


Use the function str_contains() in PHP8 to achieve fast string matching
With the development of the Internet, string processing has become a common task in programming. To solve the problem of string matching, PHP8 introduced a new function str_contains(), which can quickly return whether a string contains a specified string. This function will be a very useful tool for developers who need to perform string matching frequently.
1. Basic usage of str_contains() function
str_contains() function is used to determine whether a string contains a specified string. Its syntax is as follows:
bool str_contains( string $haystack, string $needle)
Among them, $haystack represents the original string, and $needle represents the string to be detected. If the original string contains the specified string, the function returns true, otherwise it returns false.
Here are some examples:
Example 1:
$str1 = "Hello World!";
if (str_contains($str1, "World")) {
echo "The string contains the word 'World'";
} else {
echo "The string does not contain the word 'World'";
}
In this example, $haystack is "Hello World!" and $needle is "World". Since $haystack contains $needle, the function will return true and print out the string "The string contains the word 'World'".
Example 2:
$str2 = "Hello World!";
if (str_contains($str2, "Universe")) {
echo "The string contains the word 'Universe'";
} else {
echo "The string does not contain the word 'Universe'";
}
In this example, $haystack is "Hello World!" and $needle is "Universe". Since $haystack does not contain $needle, the function will return false and print out the string "The string does not contain the word 'Universe'".
2. Advantages of str_contains() function
Previously, PHP already had the functions strstr() and strpos(), which are used to find substrings in strings and return their positions. However, the str_contains() function has the following advantages:
- More concise code
Using the str_contains() function, only one line of code is needed to complete the string matching task . For example:
if (str_contains($str, "needle")) {
// Code to execute if the string contains "needle"
}
In comparison, use strstr() or strpos( ) function, you need to perform an if conditional judgment on the return value before you can determine whether the match is successful.
- More intuitive code
The naming of the str_contains() function is very intuitive, and its use is more in line with the natural habits of programmers. Compared with other functions, developers using this function do not need to read the function document to find the appropriate parameter values, and it is more recognizable when used directly. - Higher performance
After testing, the performance of the str_contains() function is comparable to or even better than the previous string matching function. In the case of large data volumes, the str_contains() function can provide faster matching speed because its internal implementation uses a more efficient algorithm.
3. How to migrate the project to use the str_contains() function
If you want to use the str_contains() function in your project, you need to ensure that the PHP version has been upgraded to 8.0 or above. Once the upgrade is complete, you need to modify the locations in your project where strstr() or strpos() functions are used.
First of all, you need to choose the location that needs to be updated based on the actual situation of the project. If you need to use the function in a large amount of code, you can use the search and replace function to modify the old function call to the new function call.
For example, call the $strstr() function:
if (strstr($haystack, $needle)) {
// ...
}
Modify Call the $str_contains() function:
if (str_contains($haystack, $needle)) {
// ...
}
In this way, your project can start using str_contains() function.
4. Conclusion
The str_contains() function is one of the string matching functions introduced in PHP8. It has stronger performance and is more concise and clear to use. If you are still using the strstr() or strpos() function, it is recommended to actively migrate to the str_contains() function if necessary.
The above is the detailed content of Use the function str_contains() in PHP8 to achieve fast string matching. For more information, please follow other related articles on the PHP Chinese website!

The article discusses PHP, detailing its full form, main uses in web development, comparison with Python and Java, and its ease of learning for beginners.

PHP handles form data using $\_POST and $\_GET superglobals, with security ensured through validation, sanitization, and secure database interactions.

The article compares PHP and ASP.NET, focusing on their suitability for large-scale web applications, performance differences, and security features. Both are viable for large projects, but PHP is open-source and platform-independent, while ASP.NET,

PHP's case sensitivity varies: functions are insensitive, while variables and classes are sensitive. Best practices include consistent naming and using case-insensitive functions for comparisons.

The article discusses various methods for page redirection in PHP, focusing on the header() function and addressing common issues like "headers already sent" errors.

Article discusses type hinting in PHP, a feature for specifying expected data types in functions. Main issue is improving code quality and readability through type enforcement.

The article discusses PHP Data Objects (PDO), an extension for database access in PHP. It highlights PDO's role in enhancing security through prepared statements and its benefits over MySQLi, including database abstraction and better error handling.

Article discusses creating and securing PHP APIs, detailing steps from endpoint definition to performance optimization using frameworks like Laravel and best security practices.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Zend Studio 13.0.1
Powerful PHP integrated development environment

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 English version
Recommended: Win version, supports code prompts!
