Question

How can insert values on input in database mysql by json_encode and foreach, this html code and php code don’t work true and done insert value incomplete in database table as: “[” Or “1”

DEMO: http://codepad.viper-7.com/LAOJXC

I want they as in database table row:

           Column data_1           | Column static
Row1: ["1111111111", "2222222222"] | 12
Row2: ["3333333333", "4444444444"] | 34
Row1: ["5555555555", "6666666666"] | 56

<input name="data_1[]" value="1111111111">
<input name="data_1[]" value="2222222222">
<input name="static[]" value="12">

<input name="data_1[]" value="3333333333">
<input name="data_1[]" value="4444444444">
<input name="static[]" value="34">

<input name="data_1[]" value="5555555555">
<input name="data_1[]" value="6666666666">
<input name="static[]" value="56">

$data = array();
$data_1 = json_encode($_POST[data_1]);
$static = $_POST[static];
foreach($static as $idx=>$val){
    $data[] = array(
              'data_1' => $data_1[$idx],
              'static' => $static[$idx]
                   )
}

$this->db->insert_batch('MyTable', $data);

Answer 1

The reason why your code only inserts single characters to the database is because you convert the array $_POST['data_1'] to a string using json_encode() and then try to access this string as an array later.

When you access a string with the square brackets notation (in your code: $data_1[$idx]), PHP interprets this as a character-access in the string, resulting in only a single character.

From the PHP manual:

Characters within strings may be accessed and modified by specifying the zero-based offset of the desired character after the string using square array brackets, as in $str[42]. Think of a string as an array of characters for this purpose.

Look at this working example:

<form method="post">
<input name="data_1[]" value="1111111111">
<input name="data_1[]" value="2222222222">
<input name="static[]" value="12">

<input name="data_1[]" value="3333333333">
<input name="data_1[]" value="4444444444">
<input name="static[]" value="34">

<input name="data_1[]" value="5555555555">
<input name="data_1[]" value="6666666666">
<input name="static[]" value="56">
<input type="submit">
</form>

<?php
$data = array();
$data_1 = $_POST['data_1'];
$static = $_POST["static"];
foreach($static as $idx=>$val){
    $data[] = array(
              'data_1' => json_encode(Array($data_1[$idx*2],$data_1[$idx*2+1])),
              'static' => $static[$idx]
                   );
}
echo "<pre>";
print_r($data);
?>

DEMO http://codepad.viper-7.com/ca51ZB