PHP list() A simple instance of assigning the values ​​in the array to a variable, list array

PHP list() A simple instance of assigning the values ​​in the array to a variable, list array

list()

PHP list() assigns the values ​​in the array to some variables in one step. Like array(), list() is not a true function, but a language construct.

Grammar:

void list( mixed var, mixed ... )Note: list() can only be used on numerically indexed arrays and assumes that numerical indexing starts from 0.

Example 1:

<&#63;php
$arr_age = array(18, 20, 25);
list($wang, $li, $zhang) = $arr_age;
echo $wang;    //输出：18
echo $zhang;    //输出：25
&#63;>

Example 2, data table query:

$result = mysql_query("SELECT id, username, email FROM user",$conn);
while(list($id, $username, $email) = mysql_fetch_row($result)) {
  echo "用户名：$username<br />";
  echo "电子邮箱：$email";
}

list() uses array index

List() allows the use of another array to receive the values ​​assigned to the array, but when using an index array, the order of assignment is reversed from 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] => 25 [1] => 20 [0] => 18 )

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