What are the methods to print arrays in php

In PHP, array is a very common and practical data type. During development, we often need to print an array to check whether its contents are what we want. Here are several ways to print arrays in PHP.

1. print_r() function

The print_r() function is one of the most commonly used methods for printing arrays in PHP. Use this function to output an array to a browser or command line terminal in a human-readable form. The following is an example of using the print_r() function to print an array:

$arr = array("apple", "banana", "orange");
print_r($arr);

Output results:

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

As can be seen from the above results, the print_r() function outputs each element of the array to A line with square brackets indicating the index position of the element.

2. var_dump() function

The var_dump() function is another commonly used array printing method, which can output the contents of the array in a more detailed format. The following is an example of using the var_dump() function to print an array:

$arr = array("apple", "banana", "orange");
var_dump($arr);

Output results:

array(3) {
  [0]=>
  string(5) "apple"
  [1]=>
  string(6) "banana"
  [2]=>
  string(6) "orange"
}

As can be seen from the above results, the var_dump() function outputs the type of each element, length and actual value.

3. foreach loop

In addition to using special printing functions, we can also use foreach loop to print arrays. The following is an example of using a foreach loop to print an array:

$arr = array("apple", "banana", "orange");

foreach ($arr as $key => $value) {
    echo "Key: ".$key.", Value: ".$value."<br>";
}

Output results:

Key: 0, Value: apple
Key: 1, Value: banana
Key: 2, Value: orange

As can be seen from the above results, the foreach loop outputs each element of the array one by one and prints them separately. Get the key and value of the element.

Summary

The above are the commonly used methods of printing arrays in PHP, which are the print_r() function, var_dump() function and foreach loop. During the development process, choosing the appropriate printing method according to different situations will help us better debug and develop.

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