What is the purpose of implode in PHP?

The implode function in PHP is used to join the elements of an array into a string. Its purpose is to concatenate the elements of an array with a specified separator and return a string.

For example, use the implode function to connect the elements in an array with commas.

$arr = array("apple", "banana", "orange");
$str = implode(",", $arr);
echo $str; // 输出：apple,banana,orange

The syntax of the implode function is:

implode(separator, array)

One of them, separator represents the string to be used as a delimiter, array represents the array to be joined.

In addition to the implode function, PHP also offers a similar function called join, which serves the same purpose. In fact, implode is just an alias for the join function, and they can be used interchangeably.