PHP - 是否有一个函数只保留字符串中的前X个字母数？

If i have $word = "big words";

How can I only keep, let's say, the first 6 letters, so it becomes:

$word = "big wo";

(in PHP)

Substring function is what you need:

substr($word, 0, 6);

• substr @ php.net

substr, which actually features in almost all languages that have strings.