How to intercept the first few digits of data in php

The method for php to intercept the first few digits of data is:

// 访问字符串中的单个字符
// 也可以使用中括号
$string = 'abcdef';
echo $string[0];                 // a
echo $string[3];                 // d
echo $string[strlen($string)-1]; // f
?>
中文字符串的截取和获取长度 mb_substr()
$str = '我abc是谁';  //utf-8编码的字符串
echo mb_substr($str, 0, 2, 'utf-8'); //输出 我a
$str = '我是谁';  //gbk编码的字符串
echo mb_substr($str, 0, 1, 'gbk'); //输出 我
Recommended tutorial: "php tutorial"
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