How to delete the last character in a string in php? four different methods

In PHP programming, there are many ways to delete the last character in a string. In this article, you will be introduced to these different methods and demonstrated how to implement them using examples.

1. Using substr()
   The substr() function is a PHP string processing function that allows you to extract a substring from a given string. Using this function, you can easily cut the last character from the end of the string.

Here is an example of how to use the substr() function to remove the last character in a string:

$string = "hello world";
$string = substr($string, 0, -1);
echo $string; // 输出结果：hello worl

In the above code, the first parameter of the substr() function is The string to be cut, the second parameter is the starting position of the string to be cut, and the third parameter is the length of the string to be cut. Since we want to remove the last character, we set the second parameter to 0 and the third parameter to a negative number "-1". This will indicate that the last character of the string is to be removed.

2. Using mb_substr()
   If you are dealing with strings in multi-byte character sets, such as Chinese or Japanese, then the mb_substr() function is a better choice . The mb_substr() function is a multi-byte string processing function that can handle Unicode characters.

The following is a code example that uses the mb_substr() function to delete the last character of a string:

$string = "你好，世界";
$string = mb_substr($string, 0, -1);
echo $string; // 输出结果：你好，世

3. Use rtrim()
   The rtrim() function can remove spaces or other specific characters at the end of a string. If we specify a space as the second parameter, we can use this function to remove a character from the end of the string.

The following is a code example that uses the rtrim() function to delete one character at the end of a string:

$string = "hello world!";
$string = rtrim($string, " ");
echo $string; // 输出结果：hello world

In the above code, the first parameter of the rtrim() function is The string from which one character is to be deleted. The second parameter specifies the characters to be removed. In this example, we specified the space character as the second parameter.

4. Use substr_replace()
   The substr_replace() function is a PHP string processing function that can insert or replace characters or substrings in a string at a specified position . Using this function we can programmatically replace the character at the end of the string with any other character.

The following is a code example that uses the substr_replace() function to delete a character from the end of a string:

$string = "hello world";
$string = substr_replace($string, "", -1);
echo $string; // 输出结果：hello worl

In the above code, the first parameter of the substr_replace() function is the string to be modified. The second parameter is the string to be inserted or replaced. In this case, we set it to an empty string, which means we want to remove the last character. The third parameter is the position of the string to start modifying. In this case, we set it to a negative integer "-1", which will remove the last character of the string.

Summary:
Through this article, you learned about four different methods for removing the last character from a PHP string. It is particularly emphasized that when using different methods, the most appropriate method should be selected based on the string being processed and its character set. Hopefully these examples will help you become more proficient in working with strings.

The above is the detailed content of How to delete the last character in a string in php? four different methods. For more information, please follow other related articles on the PHP Chinese website!