How can I achieve this in Array in PHP - php

Question

am having problem achieving this result with array, I want to update another empty array with data in first array in such a way that the first two rows is ommitted and the first 3rows is added to the index 0 of the empty array, and the next 3 rows is also updated to the second index and so on. I have this Array in
`$arr = [
'tqty' => 9,
'tPrice' => 18700,
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000,
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000
];`
I want to use this array data and update another empty array this way, removing the first two rows
$arr2 = [
0 => [
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000
],
1 => [
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000
]
];
here is my code so far
$arr = [
'tqty' => 9,
'tPrice' => 18700,
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000,
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000
];
$newdat = [];
$count = 0;
$oldcount = 1;
foreach($arr as $key => $value){
if(preg_match_all('!\d+!', $key, $matches)){
if($oldcount == $matches[0][0]){
$newdat[$matches[0][0]] = [
$count => [
$key => $value
]
];
} else{
$count = 0;
$oldcount = $matches[0][0];
}
}
$count++;
}
I hope I get help soon. thanks

Answer 1

Assuming the array keys and order stay consistent you could use array_chunk
<?php
$inArray = [
'tqty' => 9,
'tPrice' => 18700,
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000,
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000,
];
$outArray = [];
// Remove first 2 values.
$inArray = array_slice( $inArray, 2 );
// 'Chunk' the rest of the values.
// true preserves keys.
$outArray = array_chunk( $inArray, 3, true );
echo '<pre>' . print_r( $outArray, true ) . '</pre>';
/**
Output:
<pre>Array
(
[0] => Array
(
[food_name_1] => Black Coffee
[food_quanty_1] => 1
[food_price_1] => 1000
)
[1] => Array
(
[food_name_2] => Sub Combo
[food_quanty_2] => 2
[food_price_2] => 3000
)
)
</pre>
*/

Answer 2

If I have understood you correctly,
$newdata = array();
for ($i = 1; $i++;) { // Intentionally no condition set.
if (array_key_exists('food_name_' . $i, $arr)) {
$temparray = array();
$temparray['food_name_' . $i] = $arr['food_name_' . $i];
if (array_key_exists('food_quanty_' . $i, $arr)) {
$temparray['food_quanty_' . $i] = $arr['food_quanty_' . $i];
}
if (array_key_exists('food_price_' . $i, $arr)) {
$temparray['food_price_' . $i] = $arr['food_price_' . $i];
}
$newdata[] = $temparray;
} else {
break; // break out of the loop
}
}
echo "<pre>";
print_r($newdata);
echo "</pre>";
die();

Answer 3

Loop through it and build the array index string via variables.
<?php
$arr = [
'tqty' => 9,
'tPrice' => 18700,
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000,
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000
];
foreach(array("food_name_","food_quanty_","food_price_") as $v){
// replace the set value of 2 here with a count() on the $arr
// and some basic math - IF you are always sure you'll have 3 fields
for($i=0;$i<2;$i++){
$newarr[$i][$v.($i+1)]=$arr[$v.($i+1)];
}
}
print_r($newarr);
?>

Answer 4

Here's a solution that will locate the _x at the end to check its a digit
This solution does not worry about how many non numbered fields you have, or how many fields there are per numbered "row", they are also indexed based on the _x number.
$arr = [
'tqty' => 9,
'tPrice' => 18700,
'food_name_1' => 'Black Coffee',
'food_quanty_1' => 1,
'food_price_1' => 1000,
'food_name_2' => 'Sub Combo',
'food_quanty_2' => 2,
'food_price_2' => 3000
];
$arr2 = array();
foreach( $arr as $key => $value )
{
$explode = explode( '_', $key );
if( ctype_digit( $index = end( $explode ) ) === true)
{
if( isset( $arr2[ $index ] ) === false )
{
$arr2[ $index ] = array();
}
$arr2[ $index ][ substr( $key, 0, strlen( $key ) - 1 - strlen( $index ) ) ] = $value;
}
}
print_r( $arr2 );
Output:
Array
(
[1] => Array
(
[food_name] => Black Coffee
[food_quanty] => 1
[food_price] => 1000
)
[2] => Array
(
[food_name] => Sub Combo
[food_quanty] => 2
[food_price] => 3000
)
)

Answer 5

If you already know that you need always the same indexes from $arr, you can use the array_keys function in order to index the associative array.
Example:
$keys = array_keys($arr);
echo '<br><br>'.$arr[$keys[1]];
Here is a complete example:
$keys = array_keys($arr); #stores the associative keys by index
$arr2 = array();
/* For each array $arr do the following */
$limit = 5; #substitute this with: count($arraylist)
for( $n_array=0; $n_array<limit; $n_array++ ){
$cur_arr = array(); #substitute with your: $arraylist[ $n_array ]
for( $a = 2; $a<count($arr); $a++ ){
$cur_arr[ $keys[$a] ] = $arr[ $keys[$a] ];
}
$arr2[ $n_array ] = $cur_arr;
}
Hope it will be helpful