Sorry for a slight duplication of Q but I think the previous answers are now depreciated (I've seen that in PHP 5.3 you need you use MySQLi_fetch_array())
I'm using jpgraph and trying to pull my data from a MySQL database. I have the following code which pulls the figures I need and when I echo the result it spits out the answers one by one no problem but it won't then put it into an array.
I'm trying to replace a line which is
$ydata = array(1,2,3,4,5,6,7);
//query
$sql = "SELECT CONCAT( 'Week ', WEEK( TimeofCompletion ) , ' ', YEAR( TimeofCompletion ) ) AS Week, Count( * ) AS VolumeOfAnswers
FROM table01
GROUP BY WEEK( TimeofCompletion ) , YEAR( TimeofCompletion )
ORDER BY TimeofCompletion";
$ydata = array();
while($row = mysql_fetch_array($sql)){
// Create a temporary array
$temp = array();
$temp[] = "".$row['VolumeOfAnswers']."";
$ydata = '['. implode(', ', $temp) . ']';
}
Any suggestions how I would get the output by row into an array?
Regards
Maudise
$temp[] = "".$row['VolumeOfAnswers'].""; //what this suppose to do?
i assume you want quotes around i would add single quote inside
$temp[] = "'".$row['VolumeOfAnswers']."'";
otherwise you dont need double quotes at all so i would remove them. After that your array will hold the values from the database.
according to documentation mysql_fetch_array is deprecated and you should be using PDO or MySQLi. But if you still want to use it, i would suggest using mysql_fetch_assoc instead.
Now about the question:
while($row = mysql_fetch_array($sql)){
// Create a temporary array
$temp = array();
$temp[] = "".$row['VolumeOfAnswers']."";
//why is this here? should be outside of while loop shouldnt it?
$ydata = '['. implode(', ', $temp) . ']';
}
your $ydata always gets overwritten and holds only the last element of $temp array. Either move $ydata outside of while loop or use array_merge($ydata, $temp);
Related
I'm running a query to display an array. After the array is displayed I'm using that in Google Maps so the array needs to read a specific way.
var addresses = ['Norway', 'Africa', 'Asia','North America','South America'];
So my array has to read array', 'array', 'array because I echo the array into the address.
var addresses = ['<?php echo $namelist ?>'];
This is my code and it outputs 'array', 'array', 'array',
$resultsearch = $con->query("SELECT * FROM db") or die(mysqli_error());
$name = array();
while ($result = $resultsearch->fetch_object()) {
$name[] = $result->name;
$namelist = substr("'".implode($name)."', ", 0, -1);
If I change the 0, -1 to 1, -2 then I'm left with array' array' array' and so forth.
I literally need the remove 1 character from the end of string and 1 character at the beginning without altering the characters of the array.
Just to add that using implode(',', $name); did not display the ',' which is why I'm trying to find a work around.
Any ideas?
Your problems are:
You use implode(); in the wrong way: right is implode("', '",$names);
substr() will not work because of wrong use of implode().
Tip: Instead of using substr() just do rtrim('value',',');
To fix your code change it to this:
$name[] = "'{$result->name}'";
$namelist = implode(', ',$name);
or this
$name[] = $result->name;
$namelist = implode("', '",$name);
And this too:
var addresses = [<?php echo $namelist ?>];
to get proper javascript/json array data.
Also works:
var addresses = <?php echo json_encode($namelist); ?>;
But here you should not add ' single-quotes to the names when collecting into an array.
Have a nice day
I ended up with $namelist = "'".$result->name."'," and then echo $namelist;
My results were addresses and believe that implode(',', $name) wouldn't work because of the results.
After pulling in some data from a mysql database saving it to a variable, I'm wondering if it's possible to "query" the variable instead of doing another request to the database? I realise I need to search an array of objects based on key and value. So here is an example of what I have.
<?php
[{"customer":1,"item":1,"bought_at":"2016-12-15 11:41:11"},
{"customer":2,"item":1,"bought_at":"2016-12-15 11:43:21"},
{"customer":3,"item":1,"bought_at":"2016-12-16 13:31:11"},
{"customer":1,"item":2,"bought_at":"2016-12-16 12:12:21"},
{"customer":1,"item":3,"bought_at":"2016-12-17 15:13:58"}]
?>
So lets say I need to search it based on the item number and the date (but not time) when the item was bought. The next step would be to return the result as another array of objects. So if I were to search for item 1 bought at 2016-12-15 it would return.
