Question

How to to check if all the characters of a string are with same frequencies in PHP

Answer 1

function same_frequencies($s) { 
    $letters = array();
    $letters = array_fill(0, 256, 0);
    $len = strlen($s);
             
    for ($i = 0; $i < $len; $i++) {
         if (ctype_alpha($s[$i])) {
             $letters[ord($s[$i])]++;
         }
    }
 
    $frequencies = 0; 
    for ($i = 0; $i < 256; $i++) { 
        if ($letters[$i] != 0) {
            $frequencies = $letters[$i];
            break;
        }
    }
       
    for ($i = 0; $i < 256; $i++) { 
        if ($letters[$i] != 0 && ($letters[$i] != $frequencies)) {
            return false;
        }
    } 
    return true;
} 

$s = "aaabbbcccwww"; 

if (same_frequencies($s)) {
    echo "Yes"; 
}
else {
    echo "No"; 
}
         


    
/*
run:

Yes
         
*/

 

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