add key to array php code example

Example 1: php append to array

$myArr = [1, 2, 3, 4];

array_push($myArr, 5, 8);
print_r($myArr); // [1, 2, 3, 4, 5, 8]

$myArr[] = -1;
print_r($myArr); // [1, 2, 3, 4, 5, 8, -1]

Example 2: array_push

$array[$key] = $value;
// or
$array[] = $value;
// or
array_push($array, [ mixed $... ]);

Example 3: php array push with key

<?php
$a=array("a"=>"red","b"=>"green");
array_push($a,"blue","yellow");
print_r($a);
?>

Example 4: insert key-value pair into array php

// If you are creating new array then try this :
$arr = array("key" => "value");

// And if array is already created then try this :
$arr["key"] = "value";

Example 5: php array push with key

// Error : "array_push() expects parameter 1 to be array, null given"
// Don't array_push($array,$arrayValueToPush); 
// Set the array value.
$array["arrayKey"] = $arrayValue;
//----------------------------------------
$newArray = [];
foreach ($arrayItems as $key => $arrayItem) {
  $newArray[$key]["arrayItemKey1"] = $arrayItem["arrayItemKey1FromArrayItem"];
  $newArray[$key]["arrayItemKey2"] = $arrayItem["arrayItemKey2FromArrayItem"];
}

Example 6: add object in array php

$myArray = array("name" => "my name");
echo json_encode($myArray);