生成时间下拉菜单【有待完善】

<?php
    header(‘content-type:text/html;charset="utf-8"‘);
    date_default_timezone_set(‘PRC‘); //设置中国时区 
    
    $amstart = ‘17:00‘;        //AM        
    $amend = ‘18:00‘;        //PM
    $pmstart = ‘18:30‘;
    $pmend = ‘19:30‘;
    
    function getoption($amstart,$amend,$pmstart,$pmend){
        $amstart = strtotime($amstart);
        $amend = strtotime($amend);
        $pmstart = strtotime($pmstart);
        $pmend = strtotime($pmend);
        //$dateTime = strtotime(date(‘H:i‘));
        $am = array();
        
        //计算上午时间范围差
        $AmTime = floor(($amend - $amstart)/3600);
        //计算下午时间范围差
        $PmTime =  floor(($pmend - $pmstart)/3600);
        $apTime = ($amend - $pmstart)/3600;
        //时间间隔
        $time = 30 * 60;
        //echo "开始 - 结束: ".change($amstart)." --- ".change($amend);
        //echo "<br>开始 - 结束: ".change($pmstart)." --- ".change($pmend);
        //echo "<br>上午时间差: ".$AmTime,"<br>下午时间差: ".$PmTime;
   　　　
　　　　　for($i=1;$i<=$AmTime*2-1;$i++){    
            if($i == 1){
                $am[$i][‘b‘] = $amstart + $time;        //开始时间
                $am[$i][‘e‘] = $am[$i][‘b‘] + $time;    //结束时间
            }else{
                $am[$i][‘b‘] = $am[$i-1][‘e‘];
                $am[$i][‘e‘] = $am[$i][‘b‘] + $time;
            } 
        }
        //var_dump(count($am)+1);

        $am[count($am)+1][‘d‘] = 1;
        $am[count($am)][‘e‘] = $am[count($am)-1][‘e‘];
        
        for($j=1;$j<=$PmTime*2-1;$j++){    
            if($j == 1){
                $pm[$j][‘b‘] = $pmstart + $time;        //开始时间
                $pm[$j][‘e‘] = $pm[$j][‘b‘] + $time;    //结束时间
            }else{
                $pm[$j][‘b‘] = $pm[$j-1][‘e‘];
                $pm[$j][‘e‘] = $pm[$j][‘b‘] + $time;
            }
            $pm[$j][‘d‘] = 0;
        }

        $pm[count($pm)+1][‘d‘] = 1;
        $pm[count($pm)][‘e‘] = $pm[count($pm)-1][‘e‘];
        
　　　　 //合并上下时间
        $TimeList = array_merge($am , $pm);
        echo "<hr>";
        $str = "\n\r";
        $k = 1;
        foreach($TimeList as $v){
            //d($v[‘b‘]);
            if($k == 5){
                return $str;
            }
            if($v[‘d‘] == 1 && time()<=$v[‘e‘]){
                 $str .= "<option>当前时间为下班时间，不能送餐！</option>";
                 $k++;
            }
            // if($v[‘d‘] == 2 && time()<=$v[‘e‘]){
                 // $str .= "<option>当前时间为下班时间，不能送餐！</option>";
                 // $k++;
            // }
            
            if($v[‘b‘] > time() ){
                $str .= "<option>".change($v[‘b‘]).‘--‘.change($v[‘e‘])."</option>";
                $k ++;
            }
        }
        return $str;
    }
    
    $dat = getoption($amstart,$amend,$pmstart,$pmend);
    d($dat);
    
    echo ‘<select name="some">‘;
    echo $dat;
    echo ‘</sclect>‘;
    
    
    
    function d($v){
        echo ‘<pre>‘;
        var_dump($v);
        echo ‘</pre>‘;
    }
    
    function change($date){
        //时间戳转换成时分秒
        return date(‘H:i‘,$date);
    }
?>