array_key_first
Returns the first key of array if the array is not empty; NULL otherwise. Examples ¶. Example #1 Basic array_key_first() Usage. <?php $array ... , 2019 Update. Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array ..., PHP 7 >= 7.3.0 ) array_key_first — 獲得陣列的第一個鍵名（使用時注意php版本）. 說明 mixed array_key_first ( array $array ). 獲得給定陣列的第一 ...
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 array_key_first 相關參考資料
array_key_first - Manual - PHP
Returns the first key of array if the array is not empty; NULL otherwise. Examples ¶. Example #1 Basic array_key_first() Usage. <?php $array ... https://www.php.net Get first key in a (possibly) associative array? - Stack Overflow
2019 Update. Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array ... https://stackoverflow.com 【PHP 手冊>陣列函式】array_key_first，array_key_last - IT閱讀
PHP 7 >= 7.3.0 ) array_key_first — 獲得陣列的第一個鍵名（使用時注意php版本）. 說明 mixed array_key_first ( array $array ). 獲得給定陣列的第一 ... https://www.itread01.com |