How to Use explode() in PHP: Syntax and Examples

In PHP, use the explode() function to split a string into an array by a specified delimiter. It takes the delimiter and the string as arguments and returns an array of substrings.

Syntax

The explode() function splits a string into pieces using a delimiter and returns an array of those pieces.

• delimiter: The character(s) where the string will be split.
• string: The input string to split.
• limit (optional): Maximum number of pieces to return.

php

array explode(string $delimiter, string $string, int $limit = PHP_INT_MAX);

Example

This example splits a comma-separated list into an array using a comma as the delimiter and prints the resulting array.

php

<?php
$text = "apple,banana,cherry";
$fruits = explode(",", $text);
print_r($fruits);
?>

Output

Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
)

Common Pitfalls

Common mistakes include:

• Using an empty string as the delimiter, which causes a warning.
• Expecting explode() to include the delimiter in the output (it does not).
• Not handling the optional limit parameter correctly, which can affect the number of returned pieces.

php

<?php
// Wrong: empty delimiter
// $result = explode("", "hello world"); // Warning

// Right: use a valid delimiter
$result = explode(" ", "hello world");
print_r($result);

// Using limit
$limited = explode(",", "a,b,c,d", 3);
print_r($limited);
?>

Output

Array
(
    [0] => hello
    [1] => world
)
Array
(
    [0] => a
    [1] => b
    [2] => c,d
)

Quick Reference

Parameter	Description
delimiter	String where the split happens
string	Input string to split
limit (optional)	Max number of pieces returned

Key Takeaways

Use explode() to split strings into arrays by a delimiter.

The delimiter cannot be an empty string.

The optional limit controls how many pieces are returned.

explode() does not include the delimiter in the output pieces.

Always check the output array to handle your data correctly.