Example: PHP program to check whether input character is vowel or consonant

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PHP

<?php
// PHP program to check whether input character is vowel or consonant using if-else

$x = "O";
$l = 0;
$u = 0;

// $l denotes for lowercase vowels
// $u denotes for uppercase vowels

// ctype_alpha() function checks
// whether character is alphabetic or non-alphabetic
if ($x && ctype_alpha($x)) {

    // this will return 1 if input character matched with these small characters
    $l = $x == 'a' || $x == 'e' || $x == 'i' || $x == 'o' || $x == 'u';
    
    // this will return 1 if input character matched with these capital characters
    $u = $x == 'A' || $x == 'E' || $x == 'I' || $x == 'O' || $x == 'U';
    
    if ($l || $u)
    	echo "'" . $x . "' is a vowel character.\n";
    else
    	echo "'" . $x . "' is a consonant character.\n";
} else {
    echo "Sorry, You entered Non-Alphabetic character!\n";
}

?>