MySQL query not inserting data - php

Question

I'm in a bit of a pickle here, its just that I'm trying to enter some data that I get from users into a table, but for some reason it won't let me insert the data, however I have exactly the same query for another part of the table and that seems to work perfectly fine.
for example when I execute this query, it doesn't work:
$updateibtask2 = "UPDATE ibtask_task2_75beep SET
Trial1_tone_actual= '$taskerror[0]', Trial2_tone_actual= '$taskerror[1]', Trial3_tone_actual= '$taskerror[3]',
Trial4_tone_actual= '$taskerror[4]', Trial5_tone_actual= '$taskerror[5]', Trial6_tone_actual= '$taskerror[6]',
Trial7_tone_actual= '$taskerror[7]', ... WHERE user_id = '$memberid'";
However, when I try this query it works perfectly fine:
$updateibtask2_estimate = "UPDATE ibtask_task2_75beep SET
Trial1_tone_estimate= '$taskerror[0]', Trial2_tone_estimate= '$taskerror[1]', Trial3_tone_estimate= '$taskerror[3]',
Trial4_tone_estimate= '$taskerror[4]', Trial5_tone_estimate= '$taskerror[5]', Trial6_tone_estimate= '$taskerror[6]',
Trial7_tone_estimate= '$taskerror[7]', ... WHERE user_id = '$memberid'";
I'm just wondering where I'm going wrong?
Also if it helps the PHP code that I'm using to run these queries are:
$task2 = array();
$task2 = $_SESSION['task2'];
$task2estimate = array();
$task2estimate = $_SESSION['estimatedpress2'];
$task2actual = array();
$task2actual = $_SESSION['actualpress2'];
addacutalerror_75($memberid, $task2actual);
addestimatederror_75($memberid, $task2estimate);
Also to check whether there was data present for $task2actual I had done an echo ..[0], .. [1].. etc and there was data present in the array.
Updated
For those who are searching for solutions and have the same problem, here's what I did:
function addacutalerror_75($memberid, $task2actual) {
$insertmember = "INSERT INTO ibtask_task2_75beep (user_id, Trial1_tone_actual,
Trial2_tone_actual, Trial3_tone_actual, Trial13_tone_actual,
Trial14_tone_actual, ..., Trial40_notone_actual) VALUES ('$memberid', '$task2actual[0]', '$task2actual[1]', '$task2actual[3]', '$task2actual[18]', '$task2actual[21]', '$task2actual[22]', '..., '$task2actual[24]', '$task2actual[29]', '$task2actual[33]','$task2actual[38]' )";
mysql_query($insertmember) or die(mysql_error());
}

Answer 1

by the way, UPDATE is very different from INSERT.
UPDATE - modify the existing record(s) on the table.
INSERT - adds new record(s) on the table.
Your query is fine but you are doing update. But you want to insert record not to update record right? The query when you insert record looks like this,
$updateibtask2 = "INSERT INTO ibtask_task2_75beep
(Trial1_tone_actual, Trial2_tone_actual,
Trial3_tone_actual,...)
VALUES ('$taskerror[0]', '$taskerror[1]',...)";
and your query is vulnerable with SQL Injection. Please take time to read the article below to protect against SQL injection,
Best way to prevent SQL injection in PHP?