Question

I am currently using php to help me find the valide and non-duplicated entry,

which i need

1. a list of valid and non-duplicated
2. entry a list of invalid input (unique)
3. a list of duplicate input

My approach is first create 5 array 2 for orginal ,1 for no mistake (empty),
1 for valid (empty) , 1 for duplicate (empty)

First using one of orginal array, for each one element : check valid
and check duplicate, if invalid , put into invalid array , and check duplicate by using inarray

after all, i get one array of invalid and duplicate , then using the orginal array, check which element is not in that two array. And job done.

My problem is, it seems quite inefficiency, how can i improve it? (Perferable if using some famous algorithm)

Thank you.

   // get all duplicate input and store in an array
    for ($row = 1; $row <= $highestRow; $row++) {
    for ($y = 0; $y < $highestColumn; $y++) {
        $val = $sheet->getCellByColumnAndRow($y, $row)->getValue();

//use reg exp to check whether it is valid
        if ($y == $mailColumn && !preg_match($pattern,$val))
        {$invaild[]=$row;}
//if valid, test whether it is duplicate
        elseif ($y == $mailColumn && in_array($val,$email))
        {$duplicate[]=$val;
        $duplicate[]=$row;}

        if ($y == $mailColumn)
        {$email[]=$val;
        $email=array_unique($email);}

      }
    }


// unique invalid array since i just need  invalid  inputs, not the invalid + duplicate input 
$invaild=array_unique($invaild);

Answer 1

try this:

<?php     
echo "<pre>";    

$array1 = array("[e-mail]","c","c","[e-mail]","test1","","test3","test2","test3");    

$array_no_mistake = array_filter($array1,function($subject){if(trim($subject)=="") return true;});    

$array_uniq = array_diff(array_unique($array1),$array_no_mistake);    

$array_dups = array_diff_assoc(array_diff($array1,$array_no_mistake),$array_uniq);    

$array_valid = array_filter($array_uniq,function($subject){    
    if (preg_match('/\A(?:[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z/i', $subject)) {    
    return true;    
} else {    
    return false;    
}    
});    


$array_invalid = array_diff_assoc($array_uniq,$array_valid);    


print_r($array1);    

print_r($array_no_mistake);    

print_r($array_uniq);    

print_r($array_dups);    

print_r($array_valid);    

print_r($array_invalid);    

?>