PHP extension development: How to write cross-platform compatible custom functions?

In order to write cross-platform compatible PHP custom functions, you need to follow these steps: Use PHP native types and avoid platform-specific types. Use realpath() to get the absolute path of the file. Adjust function behavior based on platform differences. Use portable precompilation directives.

PHP extension development: writing cross-platform compatible custom functions

Writing cross-platform compatible PHP custom functions is to ensure An important step for your functions to work correctly across different operating systems and environments. Here are the steps to achieve this:

1. Use portable PHP types

Avoid using platform-specific types, such as pointers to C structures or handles. Instead, use PHP native types such as strings, arrays, or objects.

2. Processing file paths

Since different operating systems handle file paths differently, please use the built-in function realpath() to obtain The absolute path to the file.

3. Adjust behavior based on platform differences

Some features may behave differently on different platforms, such as timestamp processing or path separators. Tune the function's behavior to your specific platform by using PHP_OS constants or using if-else blocks.

4. Use portable precompilation directives

Use #ifdef and #endif precompilation directives, conditionally Compile code blocks related to different platforms independently. This helps maintain cross-platform compatibility of the extension.

Example

Consider a function that calculates the size of a file. The following is an example of its cross-platform compatible version:

<?php
#ifdef PHP_WINDOWS

/**
 * Retrieve the size of a Windows file in bytes.
 *
 * @param string $path The path to the file.
 *
 * @return int The size of the file in bytes.
 */
function get_file_size($path)
{
    if (!file_exists($path)) {
        throw new InvalidArgumentException("File not found: $path");
    }

    $size = filesize($path);

    return $size !== false ? $size : 0;
}
#else

/**
 * Retrieve the size of a file in bytes.
 *
 * @param string $path The path to the file.
 *
 * @return int The size of the file in bytes.
 */
function get_file_size($path)
{
    if (!file_exists($path)) {
        throw new InvalidArgumentException("File not found: $path");
    }

    // In non-Windows environments, use the `stat()` function to determine file size.

    $stats = stat($path);
    if ($stats !== false) {
        return $stats['size'];
    } else {
        return 0;
    }
}
#endif

This example uses the #ifdef and #endif precompilation directives to adjust function behavior according to platform differences, ensuring It has compatibility across Windows and non-Windows platforms.

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