php - String inside function -

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i have written program in have create function. function expect 3 parameters $string, $start, $end. inside function, have write logic inside function automatically print string depending upon value of $start , $end.

i tried whole function working correctly array length 55 when specify $end=55 returns error ending value exceeded string length:

function string_function($string,$start,$end){      $length= strlen($string);      if($start<0 || $end<0){         echo "start or end of string cannot in negative";         }else if($start>$length || $end>$length){         echo "entered values exceed more string's length";     }else if($start>$end){         echo "start point greater end point, invalid";     }else if($end<$length){         $length <= ($end+1);         for($i=$start; $i<=$end; $i++){             echo "[$i] => ".$string[$i]."<br>";         }         }else{              echo "ending value exceeded string length";     } } $start = 22; $end =54; $string = "i programmer , passionate programming"; string_function($string, $start, $end);

help welcomed.

change else if part to:

else if($end<=$length){     $length <= ($end+1);     for($i=$start; $i<$end; $i++){         echo "[$i] => ".$string[$i]."<br>";     } }

since array starts 0th index, end specify length of array. maximum array index 1 less total length. iteration should therefore 1 less end variable

[as discussed in comments]


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