[{"customer":1,"item":1,"bought_at":"2016-12-15 11:41:11"},
{"customer":2,"item":1,"bought_at":"2016-12-15 11:41:21"},]
Is this possible? If so how would I go about doing it?
Regards
EDIT: The reason I originally asked this question was because I had a query inside a nested foreach loop which bothered me. It's a piece of code that builds up a a json table at the back-end to pass information to the front end to draw a google line graph. Also I changed the data slightly in my original question to try to make it easier to read. It's also built in Laravel. The complete code is pretty large so I'm just posting the nested foreach loops. The query is in the second loop and is given the variable $activations.
foreach ($timeRange as $time){
$temp = array();
$timeTwentyFour = date("G", strtotime($time));
$temp[] = array('v' => "Date(01,01,2000,$timeTwentyFour)");
foreach($data as $row){
$count = 0;
$activations = DB::table('customer_display')->where('display_id',$row->id)->where(DB::raw('DATE(created_at)'),$day)->get();
foreach($activations as $activation){
$timestamp = $activation->created_at;
$activationTime = explode(" ", $timestamp)[1];
if (strtotime($activationTime) >= strtotime($time) && strtotime($activationTime) < strtotime($time) + 3600){
$count++;
};
}
$temp[] = array('v' => (float) $count);
//The custom tooltip
$temp[] = array('v' => $time . ' ' . $row->location . '. ' . $count . ($count == 1 ? ' Activation' : ' Activations'));
}
$rows[] = array('c' => $temp);
}
If those are objects in an array and you only wanted the entries where item is 1 you could use array_filter;
$filtered = array_filter($items, function($item){
// only return objects where this is true
return $item->item == 1;
});
If you wanted only items purchased on the 15th use
return date('d', strtotime($item->bought_at)) == 15;
and if you want to see items 1 bought on the 15th you'd use
$filtered = array_filter($items, function($item){
return $item->item === 1
&& date('d', strtotime($item->bought_at)) == 15;
});
Also check out this answer on comparing dates for more information on how to better do that.
Another database request will be the better approach in most cases. A database is optimized for querying data. It can use indexes, etc. Well known databases like MySQL have a query optimalisation. Doing it by hand will be less efficient.
First downloading too much data and then use something like array_filter to linearly search through all the data is far less efficient than just querying the data with the search criteria in the query.
One way to do it is:
//Prepare statement once
$statement = $pdo->prepare("SELECT * FROM table WHERE item = ? AND bought_at = ?");
$statement->execute(array(1, "2016-12-15"));
foreach ($statement->fetchAll() as $array)
//Do something with $array
//reuse prepared statement with another selection criteria
$statement->execute(array(3, "2016-12-16"));
foreach ($statement->fetchAll() as $array)
//Do something with $array
I am a newbie in this and I have read lots of stuff about this matter (including some topics here), before starting this topic, but I do not quite get it yet, so I will ask for some help (if it is possible) :)
So, in the column that I want to print I have values like this on every row:
value1|value2|value5|value12|value25
value3|value5|value12|value14|value26|value32|value55
value1|value2|value14|value26|value31
The number of rows can be 3 or 1500+... So I want to merge the arrays and print those values sorted and without duplicates: value1, value2, value3, value5, value12, etc...
I have tried to explode the arrays, but I could not find out how to assign a variable to every array and merge them and all I have done is to print all values:
foreach ($rows as $areas) {
foreach (explode('|', $areas->value) as $area) {
var_dump($area);
}
}
Afterwards I have read somewhere this will be very slow if I have many rows (and I am going to have thousands), so I am stuck here and I do not know what else I could do...
