I'm passing some values with POST to another file.
One (or more) of those values are:
Equip1, Equip2, Equip3, ..., EquipN
I'm able to know how many EquipN I have, but not know how to get their values.
I thought this works, but it's not:
for ($Equip_aux=1; $Equip_aux<=$Number_of_Equip; $Equip_aux++) {
$aux = "'Equipamento".$Equip."'";
$VALUE = $_POST[$aux];
}
Any help, please?
I'm able to know how many EquipN I have, but not know how to get their values.
Here's the corrected version of your for loop:
for ($i = 1; $i <= $Number_of_Equip; $i++) {
$aux = "Equip$i";
$VALUE = $_POST[$aux];
}
Notice that you can also loop trough the post values with foreach:
foreach ($_POST as $p) {
...
}
Related
I am looking for a way to create new arrays in a loop. Not the values, but the array variables. So far, it looks like it's impossible or complicated, or maybe I just haven't found the right way to do it.
For example, I have a dynamic amount of values I need to append to arrays. Let's say it will be 200 000 values. I cannot assign all of these values to one array, for memory reasons on server, just skip this part.
I can assign a maximum amount of 50 000 values per one array. This means, I will need to create 4 arrays to fit all the values in different arrays. But next time, I will not know how many values I need to process.
Is there a way to generate a required amount of arrays based on fixed capacity of each array and an amount of values? Or an array must be declared manually and there is no workaround?
What I am trying to achieve is this:
$required_number_of_arrays = ceil(count($data)/50000);
for ($i = 1;$i <= $required_number_of_arrays;$i++) {
$new_array$i = array();
foreach ($data as $val) {
$new_array$i[] = $val;
}
}
// Created arrays: $new_array1, $new_array2, $new_array3
A possible way to do is to extend ArrayObject. You can build in limitation of how many values may be assigned, this means you need to build a class instead of $new_array$i = array();
However it might be better to look into generators, but Scuzzy beat me to that punchline.
The concept of generators is that with each yield, the previous reference is inaccessible unless you loop over it again. It will be in a way, overwritten unlike in arrays, where you can always traverse over previous indexes using $data[4].
This means you need to process the data directly. Storing the yielded data into a new array will negate its effects.
Fetching huge amounts of data is no issue with generators but one should know the concept of them before using them.
Based on your comments, it sounds like you don't need separate array variables. You can reuse the same one. When it gets to the max size, do your processing and reinitialize it:
$max_array_size = 50000;
$n = 1;
$new_array = [];
foreach ($data as $val) {
$new_array[] = $val;
if ($max_array_size == $n++) {
// process $new_array however you need to, then empty it
$new_array = [];
$n = 1;
}
}
if ($new_array) {
// process the remainder if the last bit is less than max size
}
You could create an array and use extract() to get variables from this array:
$required_number_of_arrays = ceil($data/50000);
$new_arrays = array();
for ($i = 1;$i <= $required_number_of_arrays;$i++) {
$new_arrays["new_array$i"] = $data;
}
extract($new_arrays);
print_r($new_array1);
print_r($new_array2);
//...
I think in your case you have to create an array that holds all your generated arrays insight.
so first declare a variable before the loop.
$global_array = [];
insight the loop you can generate the name and fill that array.
$global_array["new_array$i"] = $val;
After the loop you can work with that array. But i think in the end that won't fix your memory limit problem. If fill 5 array with 200k entries it should be the same as filling one array of 200k the amount of data is the same. So it's possible that you run in both ways over the memory limit. If you can't define the limit it could be a problem.
ini_set('memory_limit', '-1');
So you can only prevent that problem in processing your values directly without saving something in an array. For example if you run a db query and process the values directly and save only the result.
You can try something like this:
foreach ($data as $key => $val) {
$new_array$i[] = $val;
unset($data[$key]);
}
Then your value is stored in a new array and you delete the value of the original data array. After 50k you have to create a new one.
Easier way use array_chunk to split your array into parts.
https://secure.php.net/manual/en/function.array-chunk.php
There's non need for multiple variables. If you want to process your data in chunks, so that you don't fill up memory, reuse the same variable. The previous contents of the variable will be garbage collected when you reassign it.
$chunk_size = 50000;
$number_of_chunks = ceil($data_size/$chunk_size);
for ($i = 0; $i < $data_size; $i += $chunk_size) {
$new_array = array();
foreach ($j = $i * $chunk_size; $j < min($j + chunk_size, $data_size); $j++) {
$new_array[] = get_data_item($j);
}
}
$new_array[$i] serves the same purpose as your proposed $new_array$i.
You could do something like this:
$required_number_of_arrays = ceil(count($data)/50000);
for ($i = 1;$i <= $required_number_of_arrays;$i++) {
$array_name = "new_array_$i";
$$array_name = [];
foreach ($data as $val) {
${$array_name}[] = $val;
}
}
I want to get keys and values from a multi-dimensional array dynamically, to better explain what I'm trying to achieve please see the code below.
$i = 0;
foreach ($faq as $f) {
$q = 'faq'.$i;
$a = 'faq'.$i.'_answer';
echo $faq['faq1'][$i];
echo $faq['faq1_answer'][$i];
$i++;
}
The literal text above faq1 and faq1_answer needs to be replaced by the variable $q and $a respectively for me to be able to get the keys and values dynamically, but I cannot figure out how to add the variable.
