php 8 compability admin interface

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php 8 compability admin interface

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php 8 compability admin interface – WordPress Development Stack Exchange

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so on php 8 on admin interface it not shows me the saved values of this code

                // F O N T   S I Z E
                $val = $default['size'];
                if ( isset($typography_stored['size']) != "") {
                    $val = $typography_stored['size'];
                }
                $output .= '<div class="atp-typo-size"><div class="select_wrapper"><select class="select" name="'. $value['id'].'_size" id="'. $value['id'].'_size">';
                $output .= '<option value="">Font Size</option>';
                for ($i = 9; $i < 71; $i++){
                    if($val == $i){
                        $active="selected="selected"";
                    } else {
                        $active="";
                    }
                    $output .= '<option value="'. $i .'px" ' . $active . '>'. $i .'px</option>';
                }
                $output .= '</select></div></div>';

                // L I N E   H E I G H T
                $val = $default['lineheight'];
                if ( isset($typography_stored['lineheight']) != "") {
                    $val = $typography_stored['lineheight'];
                }
                $output .= '<div class="atp-typo-lineheight"><div class="select_wrapper"><select class="select" name="'. $value['id'].'_lineheight" id="'. $value['id'].'_lineheight">';
                $output .= '<option value="">Line Height</option>';
                for ($i = 9; $i < 71; $i++){
                    if($val == $i){
                        $active="selected="selected"";
                    } else {
                        $active="";
                    }
                    $output .= '<option value="'. $i .'px" ' . $active . '>'. $i .'px</option>';
                }
                $output .= '</select></div></div>';

so the problem is for ($i = 9; $i < 71; $i++){
because when i set the 7.4 php it shows fine to the interface of admin it only not shows on php 8 can you help me ? thanks