在PHP中要獲取傳遞給函數(shù)的參數(shù)數(shù)量，1.可使用func_num_args()函數(shù)直接獲取數(shù)量；2.結(jié)合func_get_args()同時獲取參數(shù)值和數(shù)量；3.現(xiàn)代PHP推薦使用...$arguments操作符更清晰地處理。這些方法適用於不同場景：func_num_args()適合僅需計數(shù)的情況，func_get_args()適合需要訪問所有參數(shù)值的情形，而...$arguments則提供更好的可讀性和類型安全性，尤其適用於PHP 5.6及以上版本。

In PHP, if you want to find out how many arguments were passed to a function, there's a straightforward way to do it using built-in functions designed for variable-length argument handling.

Using func_num_args()

The simplest and most direct method is to use the func_num_args() function inside your function. This function returns the number of arguments that were passed when the function was called.

 function exampleFunction() {
    echo "Number of arguments: " . func_num_args();
}

exampleFunction(1, 2, 3); // Outputs: Number of arguments: 3

It works regardless of whether your function explicitly defines any parameters or not. Just keep in mind that this function should only be used inside a user-defined function.

Accessing the Arguments with func_get_args()

If you also need to access the actual values of the arguments (not just the count), you can pair func_num_args() with func_get_args() . The latter returns an array containing all the arguments passed to the function.

 function exampleFunction() {
    $args = func_get_args();
    echo "Number of arguments: " . count($args) . "\n";

    foreach ($args as $index => $value) {
        echo "Argument " . ($index 1) . ": $value\n";
    }
}

exampleFunction('apple', 42, true);

This will output:

 Number of arguments: 3
Argument 1: apple
Argument 2: 42
Argument 3: 1

You can use this combination when you're building flexible functions that handle different numbers of inputs.

Modern Approach with ...$arguments (PHP 5.6 )

Starting from PHP 5.6, you can use the splat operator ( ... ) to capture all arguments into an array directly. This is often cleaner and more readable than using func_get_args() .

 function exampleFunction(...$arguments) {
    echo "Number of arguments: " . count($arguments) . "\n";

    foreach ($arguments as $index => $value) {
        echo "Argument " . ($index 1) . ": $value\n";
    }
}

exampleFunction('apple', 42, true);

• You can still define some named parameters before the ...$arguments .
• It's generally preferred in modern code due to better readability and type safety.

For example:

 function exampleFunction($name, ...$rest) {
    echo "Name: $name\n";
    echo "Other arguments count: " . count($rest) . "\n";
}

So depending on your PHP version and needs:

• Use func_num_args() for quick checks.
• Combine func_get_args() when you need both count and values.
• Prefer ...$arguments in modern PHP for clarity and flexibility.

基本上就這些。

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