Number 0...100 to Text

<?php
$inputNumber = intval(readline());
if ($inputNumber == 0) {
    echo "zero";
} elseif ($inputNumber == 1) {
    echo "one";
} elseif ($inputNumber == 2) {
    echo "two";
} elseif ($inputNumber == 3) {
    echo "three";
} elseif ($inputNumber == 4) {
    echo "four";
} elseif ($inputNumber == 5) {
    echo "five";
} elseif ($inputNumber == 6) {
    echo "six";
} elseif ($inputNumber == 7) {
    echo "seven";
} elseif ($inputNumber == 8) {
    echo "eight";
} elseif ($inputNumber == 9) {
    echo "nine";
} elseif ($inputNumber == 10) {
    echo "ten";
} elseif ($inputNumber == 11) {
    echo "eleven";
} elseif ($inputNumber == 12) {
    echo "twelve";
} elseif ($inputNumber == 13) {
    echo "thirteen";
} elseif ($inputNumber == 14) {
    echo "fourteen";
} elseif ($inputNumber == 15) {
    echo "fifteen";
} elseif ($inputNumber == 16) {
    echo "sixteen";
} elseif ($inputNumber == 17) {
    echo "seventeen";
} elseif ($inputNumber == 18) {
    echo "eighteen";
} elseif ($inputNumber == 19) {
    echo "nineteen";
} elseif ($inputNumber == 20) {
    echo "twenty";
} elseif ($inputNumber == 21) {
    echo "twenty one";
} elseif ($inputNumber == 22) {
    echo "twenty two";
} elseif ($inputNumber == 23) {
    echo "twenty three";
} elseif ($inputNumber == 24) {
    echo "twenty four";
} elseif ($inputNumber == 25) {
    echo "twenty five";
} elseif ($inputNumber == 26) {
    echo "twenty six";
} elseif ($inputNumber == 27) {
    echo "twenty seven";
} elseif ($inputNumber == 28) {
    echo "twenty eight";
} elseif ($inputNumber == 29) {
    echo "twenty nine";
} elseif ($inputNumber == 30) {
    echo "thirty";
} elseif ($inputNumber == 31) {
    echo "thirty one";
} elseif ($inputNumber == 32) {
    echo "thirty two";
} elseif ($inputNumber == 33) {
    echo "thirty three";
} elseif ($inputNumber == 34) {
    echo "thirty four";
} elseif ($inputNumber == 35) {
    echo "thirty five";
} elseif ($inputNumber == 36) {
    echo "thirty six";
} elseif ($inputNumber == 37) {
    echo "thirty seven";
} elseif ($inputNumber == 38) {
    echo "thirty eight";
} elseif ($inputNumber == 39) {
    echo "thirty nine";
} elseif ($inputNumber == 40) {
    echo "forty";
} elseif ($inputNumber == 41) {
    echo "forty one";
} elseif ($inputNumber == 42) {
    echo "forty two";
} elseif ($inputNumber == 43) {
    echo "forty three";
} elseif ($inputNumber == 44) {
    echo "forty four";
} elseif ($inputNumber == 45) {
    echo "forty five";
} elseif ($inputNumber == 46) {
    echo "forty six";
} elseif ($inputNumber == 47) {
    echo "forty seven";
} elseif ($inputNumber == 48) {
    echo "forty eight";
} elseif ($inputNumber == 49) {
    echo "forty nine";
} elseif ($inputNumber == 50) {
    echo "fifty";
} elseif ($inputNumber == 51) {
    echo "fifty one";
} elseif ($inputNumber == 52) {
    echo "fifty two";
} elseif ($inputNumber == 53) {
    echo "fifty three";
} elseif ($inputNumber == 54) {
    echo "fifty four";
} elseif ($inputNumber == 55) {
    echo "fifty five";
} elseif ($inputNumber == 56) {
    echo "fifty six";
} elseif ($inputNumber == 57) {
    echo "fifty seven";
} elseif ($inputNumber == 58) {
    echo "fifty eight";
} elseif ($inputNumber == 59) {
    echo "fifty nine";
} elseif ($inputNumber == 60) {
    echo "sixty";
} elseif ($inputNumber == 61) {
    echo "sixty one";
} elseif ($inputNumber == 62) {
    echo "sixty two";
} elseif ($inputNumber == 63) {
    echo "sixty three";
} elseif ($inputNumber == 64) {
    echo "sixty four";
} elseif ($inputNumber == 65) {
    echo "sixty five";
} elseif ($inputNumber == 66) {
    echo "sixty six";
} elseif ($inputNumber == 67) {
    echo "sixty seven";
} elseif ($inputNumber == 68) {
    echo "sixty eight";
} elseif ($inputNumber == 69) {
    echo "sixty nine";
} elseif ($inputNumber == 70) {
    echo "seventy";
} elseif ($inputNumber == 71) {
    echo "seventy one";
} elseif ($inputNumber == 72) {
    echo "seventy two";
} elseif ($inputNumber == 73) {
    echo "seventy three";
} elseif ($inputNumber == 74) {
    echo "seventy four";
} elseif ($inputNumber == 75) {
    echo "seventy five";
} elseif ($inputNumber == 76) {
    echo "seventy six";
} elseif ($inputNumber == 77) {
    echo "seventy seven";
} elseif ($inputNumber == 78) {
    echo "seventy eight";
} elseif ($inputNumber == 79) {
    echo "seventy nine";
} elseif ($inputNumber == 80) {
    echo "eighty";
} elseif ($inputNumber == 81) {
    echo "eighty one";
} elseif ($inputNumber == 82) {
    echo "eighty two";
} elseif ($inputNumber == 83) {
    echo "eighty three";
} elseif ($inputNumber == 84) {
    echo "eighty four";
} elseif ($inputNumber == 85) {
    echo "eighty five";
} elseif ($inputNumber == 86) {
    echo "eighty six";
} elseif ($inputNumber == 87) {
    echo "eighty seven";
} elseif ($inputNumber == 88) {
    echo "eighty eight";
} elseif ($inputNumber == 89) {
    echo "eighty nine";
} elseif ($inputNumber == 90) {
    echo "ninety";
} elseif ($inputNumber == 91) {
    echo "ninety one";
} elseif ($inputNumber == 92) {
    echo "ninety two";
} elseif ($inputNumber == 93) {
    echo "ninety three";
} elseif ($inputNumber == 94) {
    echo "ninety four";
} elseif ($inputNumber == 95) {
    echo "ninety five";
} elseif ($inputNumber == 96) {
    echo "ninety six";
} elseif ($inputNumber == 97) {
    echo "ninety seven";
} elseif ($inputNumber == 98) {
    echo "ninety eight";
} elseif ($inputNumber == 99) {
    echo "ninety nine";
} elseif ($inputNumber == 100) {
    echo "one hundred";
} else {
    echo "invalid number";
}