Leetcode Longest Common Prefix

Problem

Example 1:

Input: strs = ["flower","flow","flight"]
Output: "fl"
Example 2:

Example 2:

Input: strs = ["dog","racecar","car"]
Output: ""
Explanation: There is no common prefix among the input strings.

Constraints:

Solution

class Solution {
 function longestCommonPrefix($strs) {
 $strs_count = count($strs);
 if ($strs_count < 2) {
 return $strs_count ? $strs[0] : '';
 }
 
 $equal = $strs[0];
 for ($n = 1; $n < $strs_count; $n++) {
 $a = str_split($equal);
 $b = str_split($strs[$n]);
 $equal = '';
 $max = min(count($a), count($b));
 
 for($i = 0; $i < $max; $i++) {
 if ($a[$i] == $b[$i]) {
 $equal .= $b[$i];
 }else {
 break;
 }
 }
 
 if (!$equal) return $equal;
 }
 
 return $equal;
 }
}