


Regular expression is a grammatical rule that describes the result of a string. It is a specific formatting pattern that can match, replace, and intercept matching strings. Commonly used languages basically have regular expressions, such as JavaScript, java, etc. In fact, as long as you understand the regular use of one language, it is relatively simple to use the regular rules of other languages. Today I will introduce to you the development examples of common regular expression verification in PHP!
First download the PHP regular expression library we need to use in this course: http://www.php.cn/xiazai/leiku/710
Find after the download is complete Unzip the php class file we need to our local directory and create a new php file!
After completion, we need to call this class in the new php file and instantiate the class:
<?php include_once "codezz.php"; //引入类文件 $obj = new Verify; //实例化该类 //验证数据,1为正确,0为错误 echo "用户名验证:".$obj->isNames("啧啧啧中文网")."<br>"; echo "密 码验证:".$obj->isPWD("123456")."<br>"; echo "邮 箱验证:".$obj->isEmail("555@qq.com")."<br>"; echo "电 话验证:".$obj->isTelephone("11111111111")."<br>"; echo "手机号验证:".$obj->isMobile("13612365892")."<br>"; echo "邮 编验证:".$obj->isPostcode("138912")."<br>"; echo "IP地址验证:".$obj->isIP("138.9.2.1")."<br>"; echo "身份证验证:".$obj->isIDcard("1586548466549464")."<br>"; echo "URL地址验证:".$obj->isURL("http://www.php.cn/")."<br>"; ?>
Run the file and the result will be as shown below:
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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