How to remove the last character of a string in PHP (3 methods)

When writing PHP code, sometimes we need to remove the last character in a string. This may be because we need to remove special characters at the end when processing some text data or because the last character of the string is redundant.

But how to remove the last character of a string in PHP? There are many ways to achieve this functionality. Several commonly used methods are introduced below.

Method 1: Use the substr function

The substr function is a very commonly used string interception function in PHP, and its usage is very simple. Only two parameters need to be passed in. The first parameter is the string to be intercepted, and the second parameter is the starting position, which can be a positive or negative number. If a negative number is passed in, it means starting from the last number at the end of the string.

So how to use the substr function to delete the last character of a string? We just need to pass in -1 for the starting position. The details are as follows:

$str = 'hello world';
$str = substr($str, 0, -1);
echo $str; //输出：hello worl

In this code, the first parameter is the string that needs to be intercepted. The second parameter is the starting position. We pass in 0 to start intercepting from the beginning of the string. The third parameter is the length to be intercepted, -1 means taking one digit from the end, so the last digit is deleted.

Method 2: Use the mb_substr function

Unlike the substr function, the mb_substr function can process Chinese strings. If we want to process Chinese strings, it is recommended to use the mb_substr function.

The usage method is similar to the substr function, with only slight adjustments. The details are as follows:

$str = '你好，世界';
$str = mb_substr($str, 0, -1, "UTF-8");
echo $str; //输出：你好，世界

It should be noted that the mb_substr function needs to pass in the fourth parameter to specify the character encoding.

Method 3: Use the rtrim function

The rtrim function can remove the specified characters at the end of the string. If no characters are specified, all whitespace characters at the end of the string are removed.

The specific usage is as follows:

$str = 'hello world!';
$str = rtrim($str, '!');
echo $str; //输出：hello world

In this code, the first parameter of the rtrim function is the string that needs to be processed, and the second parameter is the character to be deleted. In this example, we specified that the character to be removed is the exclamation mark, so the exclamation mark at the end of the string is removed.

Summary

The above three methods can be used to delete the last character of a PHP string. Which method to choose depends on your needs and the encoding of the string. When processing English characters, you can use the substr or rtrim function. When processing Chinese characters, you can use the mb_substr function.

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