How to output even or odd numbers in an array using php

Function introduction:

array_filter() The function uses a callback function to filter the elements in the array.

This function passes each key value in the input array to the callback function. If the callback function returns true, the current key value in the input array is returned to the result array. Array key names remain unchanged.

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The code sample is as follows:

function odd($var){    // returns whether the input integer is odd    
    return($var & 1);
}

function even($var){    // returns whether the input integer is even    
    return(!($var & 1));
}

$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);

echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";print_r(array_filter($array2, "even"));

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