PHP sorted by array length, do not change the location algorithm, teachers please help, how to deal with

PHP sorted by array length, do not change the location algorithm, please help the teacher

PHP Code

  
   $arr = Array (' Cervical erosion ', ' treatment ', ' treatment of the cervix ', ' cervix ', ' erosion ', ' How to treat ', ' how ', ' How ' to cure the cervix ', ' how ', ' How to treat ', ' Palace of the Mi '); function Arrlenorder_desc ($a, $b) {    if (strlen ($a) = = strlen ($b))  return 0;    Return (strlen (strip_tags ($a)) < strlen (Strip_tags ($b)))? 1:-1;} Usort ($arr, "Arrlenorder_desc"), Echo Implode (",", $arr);/* Output *///How to treat, cervical erosion, how to treat, treat cervix, cure cervix, treatment, how, Gong, how, erosion, cervix/* But the result I want is (that is, if the length does not change the original order): *///cervical erosion, treatment of the cervix, how to treat, how to treat, cure the cervix, treatment, cervix, erosion, how, how, Gong

------Solution--------------------
Is it bad to change the data? All women are sick.

PHP code

 $arr = Array (' Cervical erosion ', ' treatment ', ' treatment of the cervix ', ' cervix ', ' erosion ', ' How to treat ', ' How ', ' cure the cervix ', ' how ', ' How to treat ', ' Palace of _k '); $a = Array_keys ($arr); $a _v = Array_map (create_function (' $item ', ' return strlen ($item); ') , $arr); Array_multisort ($a _v,sort_desc,sort_numeric, $a _k,sort_asc,sort_numeric, $arr); Echo implode (",", $arr); 
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