There are two ways to use foreach ():
Copy CodeThe code is as follows:
foreach (Array_Name as $value)
{
Statement
}
The array_name here is the name of the array you want to traverse, each time the value of the current element of the Array_Name array is assigned to $value, and the subscript inside the array moves down one step, that is, the next loop returns to the next element.
Copy CodeThe code is as follows:
foreach (array_name as $key = $value)
{
Statement
}
The difference between this and the first method is that there is a $key, that is, in addition to assigning the value of the current element to $value, the key value of the current element is assigned to the variable $key in each loop. The key value can be a subscript value or a string. For example, "0" in Book[0]=1, book[id]= "id" in "001".
program Example 1:
Copy CodeThe code is as follows:
/*-------------------------------------------------------------------------*/
/* Foreach Example 1:value only */
echo "foreach example 1:value only".
';
$a = Array (1, 2, 3, 17);
foreach ($a as $v) {
echo "Current value of". $a. ":". $v. "
";
}
?>
Run results
foreach Example 1:value only
Current value of $a: 1
Current value of $a: 2
Current value of $a: 3
Current value of $a: 17
2
Copy CodeThe code is as follows:
/*-------------------------------------------------------------------------*/
/* foreach example 2:value (with key printed for illustration) */
Echo '
'.'
'." foreach example 2:value (with key printed for illustration) "."
';
$a = Array (1, 2, 3, 17);
$i = 0; /* For illustrative purposes only */
foreach ($a as $v) {
echo "" $a [$i] = $v "."
';
$i + +;
}
Program Run Results
foreach example 2:value (with key printed for illustration)
$a [0] = 1
$a [1] = 2
$a [2] = 3
$a [3] = 17
3
Copy CodeThe code is as follows:
/*-------------------------------------------------------------------------*/
/* Foreach example 3:key and value */
Echo '
'.'
'." foreach Example 3:key and value "."
';
$a = Array (
"One" = 1,
"Both" = 2,
"Three" = 3,
"Seventeen" = 17
);
foreach ($a as $k = = $v) {
echo "" $a [$k] = $v "."
';
}
Program Run Results
foreach Example 3:key and value
$a [one] = 1
$a [both] = 2
$a [Three] = 3
$a [Seventeen] = 17
4
Copy CodeThe code is as follows:
/*-------------------------------------------------------------------------*/
/* foreach Example 4:multi-dimensional arrays */
Echo '
'.'
'." foreach Example 4:multi-dimensional arrays ". '
';
$a = array ();
$a [0][0] = "a";
$a [0][1] = "B";
$a [1][0] = "Y";
$a [1][1] = "Z";
foreach ($a as $v 1) {
foreach ($v 1 as $v 2) {
echo "$v 2" n ";
}
}
Program Run Results
foreach Example 4:multi-dimensional arrays
A b y Z
5
Copy CodeThe code is as follows:
/*-------------------------------------------------------------------------*/
/* foreach Example 5:dynamic arrays */
Echo '
'.'
'." foreach Example 5:dynamic arrays ". '
';
foreach (Array (1, 2, 3, 4, 5) as $v) {
echo "$v" n ";
}
Program Run Results
foreach Example 5:dynamic arrays
1 2 3) 4 5
You can also use this:
Copy CodeThe code is as follows:
$messageNav [' home '] =root_path;
$messageNav [' talent exchange '] = "#"
$messageNav [' dynamic column '] = "hragent/cn/"
$value):?>
"> >
"Class=" > "Onlink"
http://www.bkjia.com/PHPjc/324013.html www.bkjia.com true http://www.bkjia.com/PHPjc/324013.html techarticle foreach () has two uses: the copy code is as follows: foreach (Array_Name as $value) {statement;} here Array_Name is the name of the array you want to traverse, each time the loop, the Array_Name array ...
