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PHP 7.3

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php中文网 Courses

Jun 11, 2025 · Backend Development

How to Retrieve the First Key of an Array in PHP with array_key_first()

Learn how to use PHP's array_key_first() function introduced in PHP 7.3 to obtain the first key of an array, see syntax, example code, handling empty arrays, and fallback to array_keys() for older PHP versions.

FunctionsPHPPHP 7.3

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How to Retrieve the First Key of an Array in PHP with array_key_first()

php中文网 Courses

Aug 20, 2024 · Backend Development

Using PHP’s array_key_first() Function to Retrieve the First Array Key

Introduced in PHP 7.3, the array_key_first() function returns the first key of an array, with examples showing its usage, handling of empty arrays, and an alternative approach using array_keys() for older PHP versions.

PHPPHP 7.3array-functions

0 likes · 3 min read

Using PHP’s array_key_first() Function to Retrieve the First Array Key