How i can compare two dimensional array like below? - php

Question

I need elements of array 1 that are not present in array 2 based on the 'value' key only.
Array1
$array1 = array(
array('value' => 113214, 'revision_id' => 2047152),
array('value' => 236462, 'revision_id' => 2045678),
array('value' => 236541, 'revision_id' => 2047155)
);
Array2
$array2 = array(
array('value' => 113214, 'revision_id' => 2047152),
array('value' => 236461, 'revision_id' => 2047153),
array('value' => 236541, 'revision_id' => 2047155)
);
I need the output as below, the difference of arrays should be based on Value
$output = array(
array('value' => 236462, 'revision_id' => 2045678)
);

Answer 1

Just do a nested foreach loop and check the condition hope its helps you :
$arraycheck= array();
foreach($newData as $data1) {
$duplicatecheck = false;
foreach($oldData as $data2) {
if($data1['value'] === $data2['value'] && $data1['revision_id'] === $data2['revision_id']) $duplicatecheck = true;
}
if($duplicatecheck === false) $arraycheck[] = $data1;
}

Answer 2

First, use array_column to get the values of 'value' from array2 into a one-dimensional array:
$a2values = array_column($array2, 'value');
Then use those values to array_filter array1.
$result = array_filter($array1, function($item) use ($a2values) {
// only keep items with values not in array2
return !in_array($item['value'], $a2values);
});

Answer 3

You can use array_udiff which accepts last parameter as callback, and you can define your comparison there easily.
$array1 = [
['value' => '113214', 'revision_id' => '2047152'],
['value' => '236462', 'revision_id' => '2045678'],
['value' => '236541', 'revision_id' => '2047155'],
];
$array2 = [
['value' => '113214', 'revision_id' => '2047152'],
['value' => '236461', 'revision_id' => '2047153'],
['value' => '236541', 'revision_id' => '2047155'],
];
$result = array_udiff ($array1, $array2, function($x, $y) {
return $x['value'] - $y['value'];
});
print_r($result);

Answer 4

taken from: https://gist.github.com/wrey75/c631f6fe9c975354aec7
function my_array_diff($arr1, $arr2) {
$diff = array();
// Check the similarities
foreach( $arr1 as $k1=>$v1 ){
if( isset( $arr2[$k1]) ){
$v2 = $arr2[$k1];
if( is_array($v1) && is_array($v2) ){
// 2 arrays: just go further...
// .. and explain it's an update!
$changes = self::diff($v1, $v2);
if( count($changes) > 0 ){
// If we have no change, simply ignore
$diff[$k1] = array('upd' => $changes);
}
unset($arr2[$k1]); // don't forget
}
else if( $v2 === $v1 ){
// unset the value on the second array
// for the "surplus"
unset( $arr2[$k1] );
}
else {
// Don't mind if arrays or not.
$diff[$k1] = array( 'old' => $v1, 'new'=>$v2 );
unset( $arr2[$k1] );
}
}
else {
// remove information
$diff[$k1] = array( 'old' => $v1 );
}
}
// Now, check for new stuff in $arr2
foreach( $arr2 as $k=>$v ){
// OK, it is quite stupid my friend
$diff[$k] = array( 'new' => $v );
}
return $diff;
}
usage:
$diff = my_array_diff($arr1, $arr2);
var_dump($diff);