array_find

(PHP 8 >= 8.4.0)

array_find — Returns the first element satisfying a callback function

Descrizione

array_find(array $array, callable $callback): mixed

array_find() returns the value of the first element of an array for which the given callback returns true. If no matching element is found the function returns null.

Elenco dei parametri

array

The array that should be searched.

callback

The callback function to call to check each element, which must be

callback(mixed $value, mixed $key): bool

If this function returns true, the value is returned from array_find() and the callback will not be called for further elements.

Valori restituiti

The function returns the value of the first element for which the callback returns true. If no matching element is found the function returns null.

Esempi

Example #1 array_find() example

<?php
$array = [
    'a' => 'dog',
    'b' => 'cat',
    'c' => 'cow',
    'd' => 'duck',
    'e' => 'goose',
    'f' => 'elephant'
];

// Find the first animal with a name longer than 4 characters.
var_dump(array_find($array, function (string $value) {
    return strlen($value) > 4;
}));

// Find the first animal whose name begins with f.
var_dump(array_find($array, function (string $value) {
    return str_starts_with($value, 'f');
}));

// Find the first animal where the array key is the first symbol of the animal.
var_dump(array_find($array, function (string $value, $key) {
   return $value[0] === $key;
}));

// Find the first animal where the array key matching a RegEx.
var_dump(array_find($array, function ($value, $key) {
   return preg_match('/^([a-f])$/', $key);
}));
?>

Il precedente esempio visualizzerà:

string(5) "goose"
NULL
string(3) "cow"
string(3) "dog"

Vedere anche:

array_find_key() - Returns the key of the first element satisfying a callback function
array_all() - Checks if all array elements satisfy a callback function
array_any() - Checks if at least one array element satisfies a callback function
array_filter() - Filtra gli elementi di un array usando una funzione callback
array_reduce() - Riduce iterativamente l'array a un singolo valore utilizzando una funzione callback

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