This article mainly introduces the usage of common form validation classes in PHP. It analyzes common PHP validation techniques for form elements with examples. Friends in need can refer to the following.
The examples in this article describe the usage of common PHP form validation classes. Share it with everyone for your reference. The details are as follows:
<?php /** * 页面作用:常用表单验证类 * 作 者:欣然随风 * QQ:276624915 */ class class_post { //验证是否为指定长度的字母/数字组合 function fun_text1($num1,$num2,$str) { Return (preg_match("/^[a-zA-Z0-9]{".$num1.",".$num2."}$/",$str))?true:false; } //验证是否为指定长度数字 function fun_text2($num1,$num2,$str) { return (preg_match("/^[0-9]{".$num1.",".$num2."}$/i",$str))?true:false; } //验证是否为指定长度汉字 function fun_font($num1,$num2,$str) { // preg_match("/^[\xa0-\xff]{1,4}$/", $string); return (preg_match("/^([\x81-\xfe][\x40-\xfe]){".$num1.",".$num2."}$/",$str))?true:false; } //验证身份证号码 function fun_status($str) { return (preg_match('/(^([\d]{15}|[\d]{18}|[\d]{17}x)$)/',$str))?true:false; } //验证邮件地址 function fun_email($str){ return (preg_match('/^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,4}$/',$str))?true:false; } //验证电话号码 function fun_phone($str) { return (preg_match("/^((\(\d{3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}$/",$str))?true:false; } //验证邮编 function fun_zip($str) { return (preg_match("/^[1-9]\d{5}$/",$str))?true:false; } //验证url地址 function fun_url($str) { return (preg_match("/^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/",$str))?true:false; } // 数据入库 转义 特殊字符 传入值可为字符串 或 一维数组 function data_join(&$data) { if(get_magic_quotes_gpc() == false) { if (is_array($data)) { foreach ($data as $k => $v) { $data[$k] = addslashes($v); } } else { $data = addslashes($data); } } Return $data; } // 数据出库 还原 特殊字符 传入值可为字符串 或 一/二维数组 function data_revert(&$data) { if (is_array($data)) { foreach ($data as $k1 => $v1) { if (is_array($v1)) { foreach ($v1 as $k2 => $v2) { $data[$k1][$k2] = stripslashes($v2); } } else { $data[$k1] = stripslashes($v1); } } } else { $data = stripslashes($data); } Return $data; } // 数据显示 还原 数据格式 主要用于内容输出 传入值可为字符串 或 一/二维数组 // 执行此方法前应先data_revert(),表单内容无须此还原 function data_show(&$data) { if (is_array($data)) { foreach ($data as $k1 => $v1) { if (is_array($v1)) { foreach ($v1 as $k2 => $v2) { $data[$k1][$k2]=nl2br(htmlspecialchars($data[$k1][$k2])); $data[$k1][$k2]=str_replace(" "," ",$data[$k1][$k2]); $data[$k1][$k2]=str_replace("\n","<br>\n",$data[$k1][$k2]); } } else { $data[$k1]=nl2br(htmlspecialchars($data[$k1])); $data[$k1]=str_replace(" "," ",$data[$k1]); $data[$k1]=str_replace("\n","<br>\n",$data[$k1]); } } } else { $data=nl2br(htmlspecialchars($data)); $data=str_replace(" "," ",$data); $data=str_replace("\n","<br>\n",$data); } Return $data; } } ?>
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。

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。


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