Question

How to check if a string contain only two same repeating characters in PHP

Answer 1

function contain_only_two_same_repeating_chars($s) {  
    $len = strlen($s);
    if ($len % 2 != 0) {
        return false;
    }
    for ($i = 0; $i < $len - 2; $i++) {  
         if ($s[$i] != $s[$i + 2]) {  
             return false;  
         }  
    }  
    return true;  
}  
 
 
$s = "ababababab"; 
 
if (contain_only_two_same_repeating_chars($s)) {
    echo "Yes"; 
}
else {
    echo "No"; 
}
          
 
 
     
/*
run:
 
Yes
          
*/

 

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