ASSIGN variables as if they were an ARRAY.
<?php
arr list ( mix $var1 [, mix $var2, ..., mix $varN ] )
where,
$var1 = A variable to assign
$var2 = The second variable to assign
. . . . . . . . .
$varN = The last variable to assign
?>
EXERCISE
<?php
$record = [ "Pink Floyd",
"Louder than Words",
"The Endless River",
"Classic rock",
"2004",
"Sony Music"];
list ($band, $music, $album,
$musictype, $year, $recordcompany ) = $record;
echo 'Music: ' . $music .
'<br>Band: ' . $band .
'<br>Year: ' . $year .
'<br>Album: ' . $album .
'<br>Record Company: ' . $recordcompany .
'<br>Music Type: ' . $musictype;
?>
EXERCISE
<?php
$locality = [ "São Paulo",
"Praça de Sé",
"-23.5503099",
"-46.6342009",
"01001-000" ];
list ($state, $address, $lati, $long, $zipcode ) = $locality;
echo 'Locality: ' . $address .
'<br>State: ' . $state .
'<br>Position = (' . $lati . ', ' . $long . ')
<br>Zip Code: ' . $zipcode;
?>
EXERCISE
<?php
foreach(array(array(1,2), array(3,4)) as list($a, $b)) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($a . $b);
echo '</pre>';
}
$array = array(
array('a', 'b'),
array('c', 'd'),
);
foreach ($array as list($a, $b)) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($a . $b);
echo '</pre>';
}
$multi = array(
array(array(1,2), array(3,4)),
array(array(5,6), array(7,8)),
);
foreach ($multi as list(list($a, $b), list($c, $d))) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($a . $b . $c . $d);
echo '</pre>';
}
foreach ($multi as $key => list(list($a, $b), list($c, $d))) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($key . $a . $b . $c . $d);
echo '</pre>';
}
?>
EXERCISE
<?php
foreach (array(array(1,2), array(3,4)) as list($a, )) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($a);
echo '</pre>';
}
$array = [['a', 'b'], 'c', 'd'];
foreach($array as list(, $a)) {
echo '- - - - - - - - - - - - -<pre>';
var_dump($a);
echo '</pre>';
}
?>
EXERCISE
<?php
$array = [['a', 'b'], 'c', 'd'];
foreach($array as list($key) => list(list(), $a)) {
}
?>
EXERCISE
<?php
$array = [['a', 'b'], 'c', 'd'];
foreach($array as $key => list()) {
}
?>
EXERCISE
<?php
$points = [
["x" => 1, "y" => 2],
["x" => 2, "y" => 1]
];
echo 'The given $points:<br>';
var_dump($points);
foreach ($points as list("x" => $x, "y" => $y)) {
echo '<br><br>';
var_dump($x, $y);
}
echo PHP_EOL;
$invertedPoints = [
"x" => [1, 2],
"y" => [2, 1]
];
echo '<br><br>The given $invertedPoints:<br>';
var_dump($invertedPoints);
foreach ($invertedPoints as list(0 => $row1, 1 => $row2)) {
echo '<br><br>';
var_dump($row1, $row2);
}
?>
EXERCISE
<?php
list($a) = NULL;
list($b) = 1;
list($c) = 1.;
list($d) = 'foo';
list($e) = print '';
echo '<pre>';
var_dump($a, $b, $c, $d, $e);
echo '</pre>';
?>
EXERCISE
<?php
$arr = array(2, 1);
$b =& $arr;
list(,$a) = $b;
echo '<pre>';
var_dump($a, $b);
echo '</pre>';
?>
EXERCISE
<?php
$str = "foo";
list($a, $b, $c) = $str;
var_dump($a, $b, $c);
print "<br><br>";
$int = 1;
list($a, $b, $c) = $int;
var_dump($a, $b, $c);
print "<br><br>";
$obj = new stdClass;
list($a, $b, $c) = $obj;
var_dump($a, $b, $c);
print "<br><br>";
$arr = array(1, 2, 3);
list($a, $b, $c) = $arr;
var_dump($a, $b, $c);
?>
EXERCISE
<?php
list($a, list($b, list(list($d)))) = array();
?>
EXERCISE
<?php
list($x, $y) = function() { };
var_dump($x, $y);
?>
EXERCISE
<?php
list([$a]) = [[1]];
var_dump($a);
?>
EXERCISE
<?php
