PHP array introductory tutorial: Get the current array key and value

In PHP array functions, each() function returns the current key/value pair of input_array and advances the pointer one position.

The form is as follows: array each(array array)

The returned array contains four keys, key 0 and key contain the key name, and key 1 and value contain the corresponding data. If the pointer is at the end of the array before each() is executed, false is returned.

For example:

<?php
$fruits = array("apple", "banana", "orange", "pear");  
print_r ( each($fruits) );  
  
// Array ( [1] => apple [value] => apple [0] => 0 [key] => 0 )  
?>

each() is often used in conjunction with list() to iterate over an array.

Example, loop to output the entire array:

<?php
$fruits = array("apple", "banana", "orange", "pear");  
reset($fruits);  
  
while (list($key, $val) = each($fruits))  
{  
echo "$key => $val<br />";  
} //by bbs.it-home.org
  
// 0 => apple  
// 1 => banana  
// 2 => orange  
// 3 => pear  
?>

Since assigning one array to another array will reset the original array pointer, in the above example if we assign $fruits to another variable inside the loop, it will cause an infinite loop. This completes array traversal.