PhP：将数组分成更多行

Question

多年来，我一直在编程 php。现在我有了一个新的愿望。我想让一个长字符串的数组更具可读性：

$var = array( 'help' => 'This is a very long help text. This is a very long help text. This is a very long help text.');

第一次尝试：我试过这个没有成功：

$var = array( 'help' => 'This is a very long help text.'
. 'This is a very long help text.'
. 'This is a very long help text.');

第二次尝试：我已经尝试过了，但没有成功：

$var = array( 'help' => 'This is a very long help text.' . 'This is a very long help text. This is a very long help text.');

顺便说一句：之前没有没有机会构建字符串，我必须在这一行进行。如何将数组分成更多行？

我被要求展示一个真实的例子，这里是：

class JKWerte {
   public static $purifyoptions = array(
     'HTML.Allowed' => 'table, thead, tbody, tfoot, th, tr, td, img[src|alt], div, span, p, br, ul, ol, li, *[class], *[style], *[height], *[width], h1, h2, h3, h4, a[href|title], b, i, em, strong' );

   public function test() {

   }
}

变量是一个类的属性，我称之为 JKWerte::purifyoptions;

Answer 1

静态类变量不能用 PHP 中的表达式初始化。

这是通过 HEREDOC 语法拆分字符串的一种方法，只要它可能包含额外的空格和换行符：

<?php
class JKWerte {
   public static $purifyoptions = array(
     'HTML.Allowed' => <<<EOT
     table, thead, tbody, 
     tfoot, th, tr, td,
     img[src|alt], div,
     span, p, br, ul, ol,
     li, *[class], *[style],
     *[height], *[width], h1,
     h2, h3, h4, a[href|title],
     b, i, em, strong
EOT
   );

   public function test() { }
}

var_dump(JKWerte::$purifyoptions);
?>

输出：

array(1) {
  ["HTML.Allowed"]=>
  string(213) "     table, thead, tbody, 
     tfoot, th, tr, td,
     img[src|alt], div,
     span, p, br, ul, ol,
     li, *[class], *[style],
     *[height], *[width], h1,
     h2, h3, h4, a[href|title],
     b, i, em, strong"
}

或者，您可以稍后定义静态变量的内容，例如在类定义之后：

<?php
class JKWerte {
   public static $purifyoptions = array(
     'HTML.Allowed' => ''
   );

   public function test() { }
}

JKWerte::$purifyoptions['HTML.Allowed'] = 'table, thead, tbody, '
     .'tfoot, th, tr, td, '
     .'img[src|alt], div, '
     .'span, p, br, ul, ol, '
     .'li, *[class], *[style], '
     .'*[height], *[width], h1, '
     .'h2, h3, h4, a[href|title], '
     .'b, i, em, strong';

var_dump(JKWerte::$purifyoptions)
?>

输出：

array(1) {
  ["HTML.Allowed"]=>
  string(172) "table, thead, tbody, tfoot, th, tr, td, img[src|alt], div, span, p, br, ul, ol, li, *[class], *[style], *[height], *[width], h1, h2, h3, h4, a[href|title], b, i, em, strong"
}