php中有没有向右取字符串的函数

php中有没有向右取字符串的函数？
就像excel里面的right一样。

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substr();

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引用

substr();

substr能向右取吗？它是类似以excel的MID函数啊

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$str="abcdefg";

$des=substr($str,0,3);//从$str的第一个字符开始,向右去3个字符,也就是"abc"

$des=substr($str,-3,3);//从$str的倒数第三个字符开始,向右去3个字符,也就是"efg"

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substr
(PHP 3, PHP 4, PHP 5)

substr -- Return part of a string
Description
string substr ( string string, int start [, int length] )


substr() returns the portion of string specified by the start and length parameters.

If start is non-negative, the returned string will start at the start'th position in string, counting from zero. For instance, in the string 'abcdef', the character at position 0 is 'a', the character at position 2 is 'c', and so forth.

例子 1. Basic substr() usage

<?php
echo substr('abcdef', 1);    // bcdef
echo substr('abcdef', 1, 3);  // bcd
echo substr('abcdef', 0, 4);  // abcd
echo substr('abcdef', 0, 8);  // abcdef
echo substr('abcdef', -1, 1); // f

// Accessing single characters in a string
// can also be achived