PHPで、配列の最後尾の値を取得する

問題なく動く

<?
$list = [0,1,2];
$v = end($list);
print "last is $v\n";

last is 2

ギリ動く

<?
$text = "0,1,2";
$v = end(explode(",", $text));
print "last is $v\n";

PHP Notice:  Only variables should be passed by reference in /tmp/hoge.php on line 4
last is 2

文句は言うが一応動く。 @でも付ければ隠蔽できる

動かない

<?
$v = end([0,1,2]);
print "last is $v\n";

PHP Fatal error:  Only variables can be passed by reference in /tmp/hoge.php on line 3

同じエラーだけど Notice から Fatal に変わってる。

非破壊版

<?
$list = [0,1,2];
$v = array_slice($list,-1)[0];
print "last is $v\n";

last is 2

これなら何も壊さない。 優しい世界

• https://www.drupal.org/project/fileviewer/issues/2505065
• php - Exception 'Only variables should be passed by reference - Stack Overflow
• php - Pop an element from exploded string and convert remaining array to string - Stack Overflow
• PHPで「Only variables should be passed by reference....」エラー - Qiita
• explodeとarray_popは同時に使えない | HABATAKIブログ@翔