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In the PHP manual, you see that the matching variable names are:

$pattern = '/[a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*/';

The naming conventions for variable names are:
Must begin with a letter followed by any character in a number, letter, or underscore.

But the top of the regular, \x7f-\xff in the ASCII code table can not find Ah, the 129 yards corresponding to what is it?









------Solution--------------------
The letters are a-z,a-z, as well as ASCII characters from 127 to 255 (0X7F-0XFF).
------Solution--------------------
The internal code value between 0x80 ~ 0xFF is the extended ASCII code, because it is occupied by Chinese characters, usually do not see
But you can see a part of it.

foreach (Get_html_translation_table (html_entities) as $k = = $v) {
  Echo Ord ($k). ' = '. $v. '
';
}

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