Examples of new features in PHP8: How to use string operations and code to improve efficiency?

PHP8 is the latest version of the PHP language, bringing many new features and improvements. Among them, string operation and code efficiency improvement are one of the focuses of PHP8. This article will demonstrate with examples how to use the new features of PHP8 to optimize string operations and improve code efficiency.

1. New string operation function

1. str_contains function

str_contains is a new string operation function, used to determine a string Contains another string. In previous versions, we usually used the strpos function to achieve this functionality. However, in PHP8, we can use the str_contains function directly to achieve more concise and clear code.

// Versions before PHP 7
if (strpos($haystack, $needle) !== false) {

// 包含

}

// PHP 8
if (str_contains($haystack, $needle)) {

// 包含

}

2. str_starts_with and str_ends_with functions

str_starts_with and str_ends_with are two A new string manipulation function used to determine whether a string begins or ends with another string. In previous versions, we usually used the substr function and comparison operators to achieve this functionality. However, in PHP8, we can directly use the str_starts_with and str_ends_with functions to achieve simpler and more readable code.

// Versions before PHP 7
if (substr($string, 0, strlen($prefix)) === $prefix) {

// 开头匹配

}

if (substr($string, -strlen($suffix)) === $suffix) {

// 结尾匹配

}

// PHP 8
if (str_starts_with($string , $prefix)) {

// 开头匹配

}

if (str_ends_with($string, $suffix)) {

// 结尾匹配

}

3. str_contains , Ignore case option for str_starts_with and str_ends_with functions

In PHP8, str_contains, str_starts_with and str_ends_with functions added a case ignore option. By setting the third parameter to true, string case can be ignored, allowing for more flexible and easier-to-use string operations.

// Usage example of ignoring case
if (str_contains($haystack, $needle, true)) {

// 包含（忽略大小写）

}

if (str_starts_with($ string, $prefix, true)) {

// 开头匹配（忽略大小写）

}

if (str_ends_with($string, $suffix, true)) {

// 结尾匹配（忽略大小写）

}

2. Code efficiency improvement

1. JIT compiler

PHP8 introduces a new JIT (Just-In-Time) compiler that can run PHP code Instantly compiles into local instructions, thereby improving code execution efficiency. The introduction of the JIT compiler has significantly improved the performance of PHP when dealing with complex calculations and a large number of loops.

To use the JIT compiler, just set opcache.jit to "on" in the php.ini file. Enabling the JIT compiler will provide higher performance and better responsiveness of PHP applications.

2. Type hints and initialization of attributes

PHP8 began to support type hints and initialization of attributes, which makes the code more readable and reduces the occurrence of errors and exceptions. . We can directly define types and initial values ​​in the attributes of the class, thereby improving the maintainability and stability of the code.

class Person {

public string $name = 'John Doe';
public int $age = 30;
public bool $active = true;

}

$person = new Person();
echo $person->name; // Output: John Doe

3. Improvements of anonymous classes

PHP8 has improved support for anonymous classes. We can directly define properties and methods in the class when instantiating the anonymous class. The advantage of this is that it simplifies the code structure and makes the code more concise and readable.

$message = new class() {

public string $content = 'Hello World';

public function show() {
    echo $this->content;
}

};

$message->show(); // Output: Hello World

To sum up, the new features of PHP8 have greatly improved string operations and code efficiency. By using the new string manipulation functions, we can perform string matching and judgment more concisely and clearly. The introduction of the JIT compiler and other code efficiency improvements have greatly improved the performance, response speed and maintainability of PHP applications. For PHP developers, mastering and applying these new features will help write efficient and optimized code.

The above is the detailed content of Examples of new features in PHP8: How to use string operations and code to improve efficiency?. For more information, please follow other related articles on the PHP Chinese website!