How to get value in php array

PHP array

Features: It can store any type of data, it can be discontinuous, it can be indexed or associated

What is an index?

is the common array style. The index starts from 0, 1, 2, 3. To define an array, you put values ​​directly into it, and only the index is automatically generated, so it usually starts from 0, like this The array is an indexed array, and the indexes are consecutive. (Recommended learning: PHP programming from entry to proficiency)

What is association?

is our hash table set. When defining it, it must be given a key and a value. The two are related, and the values ​​corresponding to the key are related.

Define an array

The first way to define an array:

Define simply index the array

$a = array(1,2,3);

Define the first of the array Two ways:

Assignment definition

$a[] =1;
$a[] =2;
$a[] =3;

The third way to define an array:

Define an associative array

$a = array(
"one"=>"hello",
"two"=>100,
"three"=>9.9
);

Array value

Get the value based on the index array:

$a = array(1,2,3);
echo $a[0];

Get the value based on the key Value:

$a = array(
"one"=>"hello",
"two"=>100,
"three"=>9.9
);
echo $a["three"];

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