each () Definition and usage
The each () function generates an array of the key names and key values of the elements pointed to by the current internal pointer to the array, and moves the internal pointer forward.
The returned array contains four elements: The key is named 0,1,key and value. Unit 0 and key contain the key name of the array cell, and 1 and value contain the data.
If the inner pointer crosses the array range, this function returns FALSE.
Grammar
The each (array) parameter description
Array required. Specifies the array to use.
Example 1
Copy CodeThe code is as follows:
$people = Array ("Peter", "Joe", "Glenn", "Cleveland");
Print_r (each ($people));
?>
Output:
Array ([1] = peter [value] = peter [0] = 0 [key] = 0) Example 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:
Copy CodeThe code is as follows:
$people = Array ("Peter", "Joe", "Glenn", "Cleveland");
Reset ($people);
while (list ($key, $val) = each ($people))
{
echo "$key and $val
";
}
?>
Output:
0 = Peter
1 = Joe
2 = Glenn
3 = Cleveland Example Explanation
Because assigning an array to another array resets the original array pointer, so in the example above, if we assign the $people to another variable inside the loop, it will cause an infinite loop.
http://www.bkjia.com/PHPjc/324470.html www.bkjia.com true http://www.bkjia.com/PHPjc/324470.html techarticle each () definition and usage each () function generates an array of the key names and key values of the elements pointed to by the current internal pointer of the array, and moves the internal pointer forward. Returns the array in which the package ...
