I would like to check many rows of the same 2 input fields in a form. The validation should fail if one is empty and the other is not.
I have created an associative array based on several input fields(e_me_id, e_md_number, e_md_id1,e_md_number1, p_me_id,p_md_number...) in a form.
$pattern='(md_number|me_id)';
foreach($_POST as $field => $value) {
$success = preg_match($pattern, $field);
if ($success) {
$validate += [$field => $value];
}
}
result of validate =(
[e_me_id] => 1
[e_md_number] => 111
[e_me_id2] => 2
[e_md_number2] => 222
[p_me_id] => 10
[p_md_number] => 101010
[f_me_id] => 16
[f_md_number] => 161616
[d_me_id] => 18
[d_md_number] => 181818 )
I need some looping php to check that the first/second are both null or both filled... same for third/forth, fifth/sixth... etc etc.
I tried to use prev($validate) and next($validate) but could not get it to work.
Any ideas or a different approach.
Thanks in advance.
You can do this to do the validation of pairs:
// assuming this is the array generated by your code ...
$tst= array("e_me_id" => 1,"e_md_number" => 111 ,
"e_me_id2" => 2,"e_md_number2" => 222 ,
"p_me_id" => 0,"p_md_number" => 101010 ,
"f_me_id" => 16,"f_md_number" => 161616 ,
"d_me_id" => 0,"d_md_number" => 0 );
// then this will do the validation of pairs:
$keys=array_keys($tst);
for ($i=0;$i<count($tst);$i+=2)
echo "$keys[$i] and "
.$keys[$i+1]
.(empty($tst[$keys[$i]]) == empty($tst[$keys[$i+1]])?'':' DO NOT')
." pass the validation.\n";
You can see a demo here: https://rextester.com/VEMUFJ14979
I changed a few of the numbers to demonstrate the different possible cases.
Using the ==
operator between the two empty()
-tests is equivalent to using the negated xor
operator as suggested by @Markus Zeller.
Edit :
A "shorthand-if statement" should look something like this:
$x = (empty($tst[$keys[$i]]) == empty($tst[$keys[$i+1]])?'':$fieldname);
Although to me it is not quite clear what you intend $x
and $fieldname
to be in your for
-loop. This would set $x
to ''
if case both tested values were empty or both were "filled" and it would set it to $fieldname
when only one of them was empty.
Your most recent comment led me to believe that you want to have an overall validation result in $x. In order to get this you will have to count all errors while looping over the pairs. Something like the following should do that:
for ($i=0,$x=0;$i<count($tst);$i+=2){
if (empty($tst[$keys[$i]]) != empty($tst[$keys[$i+1]])) $x++;
// echo $keys[$i].", error count so far: $x\n";
}
echo ("here ".($x?'validation error!':'OK'));
See the demo here: https://rextester.com/XTK88037
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