Use the str_contains() function in PHP8 to quickly handle string matching

With the rapid development of the Internet, the use of strings is becoming more and more common in daily life, and string matching is one of the most common problems in processing strings. Therefore, the efficiency and accuracy of string matching are also developed One of the important issues of concern to researchers. In PHP8, a very practical string processing function has been added: str_contains(), which can quickly locate substrings in strings and improve the efficiency of string matching. This article will introduce and discuss how to use this function in actual development. function to handle string matching problems.

1. Introduction to str_contains() function

The str_contains() function is a newly added string processing function in PHP8, which is used to find whether a string contains a specified substring. The syntax format of this function is as follows:

bool str_contains(string $haystack, string $needle)

Among them, $haystack represents the string that needs to be searched, and $needle represents the substring that needs to be searched. If $haystack contains the substring $needle, the function returns true, otherwise it returns false.

2. Use the str_contains() function to achieve fast string matching

In actual development, string matching is a frequently used operation. When using the traditional method for string matching, you need to traverse the entire string and compare each substring one by one to see if it matches. This method is inefficient and time-consuming. Using the str_contains() function can greatly improve the matching efficiency, for example:

// 传统的字符串匹配方法
str = "Hello, World!";
if (strpos(str, "World!") !== false) {
    echo "字符串匹配成功！";
}

// 使用str_contains()函数进行字符串匹配
str = "Hello, World!";
if (str_contains(str, "World!")) {
    echo "字符串匹配成功！";
}

It can be seen that using the str_contains() function can simplify the code and implement string matching operations more conveniently.

3. Practical Application

In actual development, string matching is widely used. The following will introduce how to use the str_contains() function to handle string matching problems in several common scenarios.

1. Check whether the URL link contains keywords

When developing a website, it is usually necessary to check whether the URL link contains certain keywords so that it can be processed accordingly. Use the str_contains() function to quickly determine whether the URL link contains the specified keyword, for example:

$url = "https://www.example.com/search?q=apple";
if (str_contains($url, "search")) {
    // URL链接中包含搜索关键字
    // 进行搜索操作
} elseif (str_contains($url, "product")) {
    // URL链接中包含产品关键字
    // 进行产品展示操作
}

2. Check whether the entered email address meets the specifications

Register as a development user , login and other functions, it is necessary to verify whether the email address entered by the user meets the specifications. Use the str_contains() function to quickly determine whether the email address contains key characters, for example:

$email = "john@example.com";
if (str_contains($email, "@") && str_contains($email, ".")) {
    // 邮箱地址符合规范
    // 进行注册或登录操作
} else {
    // 邮箱地址不符合规范
    // 提示用户重新输入
}

3. Check whether the entered password contains specific characters

In development user registration, When logging in and other functions, it is necessary to verify whether the password entered by the user contains specific characters to improve account security. Use the str_contains() function to quickly determine whether the password contains specific characters, for example:

$password = "1qaz2wsx!@";
if (str_contains($password, "!") || str_contains($password, "#") || str_contains($password, "$")) {
    // 密码符合规范
    // 进行注册或登录操作
} else {
    // 密码不符合规范
    // 提示用户重新输入
}

IV. Notes

You need to pay attention to the following when using the str_contains() function:

1. This function is only applicable to PHP8 and above versions. When using it, you need to confirm whether the PHP version supports this function.
2. The return value of this function is of Boolean type and needs to be processed accordingly based on the return value.
3. This function is only suitable for simple string matching. For complex string processing, other string processing functions need to be used.

5. Summary

This article introduces the newly added str_contains() function in PHP8, and discusses in detail how to use this function to handle string matching problems in actual development. Using the str_contains() function can quickly and conveniently handle string matching problems, improve development efficiency, and reduce development costs. When using this function, you need to pay attention to the return value type of the function, PHP version compatibility and other issues, so as to better utilize this function for string processing.

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