php array push key value

1$a = array("key1"=>"value1", "key2"=>"value2");
2
3// to append "key3" - "value3":
4$a["key3"] = "value3"

1<?php
2
3$a=array("red","green");
4
5array_push($a,"blue","yellow");
6
7print_r($a);
8?>

1<?php
2$a=array("a"=>"red","b"=>"green");
3array_push($a,"blue","yellow");
4print_r($a);
5?>

1// If you are creating new array then try this :
2$arr = array("key" => "value");
3
4// And if array is already created then try this :
5$arr["key"] = "value";

1// Error : "array_push() expects parameter 1 to be array, null given"
2// Don't array_push($array,$arrayValueToPush); 
3// Set the array value.
4$array["arrayKey"] = $arrayValue;
5//----------------------------------------
6$newArray = [];
7foreach ($arrayItems as $key => $arrayItem) {
8  $newArray[$key]["arrayItemKey1"] = $arrayItem["arrayItemKey1FromArrayItem"];
9  $newArray[$key]["arrayItemKey2"] = $arrayItem["arrayItemKey2FromArrayItem"];
10}

1<?php
2$image[0] = $image[0].','.$filename;
3?>