array_key_first — Gets the first key of an array
时间:2020-05-11 19:27:54
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说明
array_key_first ( array
$array ) : mixedGet the first key of the given array without affecting the internal array pointer.https://www.bzddrive.com/
参数
array-
An array.
返回值
Returns the first key of array if the array is not empty; NULL otherwise.
原文:https://www.cnblogs.com/furuihua/p/12870162.html
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