Check if array value exist in another array, if not, replace with another value

Question

I have here two arrays. I've echoed it using json_encode():

$myarray1= [{"date":"2017-04-18","count":"3"},{"date":"2017-04-19","count":"2"},{"date":"2017-04-20","count":"1"},{"date":"2017-04-24","count":"1"},{"date":"2017-04-25","count":"1"},{"date":"2017-05-02","count":"2"},{"date":"2017-05-03","count":"1"},{"date":"2017-05-04","count":"1"},{"date":"2017-05-09","count":"1"},{"date":"2017-05-10","count":"2"},{"date":"2017-05-11","count":"6"},{"date":"2017-05-12","count":"5"},{"date":"2017-05-17","count":"3"},{"date":"2017-05-19","count":"2"},{"date":"2017-05-30","count":"3"}]

AND

$myarray2= [{"date":"2017-04-18"},{"date":"2017-04-19"},{"date":"2017-04-20"},{"date":"2017-04-21"},{"date":"2017-04-22"},{"date":"2017-04-23"},{"date":"2017-04-24"},{"date":"2017-04-25"},{"date":"2017-04-26"},{"date":"2017-04-27"},{"date":"2017-04-28"},{"date":"2017-04-29"},{"date":"2017-04-30"},{"date":"2017-05-01"},{"date":"2017-05-02"},{"date":"2017-05-03"},{"date":"2017-05-04"},{"date":"2017-05-05"},{"date":"2017-05-06"},{"date":"2017-05-07"},{"date":"2017-05-08"},{"date":"2017-05-09"},{"date":"2017-05-10"},{"date":"2017-05-11"},{"date":"2017-05-12"},{"date":"2017-05-13"},{"date":"2017-05-14"},{"date":"2017-05-15"},{"date":"2017-05-16"},{"date":"2017-05-17"},{"date":"2017-05-18"},{"date":"2017-05-19"},{"date":"2017-05-20"},{"date":"2017-05-21"},{"date":"2017-05-22"},{"date":"2017-05-23"},{"date":"2017-05-24"},{"date":"2017-05-25"},{"date":"2017-05-26"},{"date":"2017-05-27"},{"date":"2017-05-28"},{"date":"2017-05-29"},{"date":"2017-05-30"},{"date":"2017-05-31"},{"date":"2017-06-01"}]

How would I check if a $myarray2 value is in the $myarray1 array?

Thanks everyone.

What is your expected output? Your title suggests you want to replace something. Please show what you want in your result array. — mickmackusa
– mickmackusa ♦, Commented Jun 1, 2017 at 4:28
My expected output would be values that are not inside $myarray1. — Caren Divinagracia
– Caren Divinagracia, Commented Jun 1, 2017 at 4:38

Rahul · Accepted Answer · 2017-06-01 03:49:43Z

1

You could use array_intersect

example :

<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>

for more documentation read here http://php.net/manual/en/function.array-intersect.php

answered Jun 1, 2017 at 3:49

Rahul

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Sahil Gulati · Accepted Answer · 2017-06-01 03:52:33Z

Here we are using json_decode array_column and array_intersect.

Try this code snippet here

<?php
ini_set('display_errors', 1);

$string1='[{"date":"2017-04-18","count":"3"},{"date":"2017-04-19","count":"2"},{"date":"2017-04-20","count":"1"},{"date":"2017-04-24","count":"1"},{"date":"2017-04-25","count":"1"},{"date":"2017-05-02","count":"2"},{"date":"2017-05-03","count":"1"},{"date":"2017-05-04","count":"1"},{"date":"2017-05-09","count":"1"},{"date":"2017-05-10","count":"2"},{"date":"2017-05-11","count":"6"},{"date":"2017-05-12","count":"5"},{"date":"2017-05-17","count":"3"},{"date":"2017-05-19","count":"2"},{"date":"2017-05-30","count":"3"}]';
$string2='[{"date":"2017-04-18"},{"date":"2017-04-19"},{"date":"2017-04-20"},{"date":"2017-04-21"},{"date":"2017-04-22"},{"date":"2017-04-23"},{"date":"2017-04-24"},{"date":"2017-04-25"},{"date":"2017-04-26"},{"date":"2017-04-27"},{"date":"2017-04-28"},{"date":"2017-04-29"},{"date":"2017-04-30"},{"date":"2017-05-01"},{"date":"2017-05-02"},{"date":"2017-05-03"},{"date":"2017-05-04"},{"date":"2017-05-05"},{"date":"2017-05-06"},{"date":"2017-05-07"},{"date":"2017-05-08"},{"date":"2017-05-09"},{"date":"2017-05-10"},{"date":"2017-05-11"},{"date":"2017-05-12"},{"date":"2017-05-13"},{"date":"2017-05-14"},{"date":"2017-05-15"},{"date":"2017-05-16"},{"date":"2017-05-17"},{"date":"2017-05-18"},{"date":"2017-05-19"},{"date":"2017-05-20"},{"date":"2017-05-21"},{"date":"2017-05-22"},{"date":"2017-05-23"},{"date":"2017-05-24"},{"date":"2017-05-25"},{"date":"2017-05-26"},{"date":"2017-05-27"},{"date":"2017-05-28"},{"date":"2017-05-29"},{"date":"2017-05-30"},{"date":"2017-05-31"},{"date":"2017-06-01"}]';

$array1=json_decode($string1,true);
$array2=json_decode($string2,true);

print_r(array_intersect(array_column($array1, "date"), array_column($array2,"date")));

mickmackusa · Accepted Answer · 2017-06-01 04:50:19Z

You don't want intersect(), you want diff():

Demo

var_export(array_diff(array_column($array2,'date'),array_column($array1,'date')));

Output (the non-matching dates):

array (
  3 => '2017-04-21',
  4 => '2017-04-22',
  5 => '2017-04-23',
  8 => '2017-04-26',
  9 => '2017-04-27',
  10 => '2017-04-28',
  11 => '2017-04-29',
  12 => '2017-04-30',
  13 => '2017-05-01',
  17 => '2017-05-05',
  18 => '2017-05-06',
  19 => '2017-05-07',
  20 => '2017-05-08',
  25 => '2017-05-13',
  26 => '2017-05-14',
  27 => '2017-05-15',
  28 => '2017-05-16',
  30 => '2017-05-18',
  32 => '2017-05-20',
  33 => '2017-05-21',
  34 => '2017-05-22',
  35 => '2017-05-23',
  36 => '2017-05-24',
  37 => '2017-05-25',
  38 => '2017-05-26',
  39 => '2017-05-27',
  40 => '2017-05-28',
  41 => '2017-05-29',
  43 => '2017-05-31',
  44 => '2017-06-01',
)

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