PHP Traversal Array Statement Summary (Foreach,for,list,each) _php Tutorial

foreach to access, is the order of traversal fixed? In what order does it traverse?

Like what:

The code is as follows

$colors = Array (' Red ', ' blue ', ' green ', ' yellow ');
foreach ($colors as $color) {
Add your Codes
}
?>

Example 2

$capitals = Array ("Ohio" = "Columbus", "towa" = "Des Moines", "Arizona" and "Phoenix");
foreach ($capitals as $key = = $val) {
Add your Codes
}

while ()

while () is usually used in conjunction with list (), each ().

#example2:

The code is as follows

$colors = Array (' Red ', ' blue ', ' green ', ' yellow ');

while (list ($key, $val) = each ($colors)) {
echo "Other list of $val.
";
}
?>

Show Results:

Other list of red.
Other list of blue.
Other list of green.
Other list of yellow.

3. for ()
#example3:

The code is as follows

$arr = Array ("0" = "Zero", "1" = "One", "2" = "one");

for ($i = 0; $i < count ($arr); $i + +) {
$str = $arr [$i];
echo "The number is $str.
";
}
?>
Show Results:

The number is zero.
The number is one.
The number is a.

========= The following is a description of the function ==========

Key ()
Mixed key (array Input_array)

The key () function returns the keys element at the current pointer position in Input_array.

#example4

The code is as follows

$capitals = Array ("Ohio" = "Columbus", "towa" = "Des Moines", "Arizona" and "Phoenix");
echo "

Can you name the capitals of these states?

";
while ($key = key ($capitals)) {
echo $key. "
";
Next ($capitals);
Each key () call does not push the pointer. To do this, use the next () function
}
?>

Can you name the capitals of these states?
Ohio
Towa
Arizona

each () function iterates over an array

Example 1

The code is as follows

$people = Array ("Peter", "Joe", "Glenn", "Cleveland");
Print_r (each ($people));
?>

Output:

Array ([1] = peter [value] = peter [0] = 0 [key] = 0)

Sub 2
Each () is often used in conjunction with list () to iterate through the array. This example is similar to the previous example, but the loop outputs the entire array:

The code is as follows

Copy Code

$people = Array ("Peter", "Joe", "Glenn", "Cleveland");

Reset ($people);

while (list ($key, $val) = each ($people))
{
echo "$key and $val
";
}
?>

Output:

0 = Peter
1 = Joe
2 = Glenn
3 = Cleveland

Recursive traversal of multidimensional arrays

The code is as follows

/*
* -------------------------------------------------
* Author:
* url:www.45it.com* date:2011-03-09
* -------------------------------------------------
*/
function Arr_foreach ($arr)
{
if (!is_array ($arr))
{
return false;
}

foreach ($arr as $key = $val)
{
if (Is_array ($val))
{
Arr_foreach ($val);
}
Else
{
echo $val. '
';
}
}
}

$arr 1 = Array (1=>array (11,12,13,14=>array (141,142)), 2,3,4,5);

Echo '

';
Print_r ($arr 1);
Echo '
 
 
 Arr_foreach ($arr 1); 
? 
 
 Result 
 
 Array 
 (
 [1] = = Array 
 (
 [0] +-one 
 [1] = [2] [+] [+] = [+] [] = Array 
 (
 [0] = = 141 
 [1] = 142 
) 
 
) 
 
 [2] + 2 
 [3] + 3 
 [4] = 4 
 [5] = 5) 
 One 
 
 
 141 
 142 
 2 
 3 
 4 
 5 
 
 
 
 http://www.bkjia.com/phpjc/371384.html  www.bkjia.com  true  http://www.bkjia.com/phpjc/371384.html  techarticle  foreach to access, the order of traversal is fixed? In what order does it traverse? For example: Code as follows? PHP $colors = Array (' Red ', ' blue ', ' green ', ' yellow '); foreach ($colors as $color) {//...  
 
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