PHP笔试题,整理自网络
1.取出三个数中最大的一个
function myMax($a,$b,$c){ $max=($a>=$b)?$a:$b; $max=($max>=$c)?$max:$c; return $max; } echo myMax(4,2,3);
2.用PHP打印出前一天的时间,打印格式是2007年5月10日22:21:21
date_default_timezone_set('Asia/Shanghai'); echo date('Y-m-d H:i:s',strtotime('-1 day'));3. a.html和b.html在同一个文件夹下,打开a.html五秒钟后,自动跳转到b.html
php实现:
sleep(5);js实现:
function a2b(){ window.location="b.html"; } setTimeout('a2b()',5000);4.显示客户端和服务器端ip
echo $_SERVER["REMOTE_ADDR"]; echo gethostbyname("www.baidu.com");5.
$str1 = null; $str2 = false; echo $str1==$str2?'yes':'no'; //yes echo $str1===$str2?'yes':'no';//no $str3 = ''; $str4 = 0; echo $str3==$str4?'yes':'no'; //yes echo $str3===$str4?'yes':'no'; //no $str5 = 0; $str6 = '0'; echo $str5==$str6?'yes':'no'; //yes echo $str5===$str6?'yes':'no'; //no6.获取服务器时间
<?php date_default_timezone_set('Asia/Shanghai'); function get_time($server){ $data = "HEAD / HTTP/1.1\r\n"; $data .= "Host: $server\r\n"; $data .= "Connection: Close\r\n\r\n"; $fp = fsockopen($server, 80); fputs($fp, $data); $resp = ''; while ($fp && !feof($fp)) $resp .= fread($fp, 1024); preg_match('/^Date: (.*)$/mi',$resp,$matches); return strtotime($matches[1]); } echo date('Y-m-d H:i:s',get_time("www.baidu.com")); ?>7.求a,b 两文件的相对路径
function getRelative($a , $b){ $arr_a = explode("/" , $a) ; $brr_b = explode("/" , $b) ; $i = 1 ; while (true) { if($arr_a[$i] == $brr_b[$i]) { $i ++ ; } else { break ; } } $c = count($brr_b) ; $d = count($arr_a) ; $e = ($c>$d)?$c:$d ; $str1 = ''; $str2 = ''; for ($j = $i ;$j<$e ;$j++) { if(isset($arr_a[$j])) { if($j<($d-1)){ $str1 .= $arr_a[$j] . "/" ; } else { $str1 .= $arr_a[$j] ; } } if(isset($brr_b[$j])) { $str2 .= "../" ; } } return $str2 . $str1 ; } $a = "www.baidu.com/1/2/a.php" ; $b = "www.baidu.com/1/3/4/b.php" ; $relative = getRelative($a,$b) ; echo $relative;