PHP array slicing preserves key names

By specifying the fourth parameter preserve_keys as true, the array_slice() function can preserve the key names of PHP associative array slices: Preserve key names: Specify preserve_keys as true. Syntax: array_slice(array, offset, length, preserve_keys). Practical case: Use an example to show how to retain the key names of associative array slices.

PHP array slice that retains the key name

PHP array slice functionarray_slice() will be reset by default Program key names. However, we can preserve the key names by specifying the fourth parameter preserve_keys as true.

Grammar:

array_slice(array $array, int $offset, int $length, bool $preserve_keys = FALSE)

Practical case:

Suppose we have a file named $fruits An associative array where the key is the name of the fruit and the value is the number of fruits. We want to get a slice of two elements starting at index 1 while retaining the key names:

$fruits = array('apple' => 2, 'banana' => 3, 'orange' => 5, 'pear' => 1);

$slice = array_slice($fruits, 1, 2, true);

print_r($slice);

Output:

Array
(
    [banana] => 3
    [orange] => 5
)

As we can see, the $slice array retains The key name of the original array.

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