Develop Reference

Regarding Data table source data access

I have used the datatable ajax call for listing I received the below json data in ajax call:
{
"sEcho":1,
"iTotalRecords":"1",
"iTotalDisplayRecords":"1",
"aaData":[
["Demo to Mam","2"]
],
"countOfTotalRecords":2
}
How I can use the countOfTotalRecords var value on view page?

You've to decode your JSON data using json_decode, then you have an object. Looks something like this:
$json = '{"sEcho":1,"iTotalRecords":"1","iTotalDisplayRecords":"1","aaData":[["Demo to Mam","2"]],"countOfTotalRecords"
:2}';
$decode = json_decode($json);
echo $decode->countOfTotalRecords; // this will display 2, regarding your data

use the below code
$str = '{"sEcho":1,"iTotalRecords":"1","iTotalDisplayRecords":"1","aaData":[["Demo to Mam","2"]],"countOfTotalRecords":2}';
$arr = json_decode($str);
$tcount = $arr->countOfTotalRecords;
echo $tcount;

Get a php array into a js array

I want to get a php array made by pg_fetch_all in a javascript array. But when I try to do it, firebug tells me that I'm trying to convert an array to string. Indeed, I don't understand why because both are arrays.
Here is where I create the php array :
$conn_string = "host=localhost port=5432 dbname=test_postgre user=postgres password='1234'";
$dbconn = pg_connect($conn_string);
$sql = "SELECT ".$colonne." FROM public.".$tablevar."";
$res = pg_query($sql) or die("Pb avec la requete: $sql");
$data = pg_fetch_all($res);
And here is my js code :
var array_dropdown =[<?php echo $data;?>];
And it doesn't work. Please help me !

PHP Arrays 101: Arrays in a string context are the literal word Array:
$x = array(1 => 2);
echo $x; // ouputs "Array"
You need to use json_encode():
var array_dropdown = <?php echo json_encode($data); ?>;
json_encode guarantees that whatever you pass in to the encode function will be output as syntactically valid javascript. Note the lack of [] around the above code - json_encode handles all of that for you.

Assume this as your PHP array
$array = array('foo' => 'bar');
The JS part:
var array = <?php echo json_encode($array); ?>;

seperate each array value from array passed by ajax -- php

I passed an array using Ajax and i echoed it in php , it works good. But i don't know how to separate its value and find its length.
Here is the code:
var myCheckboxes = new Array();
$(".book_type:checked").each(function() {
myCheckboxes.push($(this).val());
});
$.post("s.php?c="+category+"&k="+myCheckboxes,{data : "some data"}, function(response){
$("#show_result").html(response);
And the php is:
$a=$_GET['k'];
echo $a;
it displays the values of all checkbox like this
all,0,1,2,3,4
How can i find $a length as array?. if i use sizeof($a) it shows as 1.
Also how to separate those values into each single value.
Any suggestion

try like this
$a=$_GET['k'];
$value= explode(",",$a);
echo sizeof($value); //output 6
echo $value[0]; //all
echo $value[1]; //0
echo $value[2]; //1
echo $value[3]; //2
echo $value[4]; //3
echo $value[5]; //4

Try using:
$a=$_GET['k'];
$a=explode(',', $a);
echo count($a);

Pass the value as an array
$.post("s.php", {
data: "some data",
c: category,
k: myCheckboxes
}, function (response) {
$("#show_result").html(response);
})
then
$a=$_GET['k'];
where $a will be an array, so count($a) should give you the length

You should call JSON.stringify in your javascript:
// ⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓
... category+"&k=" + JSON.stringify(myCheckboxes) ...
or, alternatively, use jQuery ajax syntax sugar in your post request:
$.post("s.php", { k: myCheckboxes, ... });
This will provide a json as string passed to controller. From within your controller you should json_decode the received parameters:
$a = $_GET['k'];
print_r(json_decode($a));
Hope this helps.

php decode json array

I have a php page that receives a json object from javascript page, but i was not able to decode the json in php. How to decode the json and store in php such that $arr[0]=[1,2,34,5,2]; $arr[1]=[2,1,34,5,2]; $arr[2]=[8,1,34,5,2]; in php ?
after removing "myString = JSON.stringify(myObject);"
echo $value; outputs "Array"
echo $value[0]; outputs nothing
echo $value->{"key"}; outputs nothing either
how can i actually get the array contents?
javascript:
var mon=[1,2,34,5,2];
var tue=[2,1,34,5,2];
var wed=[8,1,34,5,2];
var myObject = {'key' :'value','key2':'value','key3':'value'};
myObject.key = mon;
myObject.key2 = tue;
myObject.key3 = wed;
myString = JSON.stringify(myObject); //this line removed
var jsonString = JSON.stringify(myObject);
$.ajax({
type: "POST",
url: "n3.php",
data: {data : jsonString},
cache: false,
success: function(aaa){
alert("OK");
$("#pageContent").html(aaa);
}
});
php:
<?php
$value = json_decode($_POST['data']);
echo $value; //this echos the whole json object
echo $value->{"key"}; //this outputs nothing
?>

You are JSON encoding your data twice on the Javascript side. When you call json_encode in PHP once, you get a JSON encoded object back. That's why echo $value outputs the whole string. If it was a PHP array at this point it would output "Array" or an error in case it was an object, it would not output the whole content.
Either json_decode it again, or don't double encode it in Javascript.

How to create javascript array from database by php

I want to create a javascript array from databse like this:
var m = [
[one]
[two]
[three]
]
it is important that typeof m be object.

Use Json_encode
$phparray; // This is your php array
$jsArray = <?php echo json_encode($phparray); ?>;
//do stuff with $jsArray now