New functions in PHP8: application scenarios of str_contains()

Some new functions have been added to PHP8, one of the more practical functions is str_contains(). This function is used to determine whether a string contains another substring, and the return value is of Boolean type. Compared with the strpos() function commonly used in PHP, the str_contains() function is more concise and intuitive, and can improve the readability and maintainability of the code. This article will introduce the application scenarios of the str_contains() function.

1. Fuzzy search

In practical applications, fuzzy search is often required, such as searching for product names or article titles. Using the str_contains() function, you can easily determine whether a string contains another string, thereby realizing the fuzzy search function. For example:

$search = "PHP";
$title1 = "PHP是最好的语言之一";
$title2 = "Java也是一种很好的编程语言";
if(str_contains($title1, $search)){
    echo $title1;
}
if(str_contains($title2, $search)){
    echo $title2;
}

In the above code, a variable $search is first defined to represent the keyword to be searched, and then it is determined whether the two titles contain the $search variable. If included, this title is output.

2. Determine whether the URL contains specified parameters

When doing web development, it is often necessary to determine whether the URL contains certain parameters in order to process business logic. This function can be easily implemented using the str_contains() function. For example:

$url = "http://www.example.com/index.php?id=123";
if(str_contains($url, "id=")){
    // 处理逻辑
}

In the above code, it is judged whether the $url variable contains the "id=" string, and if it does, the processing logic is executed.

3. Text Classification

In the application of text classification, some texts need to be classified, such as determining whether an article belongs to technology, entertainment or sports, etc. Using the str_contains() function, you can easily determine whether the article title or text contains certain keywords to perform text classification. For example:

$title = "新冠疫苗开始大规模接种，中国加快推进疫苗研发";
if(str_contains($title, "疫苗")){
    echo "属于科技类别";
}
if(str_contains($title, "体育")){
    echo "属于体育类别";
}

In the above code, it is determined whether the $title variable contains the two keywords "vaccine" and "sports", so as to perform text classification.

4. Determine whether a string is legal

Sometimes it is necessary to determine whether a string is legal, such as determining whether the password meets the specifications, or whether the email address is correct. Use the str_contains() function to easily determine whether a string contains specified characters. For example:

$password = "123456";
if(str_contains($password, "123") && strlen($password)>=6){
    echo "密码符合要求";
}

In the above code, it is judged whether the $password variable contains the substring "123" and whether the password length is greater than or equal to 6 characters. If the conditions are met, "Password meets the requirements" is output.

In short, the str_contains() function is a relatively practical new function in PHP8. It can quickly and easily handle the issue of whether a string contains specified characters, improving the readability and maintainability of the code. In actual development, developers can flexibly use this function according to project needs to achieve more efficient development results.

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