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The latest classic PHP interview questions and answers in 2019, a must-read for PHP programmers
The latest classic PHP interview questions and answers in 2019, a must-read for PHP programmers
1、用最少的代码写一个求3值最大值的函数.
function who($a,$b,$c) {
return $a > $b ? ($a > $c ? $a : $c) : ($b > $c ? $b : $c);
}
echo who(33,53,12);2、求两个日期的差数，例如2007-2-5 ~ 2007-3-6 的日期差数
$date1 = strtotime('2013-09-09'); $date2 = strtotime('2011-12-11'); echo ($date1-$date2)/(24*3600);
3、函数实现-字符串“open_door" 转换成 “OpenDoor"、"make_by_id" 转换成 "MakeById"。
function towords($str) {
$newStr = str_replace("_"," ",$str);
$newStr = ucwords($str);
$newStr = str_replace(" ","_",$str);
return $newStr;
}
echo towords("open_door");4、echo count('abc'); 输出的结果是什么
结果为1
5、用pHp写出显示客户端Ip与服务器Ip的代码
echo getenv('REMOTE_ADDR'); echo getenv('SERVER_ADDR'); echo gethostbyname('<a href="http://www.baidu.com/">www.baidu.com</a>');
6、 error_reporting(2047)什么作用?
相当于 error_reporting('E_ALL'); 输出所有的错误
7、打开php.ini中的Safe_mode，会影响哪些参数?至少说出6个。
此模块打开时，php将检查当前脚本的拥有者是否和被操作文件的拥有者相同，因此，将影响文件操作类函数，程序执行函数 (program Execution Functions)。这些函数有.pathinfo,basename,fopen,system,exec,proc_open 等函数;
8、请写一个函数验证电子邮件的格式是否正确(要求使用正则)
function checkEmail($mail){
$reg= '/^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$/';
$rst = preg_match($reg,$mail);
if($rst){
return TRUE;
} else {
return FALSE;
}
}9、写个函数用来对二维数组排序。
array_multisort()
10、问题：请用最简单的语言告诉我PHP是什么?
回答：PHP全称：Hypertext Preprocessor，是一种用来开发动态网站的服务器脚本语言。
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