php each returns the current key-value pair in the array and moves the array pointer forward one step

php The each function is used to obtain the key-value pairs of the array and move the array pointer forward one step. The each function is often used in conjunction with list to traverse the array. This article introduces you to the basic usage of each. Friends who need it can refer to it

each function returns the current key/value pair in the array and moves the array pointer forward one step

Basic syntax

array each (array &$array)

After executing each(), the array pointer will stay at the next unit in the array or when touching Stay at the last cell when reaching the end of the array. If you want to use each to iterate through the array again, you must use reset().

Parameter introduction:

each() function generates an array consisting of the key name and key value of the element pointed to by the current internal pointer of the array, and moves the internal pointer forward.

Return value:

Returns the key/value pair of the current pointer position in the array array and moves the array pointer forward. Key-value pairs are returned as a four-element array with key names 0, 1, key, and value. Cells 0 and key contain the key names of the array cells, and 1 and value contain the data. If the internal pointer is past the end of the array, each() returns FALSE.

each function example one:

<?php
$foo = array(
  "bob",
  "fred",
  "jussi",
  "jouni",
  "egon",
  "marliese"
);
$bar = each($foo);
print_r($bar);
?>

Run result;

Array
(
[1] => bob
[value] => bob
[0] => 0
[key] => 0
)

each function example two:

each() combined with list() to traverse the array

<?php
$fruit = array(
  &#39;a&#39; => &#39;apple&#39;,
  &#39;b&#39; => &#39;banana&#39;,
  &#39;c&#39; => &#39;cranberry&#39;
);
reset($fruit);
while (list($key, $val) = each($fruit)) {
  echo " $key => $val <br/>";
}
?>

Run result:

a => apple
b => banana
c => cranberry

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