Update Function for all table update in php - php

Question

I have written a update function for all tables in php.It works in a very better way .but i think the function is too long . can you please help me to minimize it.Or can you suggest any other easy techniques or methods.
This is my update function
function updatetbl($a,$b,$c)
{
$a=self::data($a);//calling function inside the function
$a.="'WHERE ";
$c=self::data($c);
$c.="'";
$SQL="Update $b set $a $c";
$result=mysqli_query($SQL);
return $result;
}
Where a is data as array ,b is table name,and c is condition.
function data($a)
{
$fields=$a;
$data="";
$separator = '';
foreach($fields as $key=>$value)
{
$data .= $separator . $key . '=\'' . $value;
$separator = '\',';
}
return $data;
}

Answer 1

Use array_walk to loop over the array elements, and implode to combine them into a string.
You also should be using mysqli_real_escape_string() to prevent SQL-injection.
function data($a, $dbcon) {
return implode(', ', array_map(function($val, $column) use($dbcon) {
return "`$column` = '" . mysqli_real_escape_string($dbcon, $val) . "'";
}, $a);
Then you use it like this:
function updatetbl($dbcon, $table, $fields, $wheres) {
$where_string = empty($wheres) ? '' : "WHERE " . self::data($wheres);
$fields_string = self::data($fields);
return mysqli_query($dbcon, "UPDATE `$table` SET $fields_string $where_string";
}
Note that you were missing the first argument to mysqli_query(), the database connection.