5 ways to create arrays in PHP

$number = array(1,3,5,7,9);
$color =array("red","blue","green");
$student = array ("name",17)
?>

Example 2:

$language = array(1=>"PHP",3=>"JAVA",4=>"C");
$student = array("name" =>"Zhang San","age"=>17)
?>

Of course, no value in the array is also allowed, that is, an empty array:

$result = array();
?>

2. Use the compact() function to create an array The compact() function in PHP can convert one or more variables into an array

Define format: array compact(var1,var2...)

Any string that does not have a corresponding variable name is ignored.

$firstname = "Peter";
$lastname = "Griffin";
$age = "38";
$result = compact("firstname", "lastname", "age ");
print_r($result);
?>

Output result: Array ( [firstname] => Peter [lastname] => Griffin [age] => 38 )

Use a string without a corresponding variable name, and an array of variable names

$firstname = "Peter";
$lastname = "Griffin";
$age = "38";
$name = array("firstname", "lastname");
 $result = compact($name, "location", "age");
print_r($result);
?>

Output result: Array ( [firstname] => Peter [lastname] => Griffin [age] => 38 )

3. Use the array_combine() function to create an array

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

Define format: array array_combine(array1,array2)

$a1=array("a","b","c","d");
$a2=array("Cat","Dog","Horse" ,"Cow");
print_r(array_combine($a1,$a2));
?>

Output result: Array ( [a] => Cat => Dog [c] => Horse [d] => Cow )

Note: When using the array_combine() function, the two parameters must have the same number of elements.

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

Define format: array range(first,second,step) first: minimum element value second: the maximum value of the element step: element step size

Official definition: This function creates an array containing integers or characters from first to second (including first and second). If second is smaller than first, return the array in reverse order.

Example 1:

$number = range(0,5);
print_r ($number);
?>

Output result: Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 )

Example 2:

$number = range(0,50,10);
print_r ($number);
?>

Output result: Array ( [0] => 0 [1] => 10 [2] => 20 [3] => 30 [4] => 40 [5] => 50 )

Example 3:

$letter = range("a","d");
print_r ($letter);
?>

Output result: Array ( [0] => a [1] => b [2] => c [3] => d )

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

The

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

Define 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 )