PHP面试题

Tip:在测试代码前设置PHP 文件字符编码  header("content-type:text/html;charset=utf-8");  

1.

1.1用PHP 获取当前时间并打印，打印格式：2018-2-09 22:19:30

 

2.

2.1 字符串转数组

     $str = "www.baidu.com";
   $arr_str = explode('.',$str);
   print_r($arr_str); //Array ( [0] => www [1] => baidu [2] => com )
   echo '<br />';
   print_r(str_split($str)); //Array ( [0] => w [1] => w [2] => w [3] => . [4] => b [5] => a [6] => i [7] => d [8] => u [9] => . [10] => c     　　[11] => o [12] => m )

2.2 数组转字符串

　　$arr = array('aaa','bbb','ccc');
　　print_r(implode(',',$arr)); //aaa,bbb,ccc
　　echo '<br />';
　　print_r(join('-',$arr)); //aaa-bbb-ccc

2.3 字符串截取

　　$str = "a,b,b,d.e,f.g/h?";
　　print_r(substr($str,0,3)); //a,b 单字节截取
　　echo '<br />';
　　$mb_str = "你好北京哈哈哈哈哈哈哈";
　　print_r(mb_substr($mb_str,0,3)); //你 多字节截取
　　echo '<br />';
　　print_r(mb_strcut($mb_str,0,6)); //你好 多字节截取

 2.4 字符串替换

    　$date = '02/26/2018';

　　echo preg_replace('/(\d+)\/(\d+)\/(\d+)/','$3/$1/$2',$date); 　　 //2003/08/26