PHP | Split comma delimited string into an array without using library function

Given a string. Learn, how to split comma delimited string to an array in PHP?
Submitted by Bhanu Sharma, on August 11, 2019 [Last updated : March 13, 2023]

Splitting Comma Delimited String into an Array

Given a string with comma delimited, we have to split it into an array.

Example

    Input: 
    "Google,Bing,Yahoo!,DuckDuckGo"

    Output:
    arrar of strings after splitting...
    Array
    (
        [0] => Google   
        [1] => Bing     
        [2] => Yahoo!   
        [3] => DuckDuckGo
    )

PHP code to split comma delimited string into an array without using library function

<?php
//PHP code to reverse the string without 
//using library function

//function definition 
//it accepts a string and returns an array 
//delimited by commas
function split_string($text){
    //variable to store the result i.e. an array 
    $arr = [];
    //calculate string length
    $strLength = strlen($text);
    $dl = ','; //delimeter
    $j = 0;
    $tmp = ''; //a temp variable
    //logic - it will check all characters
    //and split the string when comma found
    for ($i = 0; $i < $strLength; $i++) {
    	if($dl === $text[$i]) {
    		$j++;
    		$tmp = '';
    		continue;
    	}
    	$tmp .= $text[$i];
    	$arr[$j] = $tmp;
    }
    //return the result
    return $arr;
}

//main code i.e. function calling
$str = "New Delhi,Mumbai,Chennai,Banglore";
$result = split_string($str);
echo "string is: " .$str. "<br/>";
echo "arrar of strings after splitting..."."<br/>";
print_r($result);

$str = "Google,Bing,Yahoo!,DuckDuckGo";
$result = split_string($str);
echo "string is: " .$str. "<br/>";
echo "arrar of strings after splitting..."."<br/>";
print_r($result);
?>

Output

string is: New Delhi,Mumbai,Chennai,Banglore
arrar of strings after splitting...
Array
(
    [0] => New Delhi
    [1] => Mumbai
    [2] => Chennai
    [3] => Banglore
)
string is: Google,Bing,Yahoo!,DuckDuckGo
arrar of strings after splitting...
Array
(
    [0] => Google   
    [1] => Bing     
    [2] => Yahoo!   
    [3] => DuckDuckGo
)   

Explanation

We use a for loop to convert our comma delimited string into an array. We identify when a (,) appears in the string and copy that into an array then follow this process until the whole length of the string is covered. The inverted string is stored into a temporary variable ($tmp) then moved to an array ($arr[]).

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