PHP Array Exercises : Generate an array with a range taken from a string

Last update on May 30 2025 13:14:49 (UTC/GMT +8 hours)

29. Array Range from String

Write a PHP program to generate an array with a range taken from a string.

Sample Solution:

PHP Code:

<?php
// Define a function called string_range that takes a string as input
function string_range($str1) 
{
  // Use a regular expression to match number ranges in the input string
  preg_match_all("/([0-9]{1,2})-?([0-9]{0,2}) ?,?;?/", $str1, $a);
  
  // Initialize an empty array to store the numeric range
  $x = array ();

  // Iterate through the matched ranges and merge them into a single array
  foreach ($a[1] as $k => $v) 
  {
    // Merge the current range into the result array using the range function
    $x  = array_merge ($x, range ($v, (empty($a[2][$k])?$v:$a[2][$k])));
  }

  // Return the final array representing the numeric range
  return ($x);
}

// Test the function with a sample string and print the result
$test_string = '1-2 18-20 9-11';
print_r(string_range($test_string));

?>

Output:

Array                                                       
(                                                           
    [0] => 1                                                
    [1] => 2                                                
    [2] => 18                                               
    [3] => 19                                               
    [4] => 20                                               
    [5] => 9                                                
    [6] => 10                                               
    [7] => 11                                               
) 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP script to extract a numerical range from a string and convert it into an array of integers.
• Write a PHP function to parse a string containing a start and end value separated by a delimiter and then generate the full range as an array.
• Write a PHP program to validate a string as a number range and then output the corresponding sequence in an array.
• Write a PHP script to read a string of comma-separated values representing a range and return an array of numbers within that range.

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