PHP Array Tutorial Defining Arrays_PHP Tutorial

1. Define an array
You can use the array() language structure to create a new array. It accepts a number of comma-separated key => value parameter pairs.
array( [key =>] value , ... ) // key can be a number or a string // value can be any value
Example 1:

Copy code The code is as follows:

$phpjc = array(
0=>'word',
3=> ;'excel',
'outlook',
'access');
print_r($phpjc);
?>

The output results are as follows:
Array ( [0] => word [3] => excel [4] => outlook [5] => access )
Example 1 defines an array named phpjc, the first element The value is: word, (note: the array starts counting from 0), the second element is empty, the third element is: excel, and the fourth and fifth elements
are automatically generated later and can be passed to the variable Giving array() no arguments creates an empty array, to which values ​​can then be added using the square brackets [] syntax.
Example 2:

Copy code The code is as follows:

$phpjc = array();
$phpjc [] = "one";
$phpjc[] = "two";
echo $phpjc[0]."
";
echo $phpjc[1];

The output results are as follows:
one
two
2. Read array elements
Use string index (or key) to access the value stored in the array
Example 3 :

Copy code The code is as follows:

$phpjc = array("first"=>1,"second"= >2,"third"=>3);
echo $phpjc["second"];
$phpjc["third"]=5; //Change the value of the third element from "3 "Changed to "5"
echo $phpjc["third"];

http://www.bkjia.com/PHPjc/320749.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/320749.htmlTechArticle1. Define an array You can use the array() language structure to create a new array. It accepts a number of comma-separated key = value parameter pairs. array( [key =] value , ... ) // key can be...