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This article mainly introduces how php queries the key of array elements, which has certain reference value. Interested friends can refer to it. I hope you will have a lot of gains after reading this article. Let Xiaobian take you to understand it together.

In PHP, you can use the key() function to query the key of an array element. This function is used to return the key name of the element currently pointed to by the pointer inside the array. If an error occurs, the result returned is FALSE, and the syntax is "key(specified array)".

Operating environment: Windows 10 system, PHP 7.1 version, Dell G3 computer.

PHP How to query array element key

The key() function returns the key name of the element currently pointed to by the pointer inside the array.

If an error occurs, the function returns FALSE.

The key() function is used to obtain the key name of the current element in the array.

Inside each PHP array there is a pointer that points to an element of the array, and the element pointed to is the "current element." The current() function returns the current element of an array.

The syntax is:

key(array)

Examples are as follows:

The results of the above procedures are:

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