I have a form that takes in data and writes to a JSON form in PHP.
I needed to submit an array as a numeric input but it keeps giving me a string. Is it possible to enable the form to submit as an array via text input box?
Form example:
<input type="text" name="arraytobepushed[]" placeholder="EG: 1000,2000,3000" />
The output is:
{
"obj": [{
"arraytobepushed": ["1000,2000,3000"]
}]
}
You could turn the text into an array by using explode() So you would have something like this:
<?PHP
$myArray = explode(',', $_POST['arraytobepushed[]']);
?>
The explode() function splits everything separated by the first argument (in this case a comma) you pass and puts it into an array.
So if your inputted was 1000, 2000, 3000 your $myArray would look like:
index 0 = "1000" ($myArray[0])
index 1 = "2000" ($myArray[1])
index 2 = "3000" ($myArray[2])
Keep in mind that the values are still strings, not integers. If you want to make them integers you can do this:
$myArray = array_map('intval', explode(',', $_POST['arraytobepushed[]']));
This makes all your elements into integers like so:
index 0 = 1000 ($myArray[0])
index 1 = 2000 ($myArray[1])
index 2 = 3000 ($myArray[2])
No. Forms submit text.
PHP special cases fields with [] in the name as fields to be expressed in an array. It has no special case feature to treat a field as a number instead of a string. You need to convert the data explicitly.
Related
I have the following JSON:
[
{
"0":"2019-08-31",
"1":"Bank Exp.",
"2":"AED",
"3":"30",
"4":"",
"5":"BANK FEE 10"
},
{
"0":"2019-08-31",
"1":"Inventory",
"2":"AED",
"3":"122",
"4":"",
"5":"DEPOSIT 10000"
},
{
"0":"2019-08-31",
"1":"Petty Cash",
"2":"AED",
"3":"4999",
"4":"",
"5":"DEPOSIT 10000"
}
]
I am trying to Count the number of elements or columns in the Json. The result should be 6.
I have tried with echo count($data_array); (or sizeof) result is 3 (number of rows). How can I count the "columns" in this Json, taking into account that I must set as number of column the Max number of column a specific row has?
Do I have to use a loop to count or can I do it with a single instruction?
Assuming that some var $json contains the JSON code you have above, you should be aware that the following code will result in an array of objects of type stdClass:
$data_array = json_decode($json);
So $data_array is in fact an array, but it contains objects. As you pointed out, this will return the number of rows in your JSON:
echo sizeof($data_array);
Clearly, the number of columns is not the number of rows. If you want to know the number of columns then you'll need to check one or more rows/objects/elements of your $data_array var. It's expedient to just look at the first element:
$col_count = sizeof($data_array[0]);
HOWEVER, this is going to cause an E_WARNING if $data_array's elements are objects of type stdClass:
PHP Warning: sizeof(): Parameter must be an array or an object that implements Countable in /tmp/foo.php on line 33
You could optionally use the second parameter of the json_decode function which will force PHP to decode every curly bracketed object in your JSON code as an associative array instead of stdClass objects:
$data_array = json_decode($json, TRUE);
$col_count = sizeof($data_array[0]);
This yields a $col_count value of6 which is the correct for the first object in your array. You should consider that later elements in $data_array may have either more or fewer columns, depending on the structure of your data. If you are sure that all elements will have the same number of columns, this is adequate, but if you have messy data, you may need to check every element of your data array to see what the true number of columns is:
$data_array = json_decode($json, TRUE);
$col_count = 0;
foreach($data_array as $row) {
$col_count = max($col_count, sizeof($row));
}
var_dump($col_count);
This will yield a $col_count value which reflects the maximum number of columns encountered in any element of your JSON. Clearly, there may be performance considerations if your JSON contains a large number of elements. It all depends on your JSON data and the nature of your application.
EDIT:
Instead of an explicit foreach loop, I think you can get away with this, but it will still require PHP to loop through your data structure. That said, it'll probably be faster:
$max_col_count = max(array_map("count", $data_array));
count($data_array) counts the number of elements in an array. In your case, is 3. But your array is multidimensional (matrix). So you need to count on some index to get the number of columns on that position:
<?php
echo count($data_array[0]);
Is it possible in php to change the name used to create an associative array? I am using mongo in php but it's getting confusing using array() in both cases of indexed arrays and associative arrays. I know you can do it in javascript by stealing the Array.prototype methods but can it be done in php my extending the native object? it would be much easier if it was array() and assoc() they would both create the same thing though.
EDIT -------
following Tristan's lead, I made this simple function to easily
write in json in php. It will even take on variable from within
your php as the whole thing is enclosed in quotes.
$one = 'newOne';
$json = "{
'$one': 1,
'two': 2
}";
// doesn't work as json_decode expects quotes.
print_r(json_decode($json));
// this does work as it replaces all the single quotes before
// using json decode.
print_r(jsonToArray($json));
function jsonToArray($str){
return json_decode(preg_replace('/\'/', '"', $str), true);
}
In PHP there is no "name used to create an associative array" or "name used to create an indexed array". PHP Arrays are ordered maps like in many other scripting languages.
This means that you can use an array whichever way you please.
If you wanted an indexed array..
$indexedArray = array();
$indexedArray[] = 4; // Append a value to the array.
echo $indexedArray[0]; // Access the value at the 0th index.
Or even..
$indexedArray = [0, 10, 12, 8];
echo $indexedArray[3]; // Outputs 8.
If you want to use non integer keys with your array, you simply specify them.
$assocArray = ['foo' => 'bar'];
echo $assocArray['foo']; // Outputs bar.
I know there are some similar questions but none of them solves my issue.
