CODEWITHSUNDEEP
phparraysassociative-arraystring-parsingdelimited
Lucas
Lucas

Reputation: 3715

Parse a string with 3 delimiters and return the keys which contain a qualifying value

This is my $data variable:

cv = 1,2,3,4,5:::cpt = 4,5 ...

Now I need some function, where I can add the number as param (number will be $data number value).

for example.

function getPermission($id) {

... return $something;
}

Then if I call the function like: echo getPermission(4); it'll print out the data 'keys' where the 4 will be inside, as a value.

So, to be clear:

if I call the function like this:

echo getPermission(4); output will be "cv" and "cpt".

but if I call it this way:

echo getPermission(1);

it'll only output "cv" because number (1) is located in the cv key.

Upvotes: -1

Views: 948

Answers (2)

mickmackusa
mickmackusa

Reputation: 47864

If this task was purely about parsing the input string to a 2d arrays, you'd just need to convert the triple-colons to newlines, parse the ini string, then csv-parse the array.

var_export(
    array_map(
        'str_getcsv',
        parse_ini_string(
            str_replace(':::', "\n", $data)
        )
    )
);

But then to craft a userland function to return all keys where the passed in integer is found in the subarray would take more iterations.

If you want a direct technique to return strings which relate to number sets containing the passed in integer, then preg_match_all() can be ideal.

Match the label word, then lookahead for the whole qualifying number. Demo

define('PERMS', 'cv = 1,2,3,4,5:::cpt = 4,5:::foo = 33');

function getPermission(int $id): array {
    preg_match_all("/\w+(?= = [^:]*\b$id\b)/", PERMS, $m);
    return $m[0] ?? [];
}

// run 7 tests
var_export(
    array_map(
        'getPermission',
        range(0, 6)
    )
);

Output:

array (
  0 => 
  array (
  ),
  1 => 
  array (
    0 => 'cv',
  ),
  2 => 
  array (
    0 => 'cv',
  ),
  3 => 
  array (
    0 => 'cv',
  ),
  4 => 
  array (
    0 => 'cv',
    1 => 'cpt',
  ),
  5 => 
  array (
    0 => 'cv',
    1 => 'cpt',
  ),
  6 => 
  array (
  ),
)

Upvotes: 0

Rusty Fausak
Rusty Fausak

Reputation: 7525

$str = 'cv = 1,2,3,4,5:::cpt = 4,5';
$tmp = explode(':::', $str);
$data = array();
foreach ($tmp as $arr) {
    $tokens = explode(' = ', $arr);
    $data[$tokens[0]] = explode(',', $tokens[1]);
}

print_r(getPermission(4, $data));
print_r(getPermission(1, $data));

function getPermission($id, $data) {
    $out = array();
    foreach ($data as $key => $arr) {
        if (in_array($id, $arr)) $out[] = $key;
    }
    return $out;
}

Upvotes: 4

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