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In-depth explanation of the new features of PHP8: Why is it worth looking forward to?
With the continuous development of the Internet, PHP, as a very popular server-side scripting language, has been widely used in the field of website development. With the release of PHP8, it brings a series of eye-catching new features and improvements. In this article, we will explain in depth the new features of PHP8 and provide you with specific code examples to better understand their practical application.
The JIT (just in time compilation) compiler is the most important new feature in PHP8. By introducing JIT, PHP8 can dynamically compile bytecode into local machine code, thereby improving the execution efficiency of applications. The following is an example of the use of the JIT compiler:
<?php opcache_compile_file('file.php'); ?>
PHP8 further improves the function of function parameter type declaration, supporting more accurate types examine. Now, you can use the mixed
type to declare that a parameter can accept multiple different types:
<?php function example(mixed $param) { // 函数体 } ?>
In addition, PHP8 also introduced the readonly
attribute, which is used to declare that only Read parameters:
<?php function example(readonly array $param) { // 函数体 } ?>
PHP8 introduces a new throw expression, which can throw exceptions directly in the expression. Here is an example using throw expressions:
<?php $value = $_GET['value'] ?? throw new InvalidArgumentException('Invalid value'); ?>
PHP8 introduces more powerful type declaration capabilities for properties. Now, you can specify a type for the attribute and set a default value:
<?php class Example { public string $name = 'John Doe'; } ?>
PHP8 introduces a new match expression (match expression), which provides More flexible and clear syntax to handle complex conditional judgments. The following is an example of using a match expression:
<?php $value = 2; $result = match($value) { 1 => 'One', 2 => 'Two', default => 'Other', }; echo $result; // 输出:Two ?>
In addition to the above features, PHP8 also brings many other improvements, such as named ## The new operator #nullsafe makes it easier to handle possibly null values in the method chain; the new string functions, such as
str_contains and
str_starts_with, etc., use Common operations for processing strings; and the abandonment of traditional tag syntax.
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