PHP Convert Array to Comma Separated String Tutorial

Through this tutorial, you will learn how to convert an array to a comma-separated string in PHP

basically, in PHP you use the implode function to convert the array into comma comma-separated string, and with implode function, you can convert one-dimensional, two-dimensional, and multidimensional arrays to comma separated strings.

Here are some ways to convert an array to a comma-separated string in PHP.

• Method 1: Using implode() Function
• Method 2: Using foreach Loop
• Method 3: Using array_reduce() Function

Method 1: Using implode() Function

The implode() function is a built-in PHP function that can be used to join the elements of an array into a string using a specified delimiter. To convert an array to a comma-separated string, you can use the implode() function with the comma (,) or quotes as the delimiter.

Syntax of using the PHP implode method

The basic syntax of the implode function is:

 implode(separator,array)

Parameters of implode function:

Parameter	Description
separator	Optional. Specifies what to put between the array elements. Default is “” (an empty string)
array	Required. The array to join to a string

Let’s see the following examples to convert one dimensional, two dimensional and multidimensional array to comma separated string in PHP:

Example 1: PHP Array to String Conversion

Let’s take an example for index array convert to string in PHP:

<?php
$array = array("PHP","PYTHON","JAVA");

$string =implode(" ", $array);

echo "The returned string after implod: <br><strong>".$string ."</strong>";
?>

Example 2: PHP Array to Comma Separated String

Let’s take a new example with an array, here you will convert the array to a comma-separated string.

<?php
$array = array("PHP","PYTHON","JAVA");

$string =implode(",", $array);

echo "The returned string after implode with comma: <br><strong>".$string ."</strong>";
?>

Example 3: PHP Two-Dimensional Array Convert to Comma Separated String

Now will take the example of a two-dimensional array. In this example, you will convert two-dimensional array to comma separate string.

<?php
     // Two Dimensional array
	$array = array (
	  array ('01','03','02','15'),
	  array ('05','04','06','10'),
	  array ('07','09','08','11'),
	  array ('12','14','13','16')
	);
	$tmpArr = array();
	foreach ($array as $sub) {
	  $tmpArr[] = implode(',', $sub);
	}
	$result = implode(',', $tmpArr);
	echo $result;

Example 4: PHP Implode – Multidimensional Array to Comma Separated String

Here you will learn how you can convert multidimensional array to comma separated string.

<?php
$multi_dimensional_array = array(

array(

'Name' => 'PHP',

'Email' => '[email protected]'

),

array(

'Name' => 'Java',

'Email' => '[email protected]'

)

);
echo implode(', ', array_map(function ($string) {

return $string['Name'];

}, $multi_dimensional_array));
?>

Method 2: Using foreach Loop

Another method to convert an array into a comma-separated string is by using the foreach loop. This method is useful if you want to modify the array elements before joining them into a string. To convert an array into a comma-separated string using the foreach loop.

<?php
$fruits = array("apple", "banana", "orange", "kiwi");
$fruits_string = "";
foreach($fruits as $fruit){
   $fruits_string .= $fruit . ",";
}
$fruits_string = rtrim($fruits_string, ",");
echo $fruits_string;
?>

Output:

apple,banana,orange,kiwi

Method 3: Using array_reduce() Function

The array_reduce() function is another built-in PHP function that can be used to reduce an array to a single value by applying a callback function to each element of the array. You can use the array_reduce() function to concatenate the elements of the array with a comma.

<?php
$fruits = array("apple", "banana", "orange", "kiwi");
$fruits_string = array_reduce($fruits, function($carry, $item){
   return $carry . $item . ",";
});
$fruits_string = rtrim($fruits_string, ",");
echo $fruits_string;
?>

Output:

apple,banana,orange,kiwi

Conclusion

In this article, you have learned the various methods of converting an array into a comma-separated string in PHP.

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