what are php array keys

Arrays in PHP are divided into index arrays and associative arrays. A key in the array corresponds to a value.

For example, the following associative array

$navs = [
    'gc'=>'国产电影',
    'om'=>'欧美电影',
];

The name of the array is $navs, gc is the key, that is, key, and its corresponding value is 'domestic movie'; similarly, om is also a key, Its value is 'European and American movies'.

PHP's array does not mean the meaning of arrays in other languages, because arrays in other strongly typed languages ​​are generally of fixed length, and subscripts are fixed numerical arrangements. The subscript (key) of PHP's array (the internal implementation is using classes) can be a number or any other scalar (number, string, etc.), and when the key of the array is a number It can also be discontinued when

. Such as 4,6,7,9, such subscripts.

$_POST $_GET are all system-default arrays

, and the value passed is a variable in it.

$_POST['Here is the value of the attribute name in the form'] // The value of this expression is the value of the attribute value in the form

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