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

WBOYOriginal: 2016-07-13 17:13:05886browse

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

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

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