Can php functions pass arrays?

In PHP, a function is a set of statements that can be implemented multiple times to complete a specific task. Functions allow us to break the code into modular parts, making the code easier to maintain and reuse. In functions, we can pass parameters, which can be strings, integers, objects and other data types.

PHP functions can of course pass arrays. In fact, passing arrays is a commonly used way to pass data in PHP.

The method of passing the array is as follows:

1. Pass the index array

When the function is defined, the array can be used as a parameter of the function. The array can be an index array or an association. array. When passing an indexed array, just pass the array argument to the function. The following is sample code for passing an array of indices:

//定义函数
function calculateSum($arr){
    $sum = 0;
    foreach($arr as $value){
        $sum += $value;
    }
    return $sum;
}

//声明数组
$array = array(1, 2, 3, 4, 5);

//调用函数
$totalSum = calculateSum($array);

//输出结果
echo $totalSum; //输出 15

In this example, we define a function called calculateSum() which receives one parameter $arr. This function adds each element in the argument array and returns their sum. Here, we pass the index array $array as a parameter to the calculateSum() function.

2. Pass associative array

In addition to passing index array, we can also pass associative array. The method of passing associative array is the same as the method of passing index array. Just pass the array as a parameter when defining the function. The following is sample code for passing an associative array:

//定义函数
function getKeysAndValues($arr){
    foreach($arr as $key => $value){
        echo $key . '=>' . $value . "
";
    }
}

//声明数组
$array = array('name' => '张三', 'age' => 25, 'gender' => '男');

//调用函数
getKeysAndValues($array);

//输出结果
/*
name => 张三
age => 25
gender => 男
*/

In this example, we define a function called getKeysAndValues() which receives one parameter $arr, this parameter is an associative array. The function iterates through the array and outputs each key and value. Here, we pass the associative array $array as a parameter to the getKeysAndValues() function.

Summary

In PHP, functions can pass arrays. By passing an array, we can easily pass a set of data to the function and process it. We can pass indexed arrays or associative arrays and use them in functions.

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