为何这段代码在本机调试时出错apache错误信息~说是执行了非法操作~但上传至服务器之后就能解释


    function get_microtime()
    {
     list($usec,$sec)=explode(" ",microtime());
        return ((double)$usec+(double)$sec);
    }
    function str_rev($str)
    {
     //$cnt++;
     if(strlen($str)==1)
     return $str;
     $local_str=substr($str,strlen($str)-1,1);
     $local_str=$local_str . str_rev(substr($str,0,strlen($str)-1));
     return $local_str;
    }
    
    $teststr="";
    for($i=0;$i<25;$i++)
    {
     $teststr.="This is a string!";
    }
    //print("
".$teststr);
    
    //Benchmark native PHP string reversal
    $start_time=get_microtime();
    $test=strrev($teststr);
    $end_time=get_microtime();
    //print($test);
    $native_time=round((float)(($end_time-$start_tme)*1000),2);
    print("
Native processing time:{$native_time}ms
");
    
    //Benchmark recursive custom string reversal
    $start_time=get_microtime();
    $test=str_rev($teststr);
    $end_time=get_microtime();
    $recurse_time=round((float)(($end_time-$start_time)*1000),2);
    print("Custom function pricessint time:{$recurse_time}ms
");
    $speed_factor=$recurse_time/$native_time;
    print("Navite string reversal is approximately ".$speed_factor." quicker.");
    //print($test);




服务器文件：
http://www.fs123.com/4list2.php


$test=str_rev($teststr);
是执行该表达式是就会出现~~~删掉就没问题~~但上传至服务器就没有错误信息~~~

是不是php.ini或apache还没设置好~~