each () Definition and usage
The each () function generates an array of key names and key values of the elements that the array's current internal pointer points to, and moves the internal pointer forward.
The four elements included in the returned array: The key name is 0,1,key and value. The unit 0 and key contain the key names of the array cells, and 1 and value contain the data.
If the internal pointer crosses the array range, this function returns FALSE.
Grammar
each (array) parameter description
Array required. Specify the array to use.
Example 1
Copy Code code as follows:
<?php
$people = Array ("Peter", "Joe", "Glenn", "Cleveland");
Print_r (each ($people));
?>
Output:
Array ([1] => Peter [value] => Peter [0] => 0 [key] => 0) Example 2
Each () is often used in conjunction with the list () to traverse an array. This example is similar to the previous example, but the loop outputs the entire array:
Copy Code code as follows:
<?php
$people = Array ("Peter", "Joe", "Glenn", "Cleveland");
Reset ($people);
while (the list ($key, $val) = each ($people))
{
echo "$key => $val <br/>";
}
?>
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 previous example, if we assign $people to another variable within the loop, we will cause an infinite loop.
