How to remove the first character on the right in php

php method to remove the first character on the right is: 1. Create a php sample file; 2. Use the built-in function "strlen()" to get the string length and save it as $str; 3. Use "substr ()" function extracts the string starting from 0 to length -1 and saves it as $new_str; 4. Echo outputs $new_str.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

PHP can use the built-in functions substr() and strlen() to remove the first character on the right.

The specific steps are as follows:

1. Use strlen() to get the length of the string

2. Use substr() Extract the substring of the string starting from 0 to the length minus 1

Here are some sample codes:

```php
<?php
// 示例字符串
$str = "Hello World!";
// 去除右侧第一个字符
$new_str = substr($str, 0, strlen($str) - 1);
echo $new_str; // 输出：Hello World
?>
```

Also, if you know what characters you want to delete, you can Use the rtrim() function:

```php
<?php
// 示例字符串
$str = "Hello World!";
// 去除右侧的感叹号
$new_str = rtrim($str, "!");
echo $new_str; // 输出：Hello World
?>
```

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