php - finding keys in an array that match a pattern
you can simply loop through the array and check the keys
$array = array(...your values...);
foreach($array as $key => $value) {
if (preg_match($pattern,$key)){
// it matches
}
}
You can wrap it in a function and pass your pattern as parameter
Old question, but here's what I like to do:
$array = [ '2.5' => 'ABDE', '4.8' => 'Some other value' ];
preg_grep
+ array_keys
will find all keys
$keys = preg_grep( '/^2\.\d/i', array_keys( $array ) );
You can add array_intersect_key
and array_flip
to extract a slice of the array that matches the pattern
$vals = array_intersect_key( $array, array_flip( preg_grep( '/^2\.\d/i', array_keys( $array ) ) ) );
For future programmers who encounter the same issue. Here is a more complete solution which doesn't use any loops.
$array = ['2.5'=> 'ABCDE', '2.9'=>'QWERTY'];
$keys = array_keys($array);
$matchingKeys = preg_grep('/^2\.+/', $keys);
$filteredArray = array_intersect_key($array, array_flip($matchingKeys));
print_r($filteredArray);
I think you need something like this:
$keys = array_keys($array);
$result = preg_grep($pattern, $keys);
The result will be a array that holds all the keys that match the regex. The keys can be used to retrieve the corresponding value.
Have a look at the preg_grep function.