Remove array from multi-dimensional indexed array based on duplicate value [duplicate] - php

Question

This question already has answers here:
PHP unique array by value?
(6 answers)
Closed 6 years ago.
I have a PHP array that looks like this,
[["a","b"],["e","j"],["a","s"]]
I need it to look like this,
[["a","b"],["e","j"]]
or this,
[["e","j"],["a","s"]]
I cannot have two inner arrays that contain the same "0" index. It does not matter which inner array is deleted as long as only one remains. How can I go through this array and remove inner arrays that contain the same "0" index?
Thanks!

Answer 1

You could simply loop through the array with two loops. Let's say this is your data:
$data = array(
array('a', 'b'),
array('e', 'j'),
array('a', 's'),
array('a', 't'),
array('c', 't'),
array('a', 'h'),
array('c', 'e'),
array('f', 'g')
);
Then you go ahead and loop through everything, and unset it if it's the same value.
$count = count($data);
foreach($data as $index => $array){
for($i=$index + 1; $i<$count; $i++)
if(isset($array[0]) && isset($data[$i][0]) && $array[0] == $data[$i][0])
unset($data[$i]);
}
The var_dump of $data after the loops would be:
array(4) {
[0]=>
array(2) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
}
[1]=>
array(2) {
[0]=>
string(1) "e"
[1]=>
string(1) "j"
}
[4]=>
array(2) {
[0]=>
string(1) "c"
[1]=>
string(1) "t"
}
[7]=>
array(2) {
[0]=>
string(1) "f"
[1]=>
string(1) "g"
}
}

Answer 2

<?php
$array = [["a","b"],["e","j"],["a","s"]];
$values = array();
foreach ($array as $key => $arrayChild) {
foreach ($arrayChild as $val) {
if (in_array($val, $values)) {
unset($array[$key]);
}
$values[] = $val;
}
}
print_r($array);
?>
Result:
Array (
[0] => Array ( [0] => a [1] => b )
[1] => Array ( [0] => e [1] => j )
)