var_dump ( list(1, 2, 3) );
?>
EXERCISE
<?php
list(,,,,,,,,,,) = [];
?>
EXERCISE
<?php
$antonyms = [
"good" => "bad",
"happy" => "sad",
];
list("good" => $good_antonym,
"happy" => $happy_antonym) = $antonyms;
var_dump($good_antonym, $happy_antonym);
echo PHP_EOL;
$powersOfTwo = [
1 => 2,
2 => 4,
3 => 8
];
list(1 => $two_1, 2 => $two_2,
3 => $two_3) = $powersOfTwo;
var_dump($two_1, $two_2, $two_3);
echo PHP_EOL;
$contrivedMixedKeyTypesExample = [
7 => "the best PHP version",
"elePHPant" => "the cutest mascot"
];
list(7 => $seven,
"elePHPant" => $elePHPant)
= $contrivedMixedKeyTypesExample;
var_dump($seven, $elePHPant);
echo '<br><br>';
echo PHP_EOL;
$allTogetherNow = [
"antonyms" => $antonyms,
"powersOfTwo" => $powersOfTwo,
"contrivedMixedKeyTypesExample"
=> $contrivedMixedKeyTypesExample
];
list(
"antonyms" => list("good" => $good_antonym,
"happy" => $happy_antonym),
"powersOfTwo" => list(1 => $two_1,
2 => $two_2, 3 => $two_3),
"contrivedMixedKeyTypesExample" => list(7 => $seven,
"elePHPant" => $elePHPant)
) = $allTogetherNow;
var_dump($good_antonym, $happy_antonym);
echo '<br><br>';
var_dump($two_1, $two_2, $two_3);
echo '<br><br>';
var_dump($seven, $elePHPant);
?>
EXERCISE
<?php
$results = [
0 => 0,
1 => 1,
"" => ""
];
list(NULL => $NULL,
1.5 => $float,
FALSE => $FALSE,
TRUE => $TRUE) = $results;
var_dump($NULL, $float, $FALSE, $TRUE);
echo '<br>';
echo PHP_EOL;
list("0" => $zeroString, "1" => $oneString) = $results;
echo '<br>';
var_dump($zeroString, $oneString);
echo '<br><br>';
list(STDIN => $resource) = [];
?>
EXERCISE
<?php
// All the following should print 'a' then 'b'
list($a, $b) = ['a', 'b'];
var_dump($a);
echo '<br>';
var_dump($b);
echo '<br><br>';
list(0 => $a, 1 => $b) = ['a', 'b'];
var_dump($a);
echo '<br>';
var_dump($b);
echo '<br><br>';
list(1 => $b, 0 => $a) = ['a', 'b'];
var_dump($a);
echo '<br>';
var_dump($b);
echo '<br><br>';
$arr = [];
list($arr[], $arr[]) = ['a', 'b'];
var_dump($arr[0]);
echo '<br>';
var_dump($arr[1]);
echo '<br><br>';
$arr = [];
list(0 => $arr[], 1 => $arr[]) = ['a', 'b'];
var_dump($arr[0]);
echo '<br>';
var_dump($arr[1]);
echo '<br><br>';
$arr = [];
list(1 => $arr[], 0 => $arr[]) = ['b', 'a'];
var_dump($arr[0]);
echo '<br>';
var_dump($arr[1]);
echo '<br><br>';
$arr = [];
list(list(1 => $arr[], 0 => $arr[])) = [['b', 'a']];
var_dump($arr[0]);
echo '<br>';
var_dump($arr[1]);
echo '<br><br>';
$arr = [];
list('key1' => $arr[], 'key2' => $arr[]) =
['key2' => 'b', 'key1' => 'a'];
var_dump($arr[0]);
echo '<br>';
var_dump($arr[1]);
echo '<br><br>';
// This should print 'foo'
$a = 0;
list($a => $a) = ['foo', 'bar'];
var_dump($a);
echo '<br><br>';
// This should print 'bar' then 'foo'
$a = 0;
$b = 1;
list($b => $a, $a => $c) = ['bar' => 'foo', 1 => 'bar'];
var_dump($a);
echo '<br>';
var_dump($c);
?>
EXERCISE
<?php
$i = 0;
$a = [
0 => [
'b' => 'bar',
'a' => 'foo',
],
1 => 'a',
3 => 'b',
];
list($a[$i++] => $a[$i++], $a[$i++] => $a[$i++]) = $a[$i++];
var_dump($i);
echo '<br>';
// should be 5
var_dump($a[2]);
echo '<br>';
// should be 'foo'
var_dump($a[4]);
// should be 'bar'
?>
EXERCISE
<?php
$arr = [
1 => "one",
2 => "two",
3 => "three"
];
const COMPILE_TIME_RESOLVABLE = 1;
define('PROBABLY_NOT_COMPILE_TIME_RESOLVABLE',
file_get_contents("data:text/plain,2"));
$probablyNotCompileTimeResolvable3 = 3 * 1;
list(
COMPILE_TIME_RESOLVABLE => $one,
