How to output irregular array in php

In PHP, an array is a very powerful and flexible data structure that can store multiple values, and each value has a unique key to identify it. Typically, each item of an array has the same data type, such as number or string. However, in some cases we may need to output an irregular array, that is, each element of the array is not of the same data type or length.

The following will introduce some methods for outputting irregular arrays:

Method 1: Use the print_r function

In PHP, the print_r function can output any type of variables and arrays . For an irregular array, we can use the function output to view its structure and contents. For example, the following is an irregular array:

$array = array(
    'apple',
    'banana',
    array(
        'orange',
        'kiwi'
    ),
    123,
    true
);

We use the print_r function to output it:

Array
(
    [0] => apple
    [1] => banana
    [2] => Array
        (
            [0] => orange
            [1] => kiwi
        )

    [3] => 123
    [4] => 1
)

Method 2: Use the var_dump function

The var_dump function can output variables Details, including type, length, and value. Similarly, for an irregular array, we can use the var_dump function output to view its structure and content. For example, the following is an irregular array:

$array = array(
    'apple',
    'banana',
    array(
        'orange',
        'kiwi'
    ),
    123,
    true
);

We can use the var_dump function to output it:

array(5) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(6) "banana"
  [2]=>
  array(2) {
    [0]=>
    string(6) "orange"
    [1]=>
    string(4) "kiwi"
  }
  [3]=>
  int(123)
  [4]=>
  bool(true)
}

Method 3: Use foreach loop output

We can use foreach Loop through an irregular array and print its contents. For example, the following is an irregular array:

$array = array(
    'apple',
    'banana',
    array(
        'orange',
        'kiwi'
    ),
    123,
    true
);

We can use the foreach loop to output it:

foreach($array as $value) {
    if(is_array($value)) {
        foreach($value as $item) {
            echo $item . '<br>';
        }
    } else {
        echo $value . '<br>';
    }
}

Output result:

apple
banana
orange
kiwi
123
1

Through the above three methods, we It is possible to output an irregular array and then further process it as required.

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