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This article mainly introduces how to get the first or last key of the array in PHP7. It is very detailed and has certain reference value. If you are interested, you must read it.

The first / last key of the array (PHP 7.3)

Starting with PHP 7.3, you can easily get the first and last keys of an array:

$array = ['v' = > 1,'i' = > 2,'p' = > 3]; $firstKey = array_key_first ($array); $lastKey = array_key_last ($array); print_r ($firstKey); / / vprint_r ($lastKey); / / p

It's really simple because it doesn't affect internal array pointers.

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