New function in PHP8: efficient string search method for str_contains()

With the release of PHP8, we have ushered in a new function: str_contains(). The function of this function is to efficiently search for a specified substring in a string. Compared with previous PHP functions, str_contains() is more efficient and more convenient to use. In this article, we will introduce the usage and advantages of str_contains() in detail.

In previous PHP versions, we could use the strpos() function to determine whether a string contains a certain substring. However, this method is not very efficient because the strpos() function traverses the entire string to find substrings. When the string is very long, this process becomes very time-consuming. Moreover, for some complex string search situations, the parameter setting of the strpos() function will be very troublesome.

Now, str_contains() can solve this problem. The syntax of this function is very simple. You only need to pass in two parameters, the first is the string to be searched, and the second is the substring to be searched. In this way, we can quickly determine whether a string contains a certain substring.

The following is the syntax of the str_contains() function:

bool str_contains (string $haystack, string $needle)

Among them, $haystack represents the string to be searched , $needle represents the substring to be searched. After the function is executed, a Boolean value is returned, indicating whether the substring is found in the string.

The method of using str_contains() function is very simple. This function can be used for various string type search operations, including but not limited to text file search, URL search, database search, etc. The following is a simple sample code:

// Search for the specified string and determine whether it contains a substring
$string = "PHP8 is the latest version of PHP ";
if (str_contains($string, "latest")) {

echo "字符串中包含了 'latest' ！";

} else {

echo "字符串中未包含 'latest' 。";

}
?>

Run the above code, you will get the following output:

The string contains 'latest'!

We can also use the str_contains() function to make more complex judgments, for example:

// Determine whether a URL points to the GitHub website
$url = "https://github.com/";
if (str_contains($url, "github.com")) {

echo "这是GitHub网站的URL地址。";

} else {

echo "这不是GitHub网站的URL地址。";

}
?>

The output result is:

This is the URL address of the GitHub website.

In addition to the above examples, the str_contains() function can also be applied to many other scenarios. For example, search for a specific element in an array of strings, or find a word in a sentence. These operations can be completed quickly through the str_contains() function, and the efficiency is very high.

In general, the str_contains() function is a very practical string search function that can greatly improve the efficiency and performance of PHP programs. If you haven't used this function yet, give it a try and enjoy the convenience it brings!

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