How to delete the last character in php

php method to delete the last character: 1. Use "substr($arr_str,0,strlen($arr_str)-1);" to delete; 2. Use "substr($arr_str, 0, -1) ) method to delete; 3. Delete through the "rtrim" method.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

Three ways to delete the last character of a string in PHP programs

Common syntax format:

foreach ($arr as $key => $value) {
$arr_str = $arr['x_id'] . ',' . $arr_str;
}

Assume that the characters in the character array $arr are

arr[0] = 'a';
arr[1] = 'b';
arr[2] = 'c';

Then, the spliced ​​$arr_str string is a, b, c. At this time, we need to delete the last character ','.

Delete in two php Summary of the method for the last character:

Method 1:

substr($arr_str,0,strlen($arr_str)-1);

Detailed explanation: substr() function syntax: string substr ( string $string , int $start [, int $length ] )

Strlen () Function: Int Strlen (String $ String)

This Example Principle:

## First use the strlen () function to determine the length of the character string $ arr_str, and then use it to use The substr() function intercepts $arr_str to the penultimate digit of $arr_str. This removes the last ",".

Usage experience:

Not recommended, php There is a simpler and more useful way!

Method 2:

substr($arr_str, 0, -1)

Detailed explanation: directly use the substr() function to cut off the last character in reverse order;

Use Feeling: It’s still very appropriate~~ However, first you have to make sure that there must be content in the string, and the last digit must be missing!

Method 3:          

rtrim($arr_str, ",")

Detailed explanation: rtrim() function Syntax: string rtrim ( string $str [, string $character_mask ] )

rtrim - delete the blank characters (or other characters) at the end of the string

//系统常量定义 
//去THinphp手册中进行查找 
echo "<br>"."网站的根目录地址".__ROOT__." "; 
echo "<br>"."入口文件地址".__APP__." "; 
echo "<br>"."当前模块地址".__URL__." "; 
echo "<br>"."当前url地址".__SELF__." "; 
echo "<br>"."当前操作地址".__ACTION__." "; 
echo "<br>"."当前模块的模板目录".__CURRENT__." "; 
echo "<br>"."当前操作名称".ACTION_NAME." "; 
echo "<br>"."当前项目目录".APP_PATH." "; 
echo "<br>"."当前项目名称".APP_NAME." "; 
echo "<br>"."当前项目的模板目录".APP_TMPL_PATH." "; 
echo "<br>"."项目的公共文件目录".APP_PUBLIC_PATH." "; 
echo "<br>"."项目的配置文件目录".CONFIG_PATH." "; 
echo "<br>"."项目的公共文件目录".COMMON_PATH." "; 
//自动缓存与表相关的全部信息 
echo "<br>"."项目的数据文件目录".DATA_PATH." runtime下的data目录"; 
echo "<br>"." ".GROUP_NAME.""; 
echo "<br>"." ".IS_CGI.""; 
echo "<br>"." ".IS_WIN.""; 
echo "<br>"." ".LANG_SET.""; 
echo "<br>"." ".LOG_PATH.""; 
echo "<br>"." ".LANG_PATH.""; 
echo "<br>"." ".TMPL_PATH.""; 
//js放入的位置，供多个应用的公共资源 
echo "<br>"." ".WEB_PUBLIC_PATH."";

Recommended learning: "

PHP Video tutorial》

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