PHP preg_split with hyphen?

In PHP, you can use preg_split() to split strings at specific patterns, including hyphens. The preg_split() function uses regular expressions to define where the string should be split, giving you more control than simple explode().

Basic Hyphen Splitting

To split a string at every hyphen, use a simple pattern ?

<?php
$string = "apple-banana-cherry";
$result = preg_split('/-/', $string);
print_r($result);
?>

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

Conditional Splitting with Lookahead

For more complex splitting, such as splitting only at hyphens followed by numbers, use a positive lookahead pattern ?

<?php
$values = "ABC-DEF IJKL-3553435-8990987876";
$exploded = preg_split('/-(?=[0-9])/', $values, 3);
print_r($exploded);
?>

Array
(
    [0] => ABC-DEF IJKL
    [1] => 3553435
    [2] => 8990987876
)

How the Pattern Works

The pattern /-(?=[0-9])/ breaks down as follows:

Limiting Split Results

The third parameter in preg_split() limits the number of splits. Setting it to 3 creates at most 3 array elements ?

<?php
$text = "one-two-three-four-five";
$limited = preg_split('/-/', $text, 3);
print_r($limited);
?>

Array
(
    [0] => one
    [1] => two
    [2] => three-four-five
)

Conclusion

Use preg_split() with lookahead patterns like /-(?=[0-9])/ for conditional splitting at hyphens. The limit parameter controls the maximum number of array elements created.