What's wrong with this simple code?

Question

I want to compare the 2 arrays below and find the differences. The values for keys "lead owner" and "company" are different, but when I compare these arrays, it says only "company" values are different. But when I create 2 new arrays with only one key/value pair for "lead owner" it works properly. Am I making some mistake?

<?php

$arr1 = Array
    (
        "leadid" => "418176000000069007",
        "smownerid" => "418176000000047003",
        "lead owner" => "Amit Patil",
        "company" => "SAM",
        "first name" => "Test",
        "last name" =>"Lead1",
        "designation" => "call",
        "email" => "",
        "phone" => "958",
        "fax" => "",
        "mobile" => "",
        "website" => "www.infosys.con",
        "lead source" => "Cold Call",
        "lead status" => "Contact in Future",
        "industry" => "None",
        "no of employees" => "45000",
        "annual revenue" => "0",
        "rating" => "Active",
        "smcreatorid" => "418176000000047003",
        "created by" => "Amit Patil",
        "modifiedby" => "418176000000047003",
        "modified by" => "Amit Patil",
        "created time" => "2012-04-05 19:58:00",
        "modified time" => "2012-05-02 08:51:08",
        "street" => "",
        "city" => "",
        "state" => "",
        "zip code" => "",
        "country" => "",
        "description" => "",
        "skype id" => "",
        "email opt out" => "false",
        "salutation" => "Mr.",
        "secondary email" => ""
        );

$arr2 = Array
    (
        "leadid" => "418176000000069007",
        "smownerid" => "418176000000047003",
        "lead owner" => "Amit aaa",
        "company" => "SAM A",
        "first name" => "Test",
        "last name" => "Lead1",
        "designation" => "call",
        "email" => "",
        "phone" => "958",
        "fax" => "",
        "mobile" => "",
        "website" => "www.infosys.con",
        "lead_source" => "Cold Call",
        "lead_status" => "Contact in Future",
        "industry" => "None",
        "no_of_employees" => "45000",
        "annual_revenue" => "0",
        "rating" => "Active",
        "smcreatorid" => "418176000000047003",
        "created_by" => "Amit Patil",
        "modifiedby" => "418176000000047003",
        "modified_by" => "Amit Patil",
        "created_time" => "2012-04-05 19:58:00",
        "modified_time" => "2012-05-02 08:51:08",
        "street" => "",
        "city" => "",
        "state" => "",
        "zip_code" => "0",
        "country" => "",
        "description" => "",
        "skype_id" => "",
        "email_opt_out" => "false",
        "salutation" => "Mr.",
        "secondary_email" => ""
        );

$arr3 = array("lead owner" => "Amit Patil");
$arr4 = array("lead owner" => "Amit aaa");

print_r(array_diff($arr1,$arr2));
echo "<br>";
print_r(array_diff($arr3,$arr4));
?>

Output is as below

Array ( [company] => SAM )
Array ( [lead owner] => Amit Patil ) 

Answer 1

You are understanding it wrongly.

The documentation page of array_diff says

Returns an array containing all the entries from array1 that are not present in any of the other arrays.

But the Amit Patil is present in the second array hence it is returning only one value which is SAM and It is only one value which is not present in second array.

Answer 2

如果要在关联数组之间进行区分，以便键值对（而不只是值）很重要，请使用array_diff_assoc ，而不要使用array_diff 。

Answer 3

array_diff() returns complementary values. So you can do it like this:

   array_diff(array_merge($arr1, $arr2), array_intersect($arr1, $arr2));

This way it will work.

Answer 4

It happens because the "array_diff" function returns the values that occurs for any key in the first array and do not occurs for none of the keys in the second array.

The lead_owner "Amit Patil" is not equal to the second array lead_owner, but is equal to the created_by and modified_by keys of the second one.

You should use "array_diff_assoc" for this purpose.

Answer 5

try this and see, this should work

print_r(array_diff_assoc($arr1,$arr2));
echo "<br>";
print_r(array_diff_assoc($arr3,$arr4));