Read this article before I believe that everyone has read the PHP manual on the section of the explanation, how to understand how much? At least the first time I read the document is confused, perhaps because the translation is not easy to understand ^_^!! Here Uncletoo in accordance with their own experience, the array of various ways to create the PHP instance code to share the way to everyone, I hope to have some help (of course, PHP documents to see more)
1. Use array () to create arrays
Array () creating arrays is one of the most common ways we use PHP in the development process, and it is accurate to say that array () is a struct rather than a function.
Example 1:
Copy CodeThe code is as follows:
$number = Array (1,3,5,7,9);
$color =array ("Red", "Blue", "green");
$student = Array ("name", 17)
?>
Example 2:
Copy CodeThe code is as follows:
$language = Array (1=> "PHP",3=> "JAVA",4=> "C");
$student = Array ("name" = "Zhang San", "Age" =>17)
?>
Of course, no value in the array is allowed, that is, an empty array:
Copy CodeThe code is as follows:
$result = Array ();
?>
2. Create an array using the compact () function
The compact () function in PHP can convert one or more variables into an array
Define the format:
Array Compact (VAR1,VAR2 ...)
Example 1: Any string that has no variable name corresponding to it is skipped.
Copy CodeThe code is as follows:
$firstname = "Peter";
$lastname = "Griffin";
$age = "38";
$result = Compact ("FirstName", "LastName", "age");
Print_r ($result);
?>
Output Result:
Copy CodeThe code is as follows:
Array
(
[FirstName] = Peter
[LastName] = Griffin
[Age] = 38
)
Example 2: Using a string with no corresponding variable name, and a variable an array group
Copy CodeThe code is as follows:
$firstname = "Peter";
$lastname = "Griffin";
$age = "38";
$name = Array ("FirstName", "LastName");
$result = Compact ($name, "location", "age");
Print_r ($result);
?>
Output Result:
Copy CodeThe code is as follows:
Array
(
[FirstName] = Peter
[LastName] = Griffin
[Age] = 38
)
3. Create an array using the Array_combine () function
The Array_combine () function in PHP can combine two arrays into a new array, one of which is the key name and the value of the other array is the key value.
Define the format:
Array Array_combine (ARRAY1,ARRAY2)
Example
Copy CodeThe code is as follows:
$a 1=array ("a", "B", "C", "D");
$a 2=array ("Cat", "Dog", "Horse", "Cow");
Print_r (Array_combine ($a 1, $a 2));
?>
Output Result:
Array ([A] = Cat [b] = Dog [c] = Horse [d] = Cow)
Note: When using the Array_combine () function, two parameters must have the same number of elements.
4. Create an array using the range () function
Define the format:
Array range (FIRST,SECOND,STEP)
First: element minimum value
Second: element maximum value
Step: Element Step
Here is the official definition: The function creates an array that contains integers or characters from first to second (containing first and second). If the second is smaller than first, the inverted array is returned.
It is difficult to understand, we look directly at examples (I like to see examples of the tutorial).
Example 1:
Copy CodeThe code is as follows:
$number = range (0,5);
Print_r ($number);
?>
Output Result:
Copy CodeThe code is as follows:
Array
(
[0] = 0
[1] = 1
[2] = 2
[3] = 3
[4] = 4
[5] = 5
)
Example 2:
Copy CodeThe code is as follows:
$number = range (0,50,10);
Print_r ($number);
?>
Output Result:
Copy CodeThe code is as follows:
Array
(
[0] = 0
[1] = 10
[2] = 20
[3] = 30
[4] = 40
[5] = 50
)
Example 3:
Copy CodeThe code is as follows:
$letter = Range ("A", "D");
Print_r ($letter);
?>
Output Result:
Copy CodeThe code is as follows:
Array
(
[0] = a
[1] = b
[2] = C
[3] = d
)
5. Create an array using the Array_fill () function
The Array_fill () function fills an array with the given value class
Define the format:
Array_fill (Start,number,value)
Start: Start index
Number: Array
Value: Array value
Example:
Copy CodeThe code is as follows:
$a =array_fill (2,3, "Dog");
Print_r ($a);
?>
Output Result:
Array ([2] = dog [3] = dog [4] = dog)
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