Phpsubstr () function to implement filtering the ending number as 4 _ PHP Tutorial

The phpsubstr () function filters 4 numbers at the end. Today, a customer needs to generate 400 phone numbers in batches at the starting position of 10000. at the beginning, I directly generate a number such as 10004, but merchants do not like this number, the question of filtering the ending number is that a customer needs to generate 400 phone numbers in batches. the starting position is 10000. when I start to generate the number directly, a number such as 10004 appears, but merchants do not like this number, the number indicating that the ending number is 4 is filtered. I can use substr ($ str,-1) = 4. let's look at the code below.

The code is as follows:

Include ("cn. php"); // database connection class. if you do not want to find it, go here. $ Db = new Db (); $ SQL = "select * from table name where isnew = 1 "; $ Query = $ Db-> query ($ SQL ); $ Rs = $ Db-> fetch ($ query, 0 ); USD I = 10000; Foreach ($ rs as $ v => $ vv) { If (substr ($ I,-1) = 4) { $ I ++; } $ SQL = "update table name set txtiphone = '$ I' where id =". $ vv ['id']; If ($ Db-> query ($ SQL )) { $ I ++; } } Echo 'batch update completed ';

Substr () functions

Syntax

substr(string,start,length)

Parameters	Description
String	Required. Specifies that a part of the string is to be returned.
Start	Required. Specifies where the string starts. Positive number-start at the specified position of the string Negative number-starting from the specified position at the end of the string 0-start at the first character in the string
Length	Optional. Specifies the length of the string to be returned. The default value is until the end of the string. Positive number-return from the position of the start parameter Negative number-return from the end of the string

This site Original tutorial reprint indicated Source: http://www.bKjia. c0m/phper/php.html

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