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This article mainly introduces "how php removes the key value of one-dimensional array". In daily operation, I believe many people have doubts about how php removes the key value of one-dimensional array. The editor consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the question of "how php removes the key value of one-dimensional array". Next, please follow the editor to study!

In php, you can use the array_keys () function to remove the key value (value) of an one-dimensional array, leaving only the array key name (key), with the syntax format "array_keys ($array)".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, each element of an array is made up of key-value pairs (key-value), and the corresponding key value is accessed by the key name of the element.

Tip: "index" and "key name" refer to the same thing, the subscript in the form of multiple exponential groups of numbers.

Sometimes we need to remove the value of an one-dimensional array and leave only the key of the array. What should we do?

At this point, you can use the array_keys () function.

The array_key () function can get some or all of the key names in the array in the following syntax format:

Array_keys ($array [, $search_value = null [, $strict = false]])

The parameters are described as follows:

$array: required parameter, which is the array to be operated

$search_value: optional parameter. If the argument is empty, the function will return all the key names in the array. If this parameter is specified, the function will only return the key name with the value of $search_value

$strict: optional parameter to determine whether strict mode is used when searching. $strict defaults to false, that is, non-strict mode. When searching, only types are compared, not types. If $strict is set to true, strict mode, value and type are compared at the same time when searching, which is equivalent to = =.

The array_key () function returns the resulting array key name as an array.

As you can see, the key value (value) of the one-dimensional array is removed, and only the key name (key) of the one-dimensional array is returned.

At this point, the study of "how to remove the key value of an one-dimensional array by php" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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