PHP join() Function Last Updated : 21 Jun, 2023 Comments Improve Suggest changes Like Article Like Report The join() function is built-in function in PHP and is used to join an array of elements which are separated by a string. Syntax string join( $separator, $array) Parameter: The join() function accepts two parameters out of which one is optional and one is mandatory. $separator : This is an optional parameter and is of string type. The values of the array will be join to form a string and will be separated by the $separator parameter provided here. This is optional, if not provided the default is "" (i.e. an empty string)$array : The array whose value is to be joined to form a string. Return Type: The return type of join() function is string. It will return the joined string formed from the elements of $array. Examples: Input : join(array('Geeks','for','Geeks') Output : GeeksforGeeks Input : join("-",array('Geeks','for','Geeks') Output : Geeks-for-Geeks Below program illustrates the working of join() function in PHP: PHP <?php // PHP Code to implement join function $InputArray = array('Geeks','for','Geeks'); // Join without separator print_r(join($InputArray)); print_r("\n"); // Join with separator print_r(join("-",$InputArray)); ?> Output: GeeksforGeeks Geeks-for-Geeks Comment More infoAdvertise with us Next Article PHP join() Function S ShivamKD Follow Improve Article Tags : PHP Functions PHP-string Practice Tags : Functions Similar Reads PHP addcslashes() Function The addcslashes() function is a built-in function in PHP. The addcslashes() function is used to add backslashes before some specified characters in a given string. Syntax: string addcslashes($string, $characters) Parameters: This function accepts two parameters as shown in the above syntax and are d 2 min read PHP addslashes() Function The addslashes() function is an inbuilt function in PHP and it returns a string with backslashes in front of predefined characters. It does not take any specified characters in the parameter. The predefined characters are: single quote (')double quote (")backslash (\)NULL Note: The addslashes() func 2 min read PHP bin2hex() Function The bin2hex() function in PHP converts a string to hexadecimal values. The conversion is done byte-wise with the high-nibble first. Note: It is not for converting strings representing binary digits into hexadecimal. Syntax: bin2hex($string) Parameters: This function accepts a single parameter $strin 1 min read PHP chop() Function The chop() in PHP is used to remove white spaces or any other specified characters from the end of a string. Syntax: string chop($string, $character) Parameters: This function accepts two parameters as shown in the above syntax and are described below: $string : It is used to specify the string whic 2 min read PHP chr() Function The chr() function is a built-in function in PHP and is used to convert a ASCII value to a character. It accepts an ASCII value as a parameter and returns a string representing a character from the specified ASCII value. The ASCII value can be specified in decimal, octal, or hex values. Octal values 2 min read PHP chunk_split() Function The chunk_split() function is a built-in function in PHP. The chunk_split() function is used to split a string into smaller chunks of a specific length. Syntax: string chunk_split($string, $length, $end) Parameters: This function accepts three parameters as shown in the above syntax and are describe 2 min read PHP convert_uudecode() Function The convert_uudecode() is a built in function in PHP. This function decode a uuencoded string encoded using convert_uuencode() function. The uudecode() functions makes string into printable form. Syntax: string convert_uudecode(string) Parameters: The uuencoded string which will be decoded. Return T 1 min read PHP convert_uuencode() Function The convert_uuencode() is a built-in function in PHP. The convert_uuencode() function encodes a string using the uuencode algorithm. Uuencode encoding translates all strings (including binary data) into printable characters which makes them safe for network transmissions. Syntax: String convert_uuen 1 min read PHP count_chars() Function The count_chars() is an inbuilt function in PHP and is used to perform several operations related to string like the number of an ASCII character occurs in a string. Syntax : count_chars(string,return_mode); Parameters: The count_chars() function takes two parameters string and return_mode as explai 2 min read PHP crc32() Function The crc32() function helps us to calculate a 32-bit crc or cyclic redundancy checksum polynomial for a string. The function uses the CRC32 algorithm.This function can be used to validate data integrity. However, to ensure that we get the correct string representation from the crc32() function, we ne 2 min read Like