PHP Tutorial: PHP processing array mode to select the optional input multi-selection box

Generally from the data cycle out of the selection box to handle whether it is selected is to use if to judge, resulting in a heap of code, the speed is too slow.

I made a closure to share with everyone, hope to be useful to everyone.

Code:

1. function ifnumexists ($numList, $key) {
   
2. $return = false;
   
3. $arraylist = Split (",", $numList);
   
4. $Length = count ($arraylist)-1; The last array result is empty, so it should be subtracted.
   
5. for ($i =0; $i < $Length; $i + +) {
   
6. if ($arraylist [$i] = = $key) {
   
7. $return = true;
   
8. }
   
9. }
   
10. return $return;
    
11. }
    

How to use:

1. Ifnumexists (array, corresponding ID of the current radio box)
   

table structure:
Single selection box loop table (A):
ID class
1 Category 1
2 Category 2
3 Category 3
4 Category 4

Single Value deposit table (B):
ID ClassID
1 1,2,3,
2 2,3,4,
3 1, 2,

When loop table A determines whether the current input is selected, then we can use the
Ifnumexists (ClassID, table aid), returns a result of true or false, according to the results of the return we give input or do not increase checked= "checked".
Such as:

1. if (Ifnumexists (ClassID, $value [' ID '])) {
   
2. $list = $list. " <input type=\ "checkbox\" name=\ "sendnums[]\" "value=\" ". $value [' id ']." \ "checked=\" checked\ "/>". $value [' class ']. " </li> ";
   
3. }else{
   
4. $list = $list. " <input type=\ "checkbox\" name=\ "sendnums[]\" "value=\" ". $value [' id ']." \ "/>". $value [' class ']. " </li> ";
   
5. }
   
6. return $list;