How to create a regular preg_replace for preg_replace to replace

  • IsActive => is_active
  • NewParamA => new_param_a
  • SNTest => s_n_test
  • ABC => a_b_c
  • ABCd => a_b_cd

That is, each under letter should be preceded by an underscore (except for the first letter).

    1 answer 1

     <? $str = 'ThisStringIsCamelCaseExample'; echo $str . ' / ' . strtolower(preg_replace('/(?<=.)[AZ]/', '_$0', $str)); ?> out: ThisStringIsCamelCaseExample / this_string_is_camel_case_example