I have a simple form:
<form method="post">
Import data: <textarea type="text" name="import"></textarea>
<input type="submit">
</form>
Then I get data from the "import" field:
$current = my_data();
$import = $_POST['import'];
$merge = array_merge($current,$import);
The problem is, even if I paste:
array('foo' => 'bar')
I get:
Warning: array_merge(): Argument #2 is not an array in
(address)
on line (line)
I can't change the HTML markup and I have to paste arrays there. Any ideas how to fix it? I've been reading about serialize() but not sure if there's anything to serialize is array() is not array() for PHP. Why is that? Any solutions? Thanks a lot!
UPDATE
$current hold an array of options for my theme.
$merge is supposed to hold the same keys with different values (around 30-50 of them, not multidimensional but might be in the future), but of course users might add new ones so in order to ignore them I'm actually using:
$imported_options = array_merge($current_options , array_intersect_key($_POST["import"], $current_options ));
(simplified this one as it's just an example)
So after all I want to load an array from the form and update the other array with it.
PHP will not create arrays in $_GET/$_POST unless you tell it to:
Import data: <textarea type="text" name="import[]"></textarea>
^^---- need these
Without the [], PHP will treat any duplicate field names as strings to be overwritten. With [] in the name, PHP will treat them as new elements in an array.
You can do
$current['import'] = $import;
Or you can change your html this way:
<textarea type="text" name="myarray['import']"></textarea>
And in php:
$import = $_POST['myarray'];
The second argument is not an array.
$_POST['import'] = value received from the form.
With that said, try:
$current [] = $_POST['import'];
What are you trying to get from $_POST['import'] ?
you are using a textarea to get an array?
if it's just a single variable then use array_push
http://php.net/manual/es/function.array-push.php
for array_merge you need to have 2 arrays.
I would like to perform massive content replace for some data called from mysql db in a php file.
Firstly, I have prepared an replacement array for content replace:-
$replacement_array = array(
"###123###" => "hello",
"###456###" => "great",
"###789###" => "ok"
);
Secondly, I call data from mysql db, the data would look like this:-
$data = "<input type="text" name="field1" value="###123###"><input type="text" name="field2" value="###789###">";
Thirdly, refer to the array, check up if $data contains any matched value in $replacement_array (this is the black box I wish to consult).
Fourthly, after content replacement, the resulting $data would become this:-
$data = "<input type="text" name="field1" value="hello"><input type="text" name="field2" value="ok">";
I guess the above will involve php in_array(), str_replace() and preg_match(), and I guess the flow may be like this:-
1) use explode() function to chop $data into a new $data_array by ###;
2) check values in $data_array is in_array() of $replacement_array;
3) if in_array(), carry out str_replace(); (in the above example there will be 2 times)
4) $data has proceeded 2 times of content replace, and ready to be used.
if the above steps 3) and 4) are carried out step by step, I it will be easy, however, if I wish to do it in 1 time, how shall I handle it?
You can use str_replace with first parameter as search array and second parameter as replace array.
$arr = array("###123###","###456###","###789###");
$arr1 = array("hello","great","ok");
str_replace($arr,$arr1, $data);
I currently have var: $_REQUEST['fb_friend_uid'] which gives me the following output:
Array{"returned_val":["47483647","47483647","47483647","665414807","263901486","665414807","665414807","665414807"]}
Im looking to save the data here into a new array, containing only the numbers in a format of; 47483647, 47483647, etc
The objective is to use it in a sql query like so:
SELECT * FROM vote WHERE
vote_fb_uid IN ($myNumbers)
Saving it into a new array I figured could be done like so:
foreach ($_REQUEST['fb_friend_uid'] as $uid) {
$uids[] = $uid['id'];
}
$ids = join(',', $uids);
However my issue remains, how to "clean" the first var to contain numbers only.
Suggestions?
I can't give you an exact solution, because I'm not sure if the value returned by $_REQUEST['fb_friend_uid'] is a PHP array printed using json_encode(), or the value is actually a json string.
In either case, where is an example which makes use of both circumstances, so use whichever one makes sense in your scenario:
If PHP Array:
Assumes PHP Array has a format similar to:
array('returned_val' => array('47483647', '47483647', '47483647', '665414807', '263901486', '665414807', '665414807', '665414807'));
<?php
$original_arr = $_REQUEST['fb_friend_uid']['returned_val'];
If JSON String:
Assumes the JSON String has a format similar to:
{"returned_val":["47483647","47483647","47483647","665414807","263901486","665414807","665414807","665414807"]}
<?php
$json_arr = json_decode($_REQUEST['fb_friend_uid'], True);
$original_arr = $json_arr['returned_val'];
Then, use this code:
<?php
// Extract only whole number values, omit anything which is not a 0-9 character.
$filtered_arr = array_filter($original_arr, 'ctype_digit');
// Escape values to remove possibility of SQL injection.
$filtered_arr = array_map('mysql_real_escape_string', $filtered_arr);
// Convert the array to a string
$string_arr = "'" . implode("','", $filtered_arr) . "'";
// Perform SQL Query
mysql_query("SELECT * FROM vote WHERE vote_fb_uid IN ($string_arr)");
Just filter the array using is_numeric:
$uids = array_filter($_REQUEST['fb_friend_uid'], 'is_numeric');
To filter for numbers you can use is_numeric( mixed $var ).
But if you need more control (only integers of certain type, length) you can either use REGEX or is_numeric and some ifs.
This looks like a json string, so use http://php.net/json_decode
Maybe you need to remove Array at the beginning (but I don't know if Array is actual in the variable), use http://php.net/substr
$jsonString = substr($_REQUEST['fb_friend_uid'], 5);
$fb_friend_uid = json_decode($jsonString);
$ids = join(',', $fb_friend_uid['returned_val']);