How to remove an array of duplicate keys in a multidimensional array
I have this array, I want to delete the array if it is the same from the others
$appointments = array(
array('1','Monday', '5:30 PM'),
array('2','Friday', '6:00 PM'),
array('3','Monday', '5:30 PM'),
array('4','Tuesday', '4:15 PM'),
array('5','Wednesday', '8:30 PM'),
array('6','Thursday', '1:45 PM')
);
I want this result Monday and the time is displayed twice, so I only have to display once when I use below code to do this, so please provide a better solution for this
$one_dimension = array_map('serialize', $appointments);
$unique_one_dimension = array_unique($one_dimension);
$unique_multi_dimension = array_map('unserialize', $unique_one_dimension);
echo "<pre>";print_r($unique_multi_dimension);
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4 answers
<?php
$appointments = array(
array('1','Monday', '5:30 PM'),
array('2','Friday', '6:00 PM'),
array('3','Monday', '5:30 PM'),
array('4','Tuesday', '4:15 PM'),
array('5','Wednesday', '8:30 PM'),
array('6','Thursday', '1:45 PM')
);
//Here we are finding column of week days.
$implodedColumns= array_map(function($data){
unset($data[0]);
return implode(",", array_map('trim', $data));
}, $appointments);
$result=array_unique($implodedColumns);
array_walk($result, function(&$value,$key){
$value= array_merge(array($key), explode(",", $value));
});
print_r($result);
Output:
Array
(
[0] => Array
(
[0] => 0
[1] => Monday
[2] => 5:30 PM
)
[1] => Array
(
[0] => 1
[1] => Friday
[2] => 6:00 PM
)
[3] => Array
(
[0] => 3
[1] => Tuesday
[2] => 4:15 PM
)
[4] => Array
(
[0] => 4
[1] => Wednesday
[2] => 8:30 PM
)
[5] => Array
(
[0] => 5
[1] => Thursday
[2] => 1:45 PM
)
)
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Standard O (n ^ 2) generic cloning solution:
function array_unique_callback($array, $equalityComparer) {
$uniqueFiltered = [];
$keys = array_keys($array);
for ($i = 0;$i < count($array);$i++) {
$add = true;
for ($j = 0;$j < $i;$j++) {
if ($equalityComparer($array[$keys[$i]], $array[$keys[$j]])) {
$add = false;
break;
}
}
if ($add) {
$uniqueFiltered[] = $array[$keys[$i]];
}
}
return $uniqueFiltered;
}
array_unique_callback($appointments, function ($x,$y) {
return $x[1] == $y[1] && $x[2] == $y[2];
});
Example: http://sandbox.onlinephpfunctions.com/code/8013c36b78d24f08651b05375d686c9e07c75a49
If you want a more optimized version:
function array_unique_callback($array, $comparer) {
//Comparer is not an equality comparer, it returns negative if $x less than $y, 0 if they are equal and 1 if $x greater than $y
$keys = array_keys($array);
uasort($array, $comparer);
$uniqueFiltered = [];
for ($i = 0;$i < count($array);$i++) {
$uniqueFiltered[$keys[$i]] = $array[$keys[$i]];
while ($i < count($array) && $comparer($array[$keys[$i]],$array[$keys[$i+1]]) === 0) { $i++; }
}
return $uniqueFiltered;
}
However, for the second version, you need to decide how to compare and order each item (which is not always possible).
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@Er Nilay Parekh you can do it like below:
<?php
$appointments = array(
array('1','Monday', '5:30 PM'),
array('2','Friday', '6:00 PM'),
array('3','Monday', '5:30 PM'),
array('4','Tuesday', '4:15 PM'),
array('5','Wednesday', '8:30 PM'),
array('6','Thursday', '1:45 PM')
);
$isTimeExist = array();
foreach ($appointments as $key => $value) {
if(in_array($value[2], $isTimeExist)){
unset($appointments[$key]);
}
$isTimeExist[] = $value[2];
}
echo "<pre>";
print_r(array_values($appointments));
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