How PHP's indexed arrays and associative arrays are used

This time for you to bring PHP index array and associative array how to use, using PHP indexed array and associative array of considerations, the following is the actual case, together to see.

An indexed array in PHP refers to an array of numbers as keys. And this key value is self-increasing.

An associative array refers to a value that corresponds to a key value, and this key value is irregular and is usually specified by us.

They also have different places, and the indexed array is converted to JSON after the array. When the associative array is converted to JSON, it is the object. Usually we give the app-side write interface to use the indexed array to transfer to JSON pass through. The client side is a bit more friendly to the array.

Points to note:

$arr = [0=>1,2=>3a];

The above array $arr to JSON will be in the form of an object.

$arr = [' A ', ' B '];

Here the $arr is converted to JSON after the form of an array

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