PHP list () assigns a value in an array to a simple instance of a variable _php instance

List ()

The PHP list () assigns the values in the array to some variables in one step. Like array (), list () is not a real function, but a language structure.

Grammar:

void list (mixed var, mixed ...) Note: The list () can only be used for arrays of numeric indices and assumes that the numeric index starts at 0.

Example 1:

<?php
$arr _age = Array (a);
List ($wang, $li, $zhang) = $arr _age;
echo $wang;    Output:
$zhang echo;    Output:
?>

Example 2, datasheet query:

$result = mysql_query ("SELECT ID, username, email from user", $conn);
while (list ($id, $username, $email) = Mysql_fetch_row ($result)) {
  echo username: $username <br/>;
  echo "e-mail: $email";
}

List () using an array index

The list () allows the use of another array to receive the value of an array assignment, except that when an indexed array is used, the order of assignment is the opposite of the order listed in list ():

$arr _age = Array (18, 20, 25);

List ($a [0], $a [1], $a [2]) = $arr _age;

Print_r ($a); the output $a array structure is as follows:

Array ([2] => [1] => [0] => 18)

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