How to remove the following strings in php

When developing a web application, it's rare to have a perfect return string or a string that does exactly what you want it to. It is often necessary to process the string, delete unnecessary parts or add additional content. This article explains how to remove the end of a string using PHP.

In PHP, you can use the substr function to extract a substring of a specified length from a string. This means we can use the substr function to take only the part we need and omit the end of the string.

The following is an example code for using the substr function to intercept a string:

// 原始字符串
$str = "This is a sample string.";

// 从0开始，取14个字符，即"this is a samp"
$shortened = substr($str, 0, 14);

echo $shortened;

Output:

This is a samp

As you can see, the substr function starts from the beginning of the string at the specified length. Start extracting the substring from the starting position.

In order to intercept a substring from the end of the string, you can use the strlen function to get the length of the string and perform operations. The following is an example code that uses this method to intercept the content at the end of a string:

// 原始字符串
$str = "This is a sample string.";

// 从字符串结尾开始，取6个字符，即"string"
$shortened = substr($str, strlen($str)-6);

echo $shortened;

Output:

string

As you can see, the substr function intercepts the substring of the corresponding length according to the length of the string. This eliminates the content at the end of the string.

In addition, you can also use the str_replace function to delete specified content from a string. Here is a sample code that uses the str_replace function to remove the last few characters of a string:

// 原始字符串
$str = "This is a sample string.";

// 要删除的字符数
$num_of_chars = 7;

// 使用str_replace函数删除字符串结尾的内容
$shortened = str_replace(substr($str, -1 * $num_of_chars), "", $str);

echo $shortened;

Output:

This is a sample s

As you can see, the last seven characters are removed from the string using the str_replace function. characters.

In general, using PHP to remove the end of a string is a very practical technique that can avoid unnecessary character output, allowing readers to focus more on the information conveyed in this article.

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