Get specific content from a string

Question

I need to get numbers as an array from a given string.

Example string:

$t = '1-P,2-T,3-P,4-R,5-C,6-T,';

Expected output:

• if I search -T the output needs to be like this:

array(
    [0] => 2,
    [1] => 6
)

• if it's -P:

array(
    [0] => 1,
    [1] => 3
)

---

I tried var_export(explode("-T,",$t)); but it didn't work as expected. Can any one give me a suggestion to get this?

Answer 1

The below matches the full integer number which preceeds the search term -P.
Let's keep it concise:

$matches = array();
if (preg_match_all('/([0-9]+)\-P/', $t, $matches) >= 1) {
    var_dump($matches[1]);
}

Search for '/([0-9]+)\-P/, '/([0-9]+)\-C/, '/([0-9]+)\-T/ an so on.

---

A more dynamic way to look for different search terms/filters:

$filter = '-T';
$pattern = sprintf('/([0-9]+)%s/', preg_quote($filter));

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See preg_match_all and preg_quote functions.