Recommended 10 courses on looping creation

The difficulty of random generation is how to avoid collisions, some people say with md5,guid these mechanisms ah, of course, but as accounts, look at the chaos, and the generation of bits too long. This method only need to solve the concurrent collisions within 1 seconds, because the fixed head is Unixtime time, accurate to the second, more than 1 seconds, the head of the time must have changed. At the same time this method can also be generated by the user random order number. The test condition is to create 10,000 random accounts (in milliseconds), 0 collisions, and 100,000 about 0-3 collisions with a loop. No internet company should be able to create so many accounts at the same time, so it's enough to deal with the size of billions of PV. ~~~.java//Auto generate random username//test, loop Create 10,000 random accounts, 0 collisions, 100,000 about 0-3 collisions, enough to cope with future level billions of PV private function Genusernumber () {$chars = " 01234567

1. Generation of PHP random username account

Introduction: Random generation difficulty is how to avoid collisions, some people say with md5,guid these mechanisms ah, of course, but as accounts, look at the chaos, and the generation of bits too long. This method only need to solve the concurrent collisions within 1 seconds, because the fixed head is Unixtime time, accurate to the second, more than 1 seconds, the head of the time must have changed. At the same time this method can also be generated by the user random order number. The test condition is to create 10,000 random accounts (in milliseconds), 0 collisions, and 100,000 about 0-3 collisions with a loop. There should be no internet company in ...

2. Generation of PHP random username account

Introduction: Random generation difficulty is how to avoid collisions, some people say with md5,guid these mechanisms ah, of course, but as accounts, look at the chaos, and the generation of bits too long. This method only need to solve the concurrent collisions within 1 seconds, because the fixed head is Unixtime time, accurate to the second, more than 1 seconds, the head of the time must have changed. At the same time this method can also be generated by the user random order number. The test condition is to create 10,000 random accounts (in milliseconds), 0 collisions, and 100,000 about 0-3 collisions with a loop. There should be no internet company in ...

3. Whether I really have nothing lyrics PHP loop to detect if a directory exists and create a loop to create a directory

Introduction: Whether I really have nothing lyrics: whether I really have nothing lyrics PHP loop to detect whether a directory exists and create a loop to create a directory: Loop Create directory method this generates the Image.gif directory copy code code as follows: $filepath = "test/upload/2010/ Image.gif "; Mk_dir ($filepath); Loop Create directory function Mk_dir ($dir, $mode = 0755) {if (Is_dir ($dir) | | @mkdir ($DIR, $mode)) return true; if

4. PHP looping create multi-level catalogs sample

Summary: PHP Looping Create a multi-level catalog sample

5. PHP loop to detect if the directory exists and create (Loop Create directory) _php tutorial

Summary: The PHP loop detects if a directory exists and is created (looping through the creation of directories). Loop Create Directory method this generates the Image.gif directory copy code code as follows: $filepath = "Test/upload/2010/image.gif"; Mk_dir ($filepath); Looping Create directory function Mk_di

6. PHP Loop Create directory sample share (PHP create multilevel directory) _php tutorial

Introduction: PHP Loop Create directory sample sharing (PHP create multilevel directory). Copy the code as follows: function Mk_dir ($dir, $mod = 0777) {if (!is_dir ($dir) | | mkdir ($DIR, $mod)) {if (!mk_dir (DirName ($dir, $mod))) {return false;} } return mkdir ($dir, $mo

7. PHP Loop Create directory sample share _php tutorial

Summary: PHP loop Create directory sample sharing. This article mainly introduces the PHP loop Create directory example, the principle is to constantly try to create the upper directory, and so on, the need for friends can refer to the following code: function Mk_dir ($d

8. PHP Loop Create directory _php tutorial

Summary: PHP loops Create a directory. The code is taken from thinkphp: function Mk_dir ($dir, $mod = 0777) {if (!is_dir ($dir) | | mkdir ($DIR, $mod)) {if (!mk_dir ($dir, $mod )) {return false;}} return mkdir ($dir, $mo

9. Discuz Excuse Me

Introduction: Discuz asked me to write a for loop to create a discuz group script, but he had to interface a little to understand, trouble understand directly tell me how to simulate------solution--------------------PHP code<!--{ Loop $_g[' cache ' [' grouptype '] [' first '] $groupid $group}--&g

10. Write a PHP data, automatically cycle to create MySQL table, 20 points both hands

Introduction: Write a PHP file, automatically cycle the creation of MySQL table, 20 both hands write a PHP file, automatically cycle the creation of MySQL table, 20 both hands table name definition: table20100531,table20100601,table20100602 .... table20101231 field: Name text date1 int 11 The table that was built for 1 years, what's the matter with you????

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