$tokens array does not change at all

问题

If I want to operate with a $tokens array it always happens nothing. An example code:

$input = array("⋃","⋃","a","⋃","h");
$impl = implode($input);
$impl = preg_replace('/⋃{2}/u','$0|',$impl);
preg_match_all('~\X~u', $impl, $tokens);


$akzent = array("´");

$result = array_pop($tokens);

echo print_r($result);

Is it because $tokens is not a normal array?

回答1:

The $tokens here is an array of arrays. That is why you need to access all the matches in the first subarray, $tokens[0]. Modify the part of the code like this:

preg_match_all('~\X~u', $impl, $matches);
$tokens = $matches[0];
$result = array_pop($tokens);

See the PHP demo

来源：https://stackoverflow.com/questions/41027075/tokens-array-does-not-change-at-all