<?php //echo '<pre>';print_r($sArray);echo '</pre>';die; function findRepeatingStringCount($sArray) { $i = 1; $left = $sArray[0]; $right = $sArray[$i]; while ($i < count($sArray)) { if ($left == $right) { return $i; } $i++; $right = $sArray[$i]; } return 0; } $s = "pwwkew"; // string to array $sArray = str_split($s); echo '<pre>';print_r(findRepeatingStringCount($sArray));echo '</pre>';die; //abcabcbb //start index at 1 // l: a r: b // i=1 //l: a, r: c // i: 2
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