Learn more about the new features of PHP8: How to use the str_contains function and code to simplify string judgment?

In-depth study of the new features of PHP8: How to use the str_contains function and code to simplify string judgment?

In computer programming, string processing is a very basic and common operation. In the PHP language, the function of processing strings has always attracted the attention of developers. PHP8, as the latest version of the PHP programming language, introduces many new features and improvements, one of which is the introduction of a new function str_contains() to simplify string judgment.

In the past, the operation of determining whether a string contained another string was usually implemented using the strpos() function. For example, if we want to determine whether a string contains a certain keyword, we can use the return value of the strpos() function to determine whether it is false. However, this method is cumbersome and requires multiple steps to implement, and the code can easily become complex.

The str_contains() function introduced in PHP8 solves this problem very well. The str_contains() function is used to determine whether a string contains another string. It returns a Boolean value indicating whether it contains. The method of calling this function is very simple. You only need to pass in two parameters, which are the string to be searched and the target string to be checked:

str_contains($haystack, $needle);

Among them, $haystack is the string to be searched, $ needle is the target string to be checked. If $haystack contains $needle, the function returns true, otherwise it returns false. Through this function, we can more concisely determine whether a string contains a certain keyword.

In addition to using the str_contains() function, PHP8 also introduces some other string judgment functions, such as str_starts_with() and str_ends_with(). The function of these two functions is to determine whether a string starts or ends with another string. Their usage is similar to the str_contains() function, except that the conditions for judgment are different.

These new string judgment functions not only make the code more concise, but also improve the readability and maintainability of the code. In previous versions, in order to achieve similar functions, we needed to use some complex regular expressions or custom functions to process string judgments. Now, with these new features, we can realize string judgment through simple function calls, which not only reduces code writing, but also improves code execution efficiency.

For example, we want to check whether a URL starts with https, which can be easily achieved using the str_starts_with() function:

$url = "https://www.example.com";
if (str_starts_with($url, "https")) {
    echo "是安全链接";
} else {
    echo "非安全链接";
}

With such a simple code, we can easily determine whether a URL is A secure link. Similarly, we can use the str_ends_with() function to determine whether a string ends with a certain suffix, making it easier to process strings.

In summary, the str_contains() function and other string judgment functions introduced in PHP8 provide a more concise and efficient way to process strings. They not only simplify the writing of code, but also improve the readability and maintainability of the code. By in-depth learning and using these new features, we can better utilize PHP8 to process strings and improve development efficiency.

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