CascadiaPHP 2024

str_decrement

(PHP 8 >= 8.3.0)

str_decrementDecrement an alphanumeric string

说明

str_decrement(string $string): string

Returns the decremented alphanumeric ASCII string.

参数

string

The input string.

返回值

Returns the decremented alphanumeric ASCII string.

错误/异常

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

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"

参见

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