PROBABLY_NOT_COMPILE_TIME_RESOLVABLE => $two,
$probablyNotCompileTimeResolvable3 => $three
) = $arr;
echo '<pre>';
var_dump($one, $two, $three);
echo '</pre>';
?>
EXERCISE
<?php
$antonyms = [
"good" => "bad",
"happy" => "sad",
];
list(
"good" => $good,
"happy" => $happy
) = $antonyms;
echo '<pre>';
var_dump($good, $happy);
echo '</pre>';
echo PHP_EOL;
$antonyms = [
"good" => "bad",
"happy" => "sad",
];
list(
"good" => $good,
"happy" => $happy,
) = $antonyms;
echo '<pre>';
var_dump($good, $happy);
echo '</pre>';
?>
EXERCISE
<?php
$contrivedMixedKeyTypesExample = [
7 => "the best PHP version",
"elePHPant" => "the cutest mascot"
];
list(5 => $five, "duke" => $duke)
= $contrivedMixedKeyTypesExample;
var_dump($five, $duke);
?>
EXERCISE
<?php
$contrivedKeyedAndUnkeyedArrayExample = [
0,
1 => 1,
"foo" => "bar"
];
list($zero, 1 => $one, "foo" => $foo)
= $contrivedKeyedAndUnkeyedArrayExample;
?>
EXERCISE
<?php
$points = [
["x" => 1, "y" => 2],
["x" => 2, "y" => 1]
];
list(list("x" => $x1, "y" => $y1),
list("x" => $x2, "y" => $y2)) = $points;
echo '<pre>';
var_dump($x1, $y1, $x2, $y2);
echo '</pre>';
echo PHP_EOL;
$invertedPoints = [
"x" => [1, 2],
"y" => [2, 1]
];
list("x" => list($x1, $x2),
"y" => list($y1, $y2)) = $invertedPoints;
echo '<pre>';
var_dump($x1, $y1, $x2, $y2);
echo '</pre>';
?>
EXERCISE
<?php
$arr = array(1, array(2));
list(&$a, list(&$b)) = $arr;
var_dump($a, $b);
echo '<br><br>';
var_dump($arr);
echo '<br><br><br><br>';
$arr = array(1, array(2));
list($a, &$b) = $arr;
var_dump($arr);
echo '<br><br><br><br>';
$arr = array(1, array(2));
[&$a, [&$b]] = $arr;
var_dump($a, $b);
echo '<br><br>';
var_dump($arr);
echo '<br><br><br><br>';
$arr = array(1, array(2));
[&$a, [&$b], &$c] = $arr;
var_dump($a, $b, $c);
echo '<br><br>';
var_dump($arr);
echo '<br><br><br><br>';
$arr = array("one" => 1, "two" => array(2));
["one" => &$a, "two" => [&$b], "three" => &$c] = $arr;
var_dump($a, $b, $c);
echo '<br><br>';
var_dump($arr);
?>
EXERCISE
<?php
$arr = array(new stdclass);
list(&$a, &$b) = $arr;
var_dump($a, $b);
echo '<br><br>';
var_dump($arr);
?>
EXERCISE
<?php
$a = 1;
$b =& $a;
$arr = [&$a, &$b];
list(&$a, &$b) = $arr;
var_dump($a, $b, $arr);
echo '<br><br>';
$b++;
var_dump($a, $b, $arr);
echo '<br><br>';
unset($a, $b, $arr);
/*
* $a is first set as a reference to the 0'th elem, '1'
* $a is then set to the value of the 1'st elem, '2'
* $arr would look like, [2,2]
* Increment $a, and it should be [3, 2]
*/
$arr = [1, 2];
list(&$a, $a) = $arr;
var_dump($a);
echo '<br><br>';
$a++;
var_dump($arr);
echo '<br><br>';
unset($a, $arr);
/*
* We do not allow references to the same variable of rhs.
*/
$a = [1, 2];
$ref =& $a;
list(&$a, &$b) = $a;
var_dump($a, $b);
echo '<br><br>';
$a++; $b++;
var_dump($ref);
?>
EXERCISE
<?php
list(&$foo) = [42];
?>
EXERCISE
<?php
$a = [1, 2, 3];
list($a, $b, $c) = $a;
var_dump($a, $b, $c);
echo '<br><br>';
$b = [1, 2, 3];
list($a, $b, $c) = $b;
var_dump($a, $b, $c);
echo '<br><br>';
$c = [1, 2, 3];
list($a, $b, $c) = $c;
var_dump($a, $b, $c);
echo '<br><br>';
$a = [[1, 2], 3];
list(list($a, $b), $c) = $a;
var_dump($a, $b, $c);
echo '<br><br>';
$b = [[1, 2], 3];
list(list($a, $b), $c) = $b;
var_dump($a, $b, $c);
echo '<br><br>';
$b = [1, [2, 3]];
list($a, list($b, $c)) = $b;
var_dump($a, $b, $c);
echo '<br><br>';
$c = [1, [2, 3]];
list($a, list($b, $c)) = $c;
var_dump($a, $b, $c);
?>