如何在 PHP 中回显或打印数组？

Question

I have this array

Array
(
  [data] => Array
    (
      [0] => Array
        (
          [page_id] => 204725966262837
          [type] => WEBSITE
        )

      [1] => Array
        (
          [page_id] => 163703342377960
          [type] => COMMUNITY
        )
      )
)

How can I just echo the content without this structure?

I tried

foreach ($results as $result) {
    echo $result->type;
    echo "<br>";
}

Answer 1

To see the contents of array you can use:

1. print_r($array); or if you want nicely formatted array then:

    echo '<pre>'; print_r($array); echo '</pre>';

2. Use var_dump($array) to get more information of the content in the array like the datatype and length.

3. You can loop the array using php's foreach(); and get the desired output. More info on foreach is in PHP's documentation website:foreach

Answer 2

This will do

foreach($results['data'] as $result) {
    echo $result['type'], '<br>';
}

Answer 3

If you just want to know the content without a format (eg, for debugging purposes) I use this:

echo json_encode($anArray);

This will show it as a JSON which is pretty human-readable.

Answer 4

There are multiple functions for printing array content that each has features.

print_r()

Prints human-readable information about a variable.

$arr = ["a", "b", "c"];

echo "<pre>";
print_r($arr);
echo "</pre>";

Array
(
    [0] => a
    [1] => b
    [2] => c
)

var_dump()

Displays structured information about expressions that includes its type and value.

echo "<pre>";
var_dump($arr);
echo "</pre>";

array(3) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
}

var_export()

Displays structured information about the given variable that returned representation is valid PHP code.

echo "<pre>";
var_export($arr);
echo "</pre>";

array (
  0 => 'a',
  1 => 'b',
  2 => 'c',
)

Note that because the browser condenses multiple whitespace characters (including newlines) to a single space ( answer ), you need to wrap above functions in <pre></pre> to display result in thee correct format.

---

Also, there is another way to print array content with certain conditions.

echo

Output one or more strings. So if you want to print array content using echo , you need to loop through the array and in the loop use echo to print array items.

foreach ($arr as $key=>$item){
    echo "$key => $item <br>";
}

0 => a
1 => b
2 => c

Answer 5

You can use print_r , var_dump and var_export functions of PHP:

print_r : Convert into human-readable form

<?php
    echo "<pre>";
    print_r($results);
    echo "</pre>";
?>

var_dump() : will show you the type of the thing as well as what's in it.

var_dump($results);

foreach loop : using a for each loop, you can iterate each and every value of an array.

foreach($results['data'] as $result) {
    echo $result['type'] . '<br>';
}

Answer 6

尝试使用print_r以人类可读的形式打印它。

Answer 7

foreach($results['data'] as $result) {
    echo $result['type'], '<br />';
}

or echo $results['data'][1]['type'];

Answer 8

You don't have any need to use a for loop to see the data into the array. You can simply do it in the following manner:

<?php
    echo "<pre>";
    print_r($results);
    echo "</pre>";
?>

Answer 9

人类可读的（例如，可以记录到文本文件中......）：

print_r($arr_name, TRUE);

Answer 10

You can use var_dump() function to display structured information about variables/expressions, including its type and value, or you can use print_r() to display information about a variable in a way that's readable by humans.

Example: Say we have got the following array, and we want to display its contents.

$arr = array ('xyz', false, true, 99, array('50'));

print_r() function - Displays human-readable output

Array
(
    [0] => xyz
    [1] =>
    [2] => 1
    [3] => 99
    [4] => Array
        (
            [0] => 50
        )
)

var_dump() function - Displays values and types

array(5) {
  [0]=>
  string(3) "xyz"
  [1]=>
  bool(false)
  [2]=>
  bool(true)
  [3]=>
  int(100)
  [4]=>
  array(1) {
    [0]=>
    string(2) "50"
  }
}

The functions used in this answer can be found on the PHP documentation website, var_dump() and print_r() .

For more details:

• How to display PHP variable values with echo, print_r, and var_dump

• How can I echo an array in PHP?

Answer 11

If you want a parsable PHP representation, you could use:

$parseablePhpCode = var_export($yourVariable,true);

If you echo the exported code to a file.php (with a return statement) you may require it as

$yourVariable = require('file.php');

Answer 12

I checked the answers, however, (for each) in PHP it is deprecated and no longer works with the latest PHP versions.

Usually, we would convert an array into a string to log it somewhere, perhaps debugging, test, etc.

I would convert the array into a string by doing:

$Output = implode(",", $SourceArray);

Whereas:

$output is the result (where the string would be generated

",": is the separator (between each array field).

$SourceArray: is your source array.

Answer 13

If you only need echo 'type' field, you can use function ' array_column ' like:

$arr = $your_array;
echo var_dump(array_column($arr['data'], 'type'));

Answer 14

Loop through and print all the values of an associative array, You could use a foreach loop, like this:

foreach($results as $x => $value) {
    echo $value;
}