How to check if an array is a subset of another in PHP?

Description:

You need to find whether an array is subset of another array.

• Let us suppose that there are two arrays.
• First array is large which have 6 values.
• Second array is small which have 2 values
• Find if second array is subset of first which means that all values of second array should exists in first array.
• You can use Decision Making Statements.

PHP Program to find if an array is a subset of another:

<?php
// Define two array
$array1 = array('a','1','2','3','4');
$array2 = array('a','3');

// intersect/matched values should be equal to first array
if (array_intersect($array2, $array1) === $array2) {
  echo "It is a subset";
} else {
   echo "Not a subset";
}
?>

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