在PHP中将字符串拆分为Unicode字符数组的最佳方法是什么? [英] What is the best way to split a string into an array of Unicode characters in PHP?

问题描述

在PHP中，将字符串拆分为Unicode字符数组的最佳方法是什么?如果输入的内容不一定是UTF-8?

In PHP, what is the best way to split a string into an array of Unicode characters? If the input is not necessarily UTF-8?

我想知道输入字符串中的Unicode字符集是否是另一组Unicode字符的子集.

I want to know whether the set of Unicode characters in an input string is a subset of another set of Unicode characters.

为什么不直接使用mb_系列功能，因为前几个答案没有?

Why not run straight for the mb_ family of functions, as the first couple of answers didn't?

推荐答案

您可以在PCRE regex中使用'u'修饰符；参见模式修改器(引用):

You could use the 'u' modifier with PCRE regex ; see Pattern Modifiers (quoting) :

u(PCRE8)

u (PCRE8)

此修饰符可启用其他功能 PCRE的功能是 与Perl不兼容.图案 字符串被视为UTF-8.这 修饰符可从PHP 4.1.0获得 或更高版本(在Unix上以及从PHP 4.2.3起) 在Win32上. UTF-8的有效性 从PHP 4.3.5开始检查模式.

This modifier turns on additional functionality of PCRE that is incompatible with Perl. Pattern strings are treated as UTF-8. This modifier is available from PHP 4.1.0 or greater on Unix and from PHP 4.2.3 on win32. UTF-8 validity of the pattern is checked since PHP 4.3.5.

例如，考虑以下代码:

header('Content-type: text/html; charset=UTF-8');  // So the browser doesn't make our lives harder
$str = "abc 文字化け, efg";

$results = array();
preg_match_all('/./', $str, $results);
var_dump($results[0]);

您将获得无法使用的结果:

You'll get an unusable result:

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string ' ' (length=1)
  4 => string '�' (length=1)
  5 => string '�' (length=1)
  6 => string '�' (length=1)
  7 => string '�' (length=1)
  8 => string '�' (length=1)
  9 => string '�' (length=1)
  10 => string '�' (length=1)
  11 => string '�' (length=1)
  12 => string '�' (length=1)
  13 => string '�' (length=1)
  14 => string '�' (length=1)
  15 => string '�' (length=1)
  16 => string ',' (length=1)
  17 => string ' ' (length=1)
  18 => string 'e' (length=1)
  19 => string 'f' (length=1)
  20 => string 'g' (length=1)

但是，使用以下代码:

header('Content-type: text/html; charset=UTF-8');  // So the browser doesn't make our lives harder
$str = "abc 文字化け, efg";

$results = array();
preg_match_all('/./u', $str, $results);
var_dump($results[0]);

(请注意正则表达式末尾的'u')

您得到想要的东西:

array
  0 => string 'a' (length=1)
  1 => string 'b' (length=1)
  2 => string 'c' (length=1)
  3 => string ' ' (length=1)
  4 => string '文' (length=3)
  5 => string '字' (length=3)
  6 => string '化' (length=3)
  7 => string 'け' (length=3)
  8 => string ',' (length=1)
  9 => string ' ' (length=1)
  10 => string 'e' (length=1)
  11 => string 'f' (length=1)
  12 => string 'g' (length=1)

希望这会有所帮助:-)

Hope this helps :-)

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