PHP: Get array values of a string array that match substrings of another string array

Question

There are two arrays:

$strings = array('Apple', 'Banana', 'Orange');
$substrings = array('pp', 'range');

I want to get an array which contains all the strings, that match the substrings:

Array
(
    [0] => Apple
    [2] => Orange
)

Or with new indices:

Array
(
    [0] => Apple
    [1] => Orange
)

@jeroen everyone is keen to jump on low hanging fruit like this. Gotta get them rep points! — Sammitch, Dec 07 '12 at 17:19
**See also:** https://stackoverflow.com/questions/12543361/php-array-function-that-returns-a-subset-for-given-keys — dreftymac, Aug 24 '19 at 22:53

score 5 · Accepted Answer · answered Dec 07 '12 at 16:24

5

A simple solution that comes to mind: combine array_filter and strpos;

$strings = array('Apple', 'Banana', 'Orange');
$substrings = array('pp', 'range');

$result = array_filter($strings, function($item) use($substrings) {
  foreach($substrings as $substring)
    if(strpos($item, $substring) !== FALSE) return TRUE;
  return FALSE;
});

To reset indices, you can use the array_values function.

answered Dec 07 '12 at 16:24

knittl

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I don't really understand the "function($item) use($substrings)" part, but it works fine. Thank you! – Ben Dec 07 '12 at 16:45
@Ben: It's a [anonymous function/closure](http://php.net/closures) – knittl Dec 07 '12 at 16:51

score 1 · Answer 2 · answered Dec 07 '12 at 16:24

$strings = array('Apple', 'Banana', 'Orange');
$substrings = array('pp', 'range');
$newarray = array();

foreach ($strings as $string) {
    foreach ($substrings as $substring) {
        if (strstr($string, $substring)) {
            array_push($newarray, $string);
        }
    }
}

in $newarray you have the result

Paul · Answer 3 · 2012-12-07T16:29:56.540

0

You can use array_filter for this:

$strings = array('Apple', 'Banana', 'Orange');
$substrings = array('pp', 'range');

$result = array_filter($strings, function($string) use ($substrings){
    foreach($substrings as $substring)
        if(strstr($string, $substring) !== false)
            return true;
    return false;
});

// $result is the result you want.

edited Dec 07 '12 at 16:29

answered Dec 07 '12 at 16:24

Paul

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Be careful, `strstr` might return the string `"0"` which is considered false-y – knittl Dec 07 '12 at 16:25
@knittl Ah, didn't consider the case where a substring might be "0". Thanks, I fixed it. – Paul Dec 07 '12 at 16:27

score 0 · Answer 4 · answered Dec 07 '12 at 16:24

0

try array_search. looked at the second note at the bottom of this page http://php.net/manual/en/function.array-search.php for an example.

answered Dec 07 '12 at 16:24

Colby Guyer

594
3
14

score 0 · Answer 5 · answered Dec 07 '12 at 16:28

0

$arr=array();
foreach($substrings as $item)
{
    $result=array_keys($strings,$item);
    if ($result)
    {
        $arr=array_merge($arr,$result);
    }
}

answered Dec 07 '12 at 16:28

Mert Emir

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1
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20

This would work for matching the whole of a string, but not for partial matches such as 'pp' and 'rang' as was mentioned. – RobMasters Dec 07 '12 at 16:31

PHP: Get array values of a string array that match substrings of another string array

5 Answers5

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