Answers for "php left join on two arrays"

associative array in php have same value join them

<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);

print_r($c);
?>

php inner join array

$array1 = [1, 5, 64, 2, 6];
$array2 = [2, 1, 8, 3];

//Method 1:
array_filter($array1, function($_){
    global $array2;
  return in_array($_, $array2);
}); // Output: [0 => 1, 3 => 2]

//Method 2:
array_intersect($array1, $array2); //Output: [0 => 1, 3 => 2]