PHP multiple duplicate values in multidimensional array - php

Question

I am trying to update the below array to set "duplicate" => true when both "name" and "date" are the same. In the below example 'array[1][duplicate]=>true' as both
array[0] & array[1] have the same "name"=john & "date"=2015-7-24
Array
(
[0] => Array
(
[id] => 1
[name] => john
[date] => 2015-07-24
[duplicate] => false
)
[1] => Array
(
[id] => 1
[name] => john
[date] => 2015-07-24
[duplicate] => false
)
[2] => Array
(
[id] => 1
[name] => jane
[date] => 2015-07-24
[duplicate] => false
)
[3] => Array
(
[id] => 1
[name] => notJaneORJohn
[date] => 2015-07-24
[duplicate] => false
)
[4] => Array
(
[id] => 1
[name] => jane
[date] => 2099-07-24
[duplicate] => false
)
)

Answer 1

Try this,
$array = Array
(
0 => Array
(
'id' => '1',
'name' => 'john',
'date' => '2015-07-24',
'duplicate' => 'false',
),
1 => Array
(
'id' => 1,
'name' => 'john',
'date' => '2015-07-24',
'duplicate' => 'false'
),
2 => Array
(
'id' => 1,
'name' => 'jane',
'date' => '2015-07-24',
'duplicate' => 'false'
),
3 => Array
(
'id' => 1,
'name' => 'notJaneORJohn',
'date' => '2015-07-24',
'duplicate' => 'false'
),
4 => Array
(
'id' => 1,
'name' => 'jane',
'date' => '2099-07-24',
'duplicate' => 'false'
)
);
foreach ($array as $key => $value) {
for ($i = $key + 1 ; $i < sizeof($array); $i++) {
if ($value['name'] === $array[$i]['name'] && $value['date'] === $array[$i]['date']) {
$array[$key]['duplicate'] = 'TRUE';
$array[$i]['duplicate'] = 'TRUE';
}
}
}

Answer 2

This would work:
$Arr = Array(
['id'=>1, 'name'=>'john', 'date'=>'2015-07-24', 'duplicate'=>0],
['id'=>1, 'name'=>'john', 'date'=>'2015-07-24', 'duplicate'=>0],
['id'=>1, 'name'=>'Jane', 'date'=>'2015-07-24', 'duplicate'=>0]
);
foreach($Arr as $i1 => $v1){
$Str1 = $v1['name'].$v1['date'];
foreach($Arr as $i2 => $v2){
if( $i1 !== $i2 && $Str1 === $v2['name'].$v2['date'] ){
$Arr[$i1]['duplicate'] = 1;
}
}
}
echo '<pre>',print_r($Arr),'</pre>'; die();
... outputs:
Array(
[0] => Array
(
[id] => 1
[name] => john
[date] => 2015-07-24
[duplicate] => 1
)
[1] => Array
(
[id] => 1
[name] => john
[date] => 2015-07-24
[duplicate] => 1
)
[2] => Array
(
[id] => 1
[name] => Jane
[date] => 2015-07-24
[duplicate] => 0
)
)

Answer 3

Have a look at this shortcut method ;)
<?php $testarr = array(
array("id" => 1,"name" => "john","date" => "2015-07-24","duplicate" => "false"),
array("id" => 1,"name" => "john","date" => "2015-07-24","duplicate" => "false"),
array("id" => 1,"name" => "jane","date" => "2015-07-24","duplicate" => "false"),
array("id" => 1,"name" => "notJaneORJohn","date" => "2015-07-24","duplicate" => "false"),
array("id" => 1,"name" => "jane","date" => "2099-07-24","duplicate" => "false")
);
$tempArray = array();
function checkDuplicate(&$arr) {
global $tempArray;
if (count($tempArray) > 0 && in_array($arr['name'], $tempArray) && in_array($arr['date'], $tempArray)) {
$arr['duplicate'] = "true";
} else {
$tempArray[] = $arr['name'];
$tempArray[] = $arr['date'];
}
}
array_walk($testarr, 'checkDuplicate');
print_r($testarr);