How to output the primary key name of a two-dimensional array in PHP

How to output the primary key name of a two-dimensional array in php:

The first step is to double-click to run the phpstudy software.

Step 2: Create a php file 01.php in the js folder under the www folder in the phpstudy installation directory.

Step 3: Use the editor sublime text to open the file 01.php, and set the encoding format of the file to utf-8

Step 4: Enter the php code to create a two-dimensional array $place.

The fifth step is to use the foreach statement to traverse and output the primary key name of the two-dimensional array.

The sixth step is to open the browser and enter "localhost/js/01.php" in the address bar to check the code running effect. If the primary key name of the two-dimensional array is displayed and output, it means that the code runs successfully.

#In the seventh step, you can also use the foreach statement to traverse and output the values ​​of the two-dimensional array.

The eighth step is to open the browser and enter "localhost/js/01.php" in the address bar to check the code running effect. It not only prints out the primary key name of the two-dimensional array, but also outputs the value of the two-dimensional array.

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