 23:59

Michael

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2 Comments

Michael Ozeryansky Over a year ago

good answer, but preg_match can match anything. It just might be overkill for this simple task.

Michael Over a year ago

True, but you'd need to know what the pattern is for the values. With explode you don't, so it's more extensible.

Supericy · Accepted Answer · 2013-03-04 23:54:17Z

0

If you wanted a non-regex solution, you could do something like this:

$str = ...;

$start = strpos($str, '"') + 1; // find opening quotation mark
$end = strpos($str, '"', $start); // find closing   ''     ''

$ids = explode(",", substr($str, $start, $end - $start));

answered Mar 4, 2013 at 23:54

Supericy

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