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The subscript of the php array defaults to the integer type and starts at 0. In php, if you do not manually set the string key name (subscript) when creating an array, an indexed array is created by default, where the subscript (key name) consists of integer values, and the default index value is incremented from 0; each number corresponds to the position of an array element in the array, which does not need to be specified.

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

There are two ways to declare an array in PHP:

You can declare an array by directly assigning values to array elements

Declare the array using the array () function.

However, either way, if the string key name (subscript) is not manually set when creating the array, the indexed array is created by default

The subscript (key name) of the indexed array consists of integer values, and by default, starting from 0, each number corresponds to the position of an array element in the array, which does not need to be specified. PHP automatically assigns an integer value to the key name of the indexed array, and then increments automatically from this value.

The associative array is set only if you specify the string key name manually:

The key name of an associative array can be any integer or string. If the key name is a string, add a delimiter to the key name-single quotation mark''or double quotation mark "". For indexed arrays, to avoid confusion, it is best to add delimiters as well.

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