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This article mainly introduces whether the array of php only supports digital subscript, which can be used for reference by interested friends. I hope you can learn a lot after reading this article.

No, the subscript (index value) of the php array can be a string or a number. An array with a subscript of a string is an associative array, which is an array with a special index; an array with a subscript of a number is an indexed array, whose subscript value must be an integer, starting with 0, and so on.

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

In PHP, the subscript (index value) of an array can be a string or a number.

An array subscribed to a string is an associative array

An array with a subscript of numbers is an indexed array

Indexed array

The indexed array stores a series of organized single or multiple values, each of which can be accessed by using an unsigned integer value. The key of the indexed array is an integer, starting at 0, and so on.

Associative array

An associative array is an array with a special index. Use a string or other type of value (except NULL) to index it.

In fact, the difference between an associative array and an indexed array is only in the key value, the key value of the associative array is a string and is artificially specified.

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