<?php
 
$vowels = array('a', 'o', 'u', 'i', 'j', 'e'); // Array of vowels
$uniqueVowels = array(); // Array to store unique vowels
$newString = ""; // String to store the result
 
echo "Enter a string (up to 70 characters): ";
$s1 = fgets(STDIN); // Get the input string
 
$s1 = trim($s1); // Remove leading and trailing spaces
 
if (strlen($s1) > 70) {
    echo "Error: String length cannot exceed 70 characters.\n";
    exit;
}
 
// Check each character in the input string
for ($i = 0; $i < strlen($s1); $i++) {
    $char = strtolower($s1[$i]); // Convert character to lowercase
 
    // Check if the character is a vowel
    if (in_array($char, $vowels)) {
        // Check if the vowel is already in the uniqueVowels array
        if (!in_array($char, $uniqueVowels)) {
            $uniqueVowels[] = $char; // Add the vowel to uniqueVowels
        }
    }
}
 
// Construct the new string with unique vowels
foreach ($uniqueVowels as $vowel) {
    $newString .= $vowel;
}
 
echo "String with unique vowels: " . $newString . "\n";
 
?>
 

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