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    <p><strong>@bumperbox</strong></p> <ol> <li><p>Your basic code needed some correction to work in ALL scenarios!</p> <ul> <li>Your loop only compares until one character before the last character!</li> <li>The mismatch can possibly occur 1 loop cycle after the latest common character.</li> <li>Hence you have to at least check until 1 character after your first string's last character.</li> <li>Hence your comparison operator must be "&lt;= 1" or "&lt; 2".</li> </ul></li> <li><p>Currently your algorithm fails</p> <ul> <li>if the first string is completely included in all other strings,</li> <li>or completely included in all other strings except the last character.</li> </ul></li> </ol> <p>In my next answer/post, I will attach iteration optimized code!</p> <p><strong>Original Bumperbox code PLUS correction (PHP):</strong></p> <pre><code>function shortest($sports) { $i = 1; // loop to the length of the first string while ($i &lt; strlen($sports[0])) { // grab the left most part up to i in length // REMARK: Culturally biased towards LTR writing systems. Better say: Grab frombeginning... $match = substr($sports[0], 0, $i); // loop through all the values in array, and compare if they match foreach ($sports as $sport) { if ($match != substr($sport, 0, $i)) { // didn't match, return the part that did match return substr($sport, 0, $i-1); } } $i++; // increase string length } } function shortestCorrect($sports) { $i = 1; while ($i &lt;= strlen($sports[0]) + 1) { // Grab the string from its beginning with length $i $match = substr($sports[0], 0, $i); foreach ($sports as $sport) { if ($match != substr($sport, 0, $i)) { return substr($sport, 0, $i-1); } } $i++; } // Special case: No mismatch happened until loop end! Thus entire str1 is common prefix! return $sports[0]; } $sports1 = array( 'Softball', 'Softball - Eastern', 'Softball - North Harbour'); $sports2 = array( 'Softball - Wester', 'Softball - Western', ); $sports3 = array( 'Softball - Western', 'Softball - Western', ); $sports4 = array( 'Softball - Westerner', 'Softball - Western', ); echo("Output of the original function:\n"); // Failure scenarios var_dump(shortest($sports1)); // NULL rather than the correct 'Softball' var_dump(shortest($sports2)); // NULL rather than the correct 'Softball - Wester' var_dump(shortest($sports3)); // NULL rather than the correct 'Softball - Western' var_dump(shortest($sports4)); // Only works if the second string is at least one character longer! echo("\nOutput of the corrected function:\n"); // All scenarios work var_dump(shortestCorrect($sports1)); var_dump(shortestCorrect($sports2)); var_dump(shortestCorrect($sports3)); var_dump(shortestCorrect($sports4)); </code></pre>
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