PHP substr() function implements filtering with mantissa 4

PHP substr() function implements filtering with mantissa 4_PHP tutorial

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Release： 2016-07-13 10:55:34

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Today a customer wants to generate 400 phone numbers in batches. The starting position is 10000. At the beginning, I directly generated numbers such as 10004. However, the merchants did not like this number, so they said that the filtering number ends in 4. Let me think about it. This can be achieved by using substr($str,-1)==4. See the code below.

代码如下	复制代码
include("cn.php"); //数据库连接类，这里不说了自己去找找吧。 $Db = new Db(); $sql ="select * from 表名 where isnew=1"; $query = $Db->query( $sql ); $rs = $Db->fetch( $query ,0); $i=10000; foreach( $rs as $v => $vv ) { if( substr($i,-1)==4 ) { $i++; } $sql ="update 表名 set txtiphone= '$i' where id=".$vv['id']; if( $Db->query( $sql ) ) { $i++; } } echo '批量更新完成';

About the substr() function

Grammar

substr(<em>string</em>,<em>start</em>,<em>length</em>)

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Parameters	Description

参数	描述
string	必需。规定要返回其中一部分的字符串。
start	必需。规定在字符串的何处开始。正数 - 在字符串的指定位置开始负数 - 在从字符串结尾的指定位置开始 0 - 在字符串中的第一个字符处开始
length	可选。规定要返回的字符串长度。默认是直到字符串的结尾。正数 - 从 start 参数所在的位置返回负数 - 从字符串末端返回

参数

描述

string

必需。规定要返回其中一部分的字符串。

start

必需。规定在字符串的何处开始。

正数 - 在字符串的指定位置开始
负数 - 在从字符串结尾的指定位置开始
0 - 在字符串中的第一个字符处开始

length

可选。规定要返回的字符串长度。默认是直到字符串的结尾。

正数 - 从 start 参数所在的位置返回
负数 - 从字符串末端返回

string Required. Specifies a part of the string to be returned.

start

Required. Specifies where in the string to begin.

Positive number - starts at the specified position in the string
Negative number - starts at the specified position from 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 is until the end of the string.

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632231.htmlTechArticleToday a customer wanted to generate 400 phone calls in batches. The starting position was No. 10000. When I started to generate it directly, something like this appeared. But businessmen don’t like the number 10004, so the filtering mantissa is...