(PHP 8 >= 8.3.0)
str_decrement — Decrement an alphanumeric string
stringThe input string.
Returns the decremented alphanumeric ASCII string.
A ValueError is thrown if
string is empty.
A ValueError is thrown if
string is not an alphanumeric
ASCII string.
A ValueError is thrown if
string cannot be decremented.
For example, "A" or "0".
示例 #1 Basic str_decrement() example
<?php
$str = 'ABC';
var_dump(str_decrement($str));
?>以上示例会输出：
string(3) "ABB"
示例 #2 str_decrement() example with a carry
<?php
$str = 'ZA';
var_dump(str_decrement($str));
$str = 'AA';
var_dump(str_decrement($str));
?>以上示例会输出：
string(2) "YZ" string(1) "Z"