The keys will always be the same, except for the number, which will change from 1 to 99. So with the code above, I can get the value of faq1 but I also need to grab the value of faq2 etc, hence why the variables above would work as I need.
tl;dr faq1 needs to be able to change to faq2 on the next iteration, hence the reason for me using $i.
Maybe like this?
$i = 0;
foreach ($faq as $f) {
$q = 'faq'.$i;
$a = 'faq'.$i.'_answer';
echo $f[$a];
echo $f[$a];
$i++;
}
How do I delete the whole line from an array? When the delete-button is pressed it should delete the whole line.
my array looks like that:
$liste[0][0] = email-user1
$liste[0][1]= password-user1
$liste[1][0] = email-user2
$liste[1][1]= password-user2
So if I delete the user one, the user2 should just take the place from user1(which should just disappear).
if (isset($_GET['delete'])){
$id=key($_GET['delete']);
for ($i = 0; $i < count($liste); $i++){
if ("$i"=="$id"){
unset($liste[$id][0]);
unset($liste[$id][1]);
unset($liste[$id][2]);
}
else{
}
}
update
I'm using array_splice($liste, $id, 1); now but everytime I try to save it to the file I get an error: implode(): Invalid arguments passed. For saving it to the file, I use the following function:
function saveDataToFile($fileName, $liste){
$file=fopen($fileName,"w");
for ($i = 0; $i < count($liste); $i++) {
$zArray=$liste[$i];
$zeile=implode("|", $zArray);
if(strlen($zeile) > 0){
$zeile=$zeile."\r\n";
fwrite($file, $zeile);
}
}
fclose($datei);
}
Try the below code:
$liste[0][0] = "email-user1";
$liste[0][1]= "password-user1";
$liste[1][0] = "email-user2";
$liste[1][1]= "password-user2";
$liste[2][0] = "email-user3";
$liste[2][1]= "password-user3";
unset($liste[1]); // say you want to delete this row
$new_arr = $liste;
unset($liste);
$i=0;
foreach($new_arr as $value){
$liste[$i] = $value;
$i++;
}
You can use array_splice() method:
array_splice($liste, $id, 1);
$liste[0][0], $liste[0][1] and $liste[0][2] are in real nothing else than a value array(value, value, value) (the inner array) which is assigned to $liste[0] (the outer array)
unsetting this (outer) array value $liste[0] is enough:
unset($liste[$id]);
If you care about the keys of this array (I see you loop from 0..n), you need to reindex your array using:
$liste = array_values($liste);
This will make your array behaving more like arrays normally do in other programming languages
Good practice is to use foreach instead of for. In this case you don't need to reindex:
for ($liste as $key=>$value){
if ("$key"=="$id"){
unset($liste[$key]);
}
But anyway you don't have to loop through an array just for finding a key. It's enough doing this:
if (isset($liste[$id])) { /* optional: check if the key exists */ }
unset($liste[$id]);
I am using a $_COOKIE[array] in order to save data for a single input. This input will only submit if the user entered the same value twice. For instance, if they submitted apple, then orange, then banana, then apple, the form would submit on the second appearance of "apple".
I read [this tutorial](
http://phpprogramming.wordpress.com/2007/03/06/php-cookies-tutorial-and-examples/).
for ($i = 1; $i < 10; $i++) {
if (!isset($_COOKIE[$i])) {
setcookie("query" . [$i],$query,time()+604800,"/");
break1;
}
}
foreach ($_COOKIE["query"] as $key => $value) {
echo "$key:$value";
}
I believe it might be a syntax error since I get:
Warning: Invalid argument supplied for foreach()
If you know a better way (can't be mySQL), then please let me know!
$_COOKIE["query"] is not an array, that's whats producing the error.
$_COOKIE['query'] can not store an array. This is also why you get an error when you try to use it in the foreach. You could serialize your array before saving it though. Something like this
$array = array();
for ($i = 1; $i < 10; $i++) {
$array[] = $i;
}
setcookie("query",urlencode(serialize($array)),time()+604800,"/");
$query = unserialize(urldecode($_COOKIE['query']));
foreach ($query as $key => $value) {
echo "$key:$value";
}
also have a look at this post update cookie value in php for the expalanation why the urlencode / urldecode is used
Let me know if you want more details but:
I have an different number of inserts I need to make based on a POST form data that I created in a loop.
If I were to write it all out it would look like this:
$Scout1=$_POST['ScoutID1'];
$Scout2=$_POST['ScoutID2'];
and it keeps going until it reaches "x" I do have that number stored as
$ScoutCount
(so if the above code would post all the variables I brought over {$ScoutCount=2}
I can't find a way to do:
while (X>0){
$ScoutX=$_POST['ScoutIDX'];
X--;
}
how can I do this?
You might be looking for variable variables
But rather, I would recommend storing the data in an array, as opposed to individual variables. Then in a for loop, it could look like:
$scouts = array();
for ($i = 0; $i < 10; $i++)
{
$scouts[$i] = $_POST['ScoutID' . $i];
}
or something.
instead of having form fields called ScoutID1, ScoutID2 wtc name them
name="ScoutID[]"
then you will have a nice array with work with
//put scoutIDs into Array
$scouts = array();
for ($i = 1; $i <= $ScoutCount; $i++)
{
$scouts[$i] = $_POST['ScoutID' . $i];
}
Thanks - that may have seemed easy but I wasted a day trying to figure it out. thanks from the newbie to Php....