How to update the muliple values using array in PHP

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Javascript

PHP

MySQL

i have a tables eligibility and venue.eligibility table have multiple records i am passing using dynfields array for inserting data below is the code for inserting.Now i want to update the data.how can i do that.please help me thanks in advance.

$job_id = mysql_insert_id();
if ($_POST['dynfields']) {
           foreach ( $_POST['dynfields'] as $key=>$fieldArray ) {
                   $keys = array_keys($fieldArray);
                   $values = array_map("mysql_real_escape_string",$fieldArray);
                   $query = mysql_query("INSERT INTO `sk_c_eligibility` (".implode(',',$keys).",elg_job_id) VALUES ('".implode('\',\'',$values)."','$job_id')") or die(mysql_error());
           }
   }

What I have tried:

now i am trying to update those fields using like this.i dont know whether it should work or not .please help me.thanks in advance.

$job_id = mysql_insert_id();
if ($_POST['dynfields']) {
           foreach ( $_POST['dynfields'] as $key=>$fieldArray ) {
                   $keys = array_keys($fieldArray);
                   $values = array_map("mysql_real_escape_string",$fieldArray);
                   $query = mysql_query("UPDATE`sk_c_eligibility` SET (".implode(',',$keys).",elg_job_id) VALUES ('".implode('\',\'',$values)."','$job_id')") or die(mysql_error());
           }
   }