PHP Technician-Oral Review PHP Chapter

PHP Technician--Interview summary PHP
1. Realize Chinese string interceptionNo garbled method
Open the mbstring extension, and then customize the function:

 

2. Print the day before using PHP


  

3, does not apply the third variable Exchange 2 variables value


   

4. Convert 1234567890 to 1,234,567,890


Header (' Content-type:text/html:charset=utf-8 '); $str = ' 1234567890 ';//invert string $str = Strrev ($STR);//Comma separated by 098, 765,432,1, $str = Chunk_split ($str, 3, ', ');//Invert $str = Strrev ($STR);//Remove Left, $str = LTrim ($str, ', '); Echo $str;


5. Implement UTF8 string inversion
Cannot use Strrev, Chinese will be wrong


function Strrev_utf8 ($STR) {return join ("", Array_reverse (Preg_split ("//u", $str)));} $str = "I am a good boy"; Echo Strrev_utf8 ($STR); 6, take the file extension of the URL, as many as possible to implement the method $str = "www.baidu.com/index.php"; function Get_ext1 ( $STR) {return strrchr ($str, '. ');} function Get_ext2 ($str) {return substr ($str, Strrpos ($str, '. '));} function Get_ext3 ($str) {$str = PathInfo ($STR); return $str [' extension '];} function Get_ext4 ($str) {$arr = explode ('. ', $str); return $arr [Count ($arr)-1];} function Get_ext5 ($str) {$pattern = '/^[^\.] +\. ([\w]+) $/'; return preg_replace ($pattern, ' ${1} ', basename ($STR));}


7. Write a function to convert the string Open_door to Opendoor


$str = "Open_door", function Change_str ($str) {$arr = explode (' _ ', $str); $arr = Array_map (' Ucfirst ', $arr); return implode ( ", $arr);} echo Change_str ($STR);


8. Single case mode


    

10. Get the file name extension from a completed URL


     

11. Write a function to facilitate all files and subfolders under a folder
      

12. The principle of unlimited classification in the forum
First design the database table


CREATE TABLE category (cate_id int unsigned not NULL auto_increment primary key,cat_name varchar (in) NOT null default ', PA rent_id int unsigned NOT NULL default 0) Engine=innodb Charset=utf8; then recursive implementation with function, infinite classification function tree ($arr, $pid =0, $level =0) { Static $list = Array (), foreach ($arr as $v) {//If it is a top-level classification, then $list//the node as the root and traverse its child node if ($v [' parent_id '] = = $pid) {$v [' Level '] = $level; $list [] = $v; tree ($arr, $v [' cat_id '], $level + 1);}} return $list;}


13, calculate the relative path of 2 files
 
        1) {$i + = 1; $head = Array_shift ($monkey);//Dequeue the first if ($i% $m! = 0) {//If it is not a multiple of M, return the tail, otherwise Array_push ($monkey, $head);}} return $monkey [0];} echo King (10,7);


15, PHP implementation of two-way queue
 
        

I hope this article on the vastPHP DeveloperHelpful, thanks for reading this article.
 
