Commonly used array operation functions in php (1/8)_PHP tutorial

An array is a set of elements that share certain characteristics, including similarity and type.
Each element is distinguished by a special identifier, called a key, and each key has a value
1. Two ways to create an array:
1.1 Use array() function

The code is as follows

Copy code

代码如下	复制代码
$usernames = array ('Alerk', 'Mary', 'Lucy', 'Bob', 'Jack', 'John', 'Mark' ); foreach ( $usernames as $name ) { echo $name . ' '; } ?> output Alerk Mary Lucy Bob Jack John Mark

$usernames = array ('Alerk', 'Mary', 'Lucy', 'Bob', 'Jack', 'John', 'Mark' ); foreach ( $usernames as $name )

代码如下	复制代码
$numbers = range ( 0, 10 ); foreach ( $numbers as $num ) { echo $num . ' '; } $letters = range ( 'a', 'z' ); foreach ( $letters as $letter ) { echo $letter . ' '; } ?> output 0 1 2 3 4 5 6 7 8 9 10 a c d e f g h i j k l m o q r t u v w x y z

{

echo $name . '
';
}

?>

代码如下	复制代码
//range的第三个参数表示步长 $numbers = range(1,10,2); for($i = 0;$i { echo $numbers[$i].' '; } ?> output 1 3 5 7 9

output

Alerk

Mary

Lucy Bob Jack John Mark

1.2 Use range() function

The code is as follows	Copy code
$numbers = range (0, 10); foreach ( $numbers as $num ) { echo $num . ' '; } $letters = range ( 'a', 'z' ); foreach ( $letters as $letter ) { echo $letter . ' '; } ?> output 0 1 2 3 4 5 6 7 8 9 10 a c d e f g h i j k l m o q r t u v w x y z

2. Two ways to loop through array elements: 2.1 for loop

The code is as follows	Copy code
//The third parameter of range represents the step size $numbers = range(1,10,2); for($i = 0;$i { echo $numbers[$i].' '; } ?> output 1 3 5 7 9

1 2 3 4 5 6 7 8 http://www.bkjia.com/PHPjc/629237.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629237.htmlTechArticleAn array is a group of elements that have certain common characteristics, including similarity and type. Each element is distinguished by a special identifier, called a key, and each key has a value 1. Create a number...