Resolved: How to split an array’s objects by year of JSON using PHP?

[
{
    "id": "47",
    "date": "07/16/2022",
    "text": "ph"
}
{
    "id": "46",
    "date": "06/16/2022",
    "text": "ph"
},
{
    "id": "45",
    "date": "06/16/2021",
    "text": "ph"
}]

[
"2021": [{
   "id": "45",
   "date": "06/16/2021",
   "text": "ph"
}],
"2022": [{
    "id": "46",
    "date": "06/16/2022",
    "text": "ph"
},
{
    "id": "47",
    "date": "07/16/2022",
    "text": "ip"
}]
]

const input = [
  {
      "id": "47",
      "date": "07/16/2022",
      "text": "ph"
  },
  {
      "id": "46",
      "date": "06/16/2022",
      "text": "ph"
  },
  {
      "id": "45",
      "date": "06/16/2021",
      "text": "ph"
  }
];

const output = {};
//for each object in the input array
for(o of input){
  //parse the year part of the date property
  const year = o.date.substring(6);
  //if the parsed year doesn't exist yet in the output object
  if (!output.hasOwnProperty(year))
    //then add an empty array to the year key in the output object
    output[year] = [];
  //add the current input object to the array bound to the year key in the output object
  output[year].push(o);  
}

console.log( output );

<?php

$input = [
  [
      "id" => "47",
      "date" => "07/16/2022",
      "text" => "ph"
  ],
  [
      "id" => "46",
      "date" => "06/16/2022",
      "text" => "ph"
  ],
  [
      "id" => "45",
      "date" => "06/16/2021",
      "text" => "ph"
  ]
];

$output = [];
//for each object in the input array
foreach($input as $o){
  //parse the year part of the date property
  $year = substr($o['date'], 6);
  //if the parsed year doesn't exist yet in the output object
  if (!array_key_exists($year, $output))
    //then add an empty array to the year key in the output object
    $output[$year] = [];
  //add the current input object to the array bound to the year key in the output object
  $output[$year][] = $o;  
}

var_dump( $output );