MYSQL PHP Array grouping - php

Question

Having trouble wrapping my head around this conceptually. Still new to this. Basically I have this return from my database :
array (size=456)
0 =>
object(stdClass)[358]
public 'id' => string '2432' (length=4)
public 'symbol' => string '.AMLP' (length=14)
public 'last' => string '0.01' (length=4)
public 'volume' => string '3690' (length=4)
public 'the_date' => string '2019-09-13' (length=10)
public 'the_screener' => string '1' (length=1)
public 'notes' => string 'notes here' (length=149)
1 =>
object(stdClass)[726]
public 'id' => string '2417' (length=4)
public 'symbol' => string '.ARCC' (length=14)
public 'last' => string '2.25' (length=4)
public 'volume' => string '1633' (length=4)
public 'the_date' => string '2019-09-13' (length=10)
public 'the_screener' => string '1' (length=1)
public 'notes' => string 'notes' (length=60)
2 =>
object(stdClass)[726]
public 'id' => string '2447' (length=4)
public 'symbol' => string '.ARCC' (length=14)
public 'last' => string '2.25' (length=4)
public 'volume' => string '1633' (length=4)
public 'the_date' => string '2019-09-12' (length=10)
public 'the_screener' => string '1' (length=1)
public 'notes' => string 'notes here 3' (length=60)
3 =>
What I'm trying to do with PHP is create an object/array that I can work with that displays these items like
AMLP 1 found on dates 2019-09-13
ARCC 2 found on dates 2019-09-13, 2019-09-12
In the end I would display these in a table, but conceptually this is what I'm trying to do.
I've tried creating an array in my foreach I use to display this information in a table, but I was thinking about it and it's probably better to just use the same query data and break it down separately.
So I'd like to create an array like :
Array
(
[1] => Array
(
[id] => 1
[symbol] => ARCC
[dates] => Array
(
[3] => Array
(
2019-09-13
2019-09-12
)
)
)
)

Answer 1

Consider your array is $arrDates. If you want to access properties like object properties
$arrFinal = [];
foreach ($arrDates as $intKey => $obj){
$strSymbol = getSubSymbol($obj->symbol);
if(!isset($arrFinal[$strSymbol])) {
$arrFinal[$strSymbol] = [ 'id' => $obj->id, 'symbol' => $obj->symbol];
}
$arrFinal[$strSymbol]['dates'][] = $obj->the_date;
}
// Now loop throuh arrFinal and do print the statements you want.
foreach($arrFinal as $strSubSymbol => $arrData){
echo $strSubSymbol . ' '. count($arrData['dates']) . ' found on dates ' . implode(',', $arrData['dates']). PHP_EOL;
}
Function to get the desired subpart of symbol
function getSubSymbol($symbol_original){
$symbol = preg_split('/(?=\d)/', $symbol_original, 2); //get everything up until first number or the date in the string in this case.
$symbol_here = substr($symbol[0], 1);
return $symbol_here;
}