One of php array learning

php array learning
Array: a collection of keywords and values. The same php array can store values ​​of multiple different data types. The array subscript starts from zero
Several ways to create an array:
(1)

Php code

$arr[0]=1;//Array element

$arr[1]=2.8;

......

(2)

Php code

$arr = array(1, 2.8,"str",....);

(3)

Php code

//You can specify the subscript of the array element yourself

$arr = array("dizhi"=>"beijing ",..)//Use array("key"=>"value")