下划线转驼峰

snakeToCamelCase.php

<?php

function snakeToCamelCase($string){
  $result      = '';
  $subIndexArr = explode('_', $string);
  foreach ($subIndexArr as $index => $temp) {
      if ($index === 0) {
          $result .= $temp;
      } else {
          $result .= ucfirst($temp);
      }
  }
  return $result;
}