There are several types of PHP array definitions

1. array() function

1.1 No key value

$arr=array(1,2,3,4);

1.2 Key-value pair

　　$arr=array(
　　　'name'=>'myj',
　　　'age'=>'18',
　　　'phone'=>'1888888888'
　);

1.3 Empty array

　　$arr=array();

2. compact() function

The compact function can convert variables into arrays.

$a = 'aaa';
$b = 'bbb';
$c = 'ccc';
$arr3 = compact('a','b','c');

Output:

{"a":"aaa","b":"bbb","c":"ccc"}

3. array_combine() function

array_combine() function can combine two arrays into a new array, where One of the arrays is the key name, and the value of the other array is the key value.

$arr_key = array('a','b','c','d');
$arr_val = array('1','2','3','4');
echo var_dump(array_combine($arr_key,$arr_val));

Output:

 'a' => string '1' (length=1)
'b' => string '2' (length=1)
'c' => string '3' (length=1)
'd' => string '4' (length=1)

4. Use the array_fill() function to create an array

The array_fill() function fills the array with a given value class

Definition format:

array_fill(start,number,value)

start: starting index

number: number of arrays

value: array value

Example:

$a=array_fill(2,3,"Dog");
print_r($a);

Output result:

Array ( [2] => Dog [3] => Dog [4] => Dog )

5. Range() function

Definition format:

array range(first,second,step)

first: minimum value of element

second: maximum element value

step: element step size (default 1)

$arr = range(1,5); 输出：[1,2,3,4,5]
$arr = range(1,15,3); 输出：1,4,7,10,13

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