How to replace the last character of a string in php

php method to replace the last character of a string: first use the "substr" function or "mb_substr" in PHP to intercept the string to the last character; then splice the data you want or use "preg_replace" The method completes the replacement.

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Example:

可以有很多种实现：
1、使用substr方法（或mb_substr）截取至倒数一位，然后拼接自己想要的数据
 
2、使用$str = preg_replace('#.$#i', '要替换的字符', $str);替换
 
举一反三，自己还可想想其他实现方法。

Related introduction:

substr() function returns a part of a string.

Note: If the start parameter is negative and length is less than or equal to start, length is 0.

Syntax

substr(string,start,length)

The preg_replace function performs a regular expression search and replacement.

Syntax

mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

Search for the part of subject that matches pattern and replace it with replacement.

Parameter description:

$pattern: The pattern to be searched, which can be a string or a string array.

$replacement: String or array of strings used for replacement.

$subject: The target string or string array to be searched and replaced.

$limit: Optional, the maximum number of substitutions for each subject string per pattern. The default is -1 (no limit).

$count: Optional, the number of times the replacement is performed.

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