I will appreciate any help and direction that you can give me, because it is too hard for me and I can not do it without help
Thank you in advance
You can store each value of your exploded string as key (if it's not an object nor array), it store only unique values. Then you have to just use array_keys() to get keys and sort returned array:
$rows = array(
'value1|value2|value5|value12|value25',
'value3|value5|value12|value14|value26|value32|value55',
'value1|value2|value14|value26|value31'
);
$results = array();
foreach ($rows as $row) {
$items = explode('|', $row);
foreach ($items as $item) {
$results[$item] = 0;
}
}
$results = array_keys($results);
sort($results, SORT_NATURAL);
Live demo on eval.in
There are two ways of doing this:
<?php
$str = 'value1|value2|value5|value12|value25';
$str1 = 'value3|value5|value12|value14|value26|value32|value55';
$str2 = 'value1|value2|value14|value26|value31';
//-- Method 1: Concat and make a single string and then explode and make a single array
$finalString = $str . '|' . $str1 . '|' . $str2;
print_r(array_unique(explode('|', $finalString)));
//-- Method 2: explode first and then merge into a single array
$strArr = explode('|', $str);
$strArr1 = explode('|', $str1);
$strArr2 = explode('|', $str2);
print_r(array_unique(array_merge($strArr, $strArr1, $strArr2)));
i have to update two different tables when submitting a form.
first one is a string containing all hotels information for each posted date
$index = 0;
$insert ="";
foreach($_POST['day'] as $index => $day) {
$day = $day;
$name = $_POST['name'][$index];
$sgl = $_POST['sgl'][$index];
$dbl = $_POST['dbl'][$index];
$nights = $_POST['nights'][$index];
$status = $_POST['status'][$index];
$ref = $_POST['ref'][$index];
$breakfast = $_POST['breakfast'][$index];
$meal = $_POST['meal'][$index];
$insert .= "$day|$name|$sgl|$dbl|$nights|$status|$ref|$breakfast|$meal;";
}
$data['details_accommodation'] = $insert;
This code works ok to update the first table.
i need then to isolate each $day (mysql date) and update a second year table with the same string where $day matches the corresponding date. and i'm stuck. hope i'm clear enough with mu problem !
Instead of Inserting DAY, try to insert UNIX timestamp, in both tables. Hope this resolves your problem
I'd much rather use arrays, and the implode function to join the values, rather than string concatenation. It gives far more flexibility with the values then, and no trailing join value set with the final loop.
My advice: Gather your your data into multiple arrays indexed by "$index", e.g:
$refs[$index] = $value
Then use the implode function to do your concatenation values:
$string = implode(',', $refs);
This will then simplify data arrays for you to manipulate and save. Hope this helps!
I have an array holding this data:
Array (
[1402377] => 7
[1562441] => 7
[1639491] => 9
[1256074] => 10
)
How can create a string that contains the keys of the above array?
Essentially, I need to create a comma separated string that consists of an array's keys
The string would look like: 'key','key','key'
Do I need to create a new array consisting of the keys from an existing array?
The reason I need to do this is because I will be querying a MySQL database using a WHERE in () statement. I would rather not have to query the database using a foreach statement. Am I approaching this problem correctly?
I've tried using a while statement, and I'm able to print the array keys that I need, but I need those keys to be an array in order to send to my model.
The code that allowed me to print the array keys looks like this:
while($element = current($array)) {
$x = key($array)."\n";
echo $x;
next($array);
}
$string = implode(',', array_keys($array));
By the way, for looping over an array consider not using current and next but use foreach:
foreach ($array as $key => $value) {
//do something
}
This will automatically iterate over the array until all records have been visited (or not at all if there are no records.
$keys = array_keys($array);
$string = implode(' ',$keys);
In your case, were you are using the result in a IN clause you should do:
$string = implode(',', $keys);
$yourString = '';
foreach($yourArr as $key => $val) {
$yourString .=$key.",";
}
echo rtrim($yourString, ",");
//OR
$yourString = implode(",", array_keys($yourArray));
See : array_keys
implode(', ', array_keys($array));
Use php array_keys and implode methods
print implode(PHP_EOL, array_keys($element))
The string would look like: 'key','key','key'
$string = '\'' . implode('\',\'', array_keys($array)) . '\'';
Imploding the arguments and interpolating the result into the query can cause an injection vulnerability. Instead, create a prepared statement by repeating a string of parameter placeholders.
$paramList = '(' . str_repeat('?, ', count($array) - 1) . '?)'
$args = array_keys($array);
$statement = 'SELECT ... WHERE column IN ' . $paramList;
$query = $db->prepare($statement);
$query->execute($args);