crypt(const char *key, const char *salt) function is one of the C language functions and returns a string encrypted using DES, Blowfish or MD5. This function behaves differently on different operating systems, and some operating systems support more than one algorithm type. At installation time, PHP checks what algorithms are available and what algorithms are used.
This article mainly introduces PHP to use crypt() function for encryption in detail. It has certain reference value. Interested friends can refer to it
1. Code
<?php $str = '应用crypt()函数进行单向加密!'; //声明字符串变量$str echo '加密前$str的值为：'.$str; $crypttostr = crypt($str); //对变量$str加密 echo '<p>加密后$str的值为：'.$crypttostr; //输出加密后的变量 ?>
2. Running result
The parameter does not contain salt, The ciphertext obtained by encryption is different every time.
The value of $str before encryption is: apply the crypt() function for one-way encryption!
The value of $str after encryption is: $1$Re4.Gg4.$D.yd00xX0fFfIfp6KrKGN0
3. Code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>使用crypt函数进行数据验证</title>
<style type="text/css">
<!--
body,td,th {
font-size: 12px;
}
body {
margin-left: 10px;
margin-top: 10px;
margin-right: 10px;
margin-bottom: 10px;
}
.STYLE1 {
font-size: 14px;
font-weight: bold;
}
-->
</style>
</head>
<body>
<p align="center">
<?php
$conn = mysql_connect("localhost","root","root") or die("数据库链接错误".mysql_error());
mysql_select_db("db_database21",$conn) or die("数据库访问错误".mysql_error());
mysql_query("set names gb2312");
?>
</p>
<table width="777" height="587" border="0" align="center" cellpadding="0" cellspacing="0" background="images/bg.jpg">
<tr>
<td width="149" height="200"> </td>
<td width="448"> </td>
<td width="158"> </td>
</tr>
<tr>
<td height="187"> </td>
<td align="center" valign="middle"> <form id="form1" name="form1" method="post" action="index.php">
<table height="129" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="100" height="30" align="right" valign="middle" scope="col"><span class="STYLE1">用户名：</span></td>
<td width="100" height="30" align="left" valign="middle" scope="col"><label for="textfield"></label>
<input name="username" type="text" id="username" size="24" /></td>
<td width="100" align="center" valign="middle" scope="col"> </td>
</tr>
<tr>
<td height="30" align="right" valign="middle" class="STYLE1" scope="col">密码：</td>
<td height="30" align="left" valign="middle" scope="col"><input name="password" type="password" id="password" size="25" /></td>
<td align="center" valign="middle" scope="col"> </td>
</tr>
<tr>
<td height="40" colspan="3" align="center" valign="middle" scope="col"><input type="image" name="imageField" src="images/bg2.JPG" />
<input type="image" name="imageField2" src="images/bg1.JPG" onclick="form.reset();return false;" /></td>
</tr>
</table>
</form>
<?php
if(trim($_POST[username])!= "" and trim($_POST[password])!= ""){
$usr = crypt(trim($_POST[username]),$_POST[username]);
$pwd = crypt(trim($_POST[password]),$_POST[password]);
$sql = "select * from tb_user where username = '".$usr."' and password='".$pwd."'";
$rst = mysql_query($sql,$conn);
$result=mysql_num_rows($rst);
if($result>0){
echo "<font color='red'>用户登录成功。</font>";
}else{
echo "<font color='green'>用户登录失败!</font>";
}
}else{
echo "请认真填写用户名和密码！";
}
?></td>
<td> </td>
</tr>
<tr>
<td height="200"> </td>
<td> </td>
<td> </td>
</tr>
</table>
</body>
</html>
4. Running results
.
The above is the detailed content of php crypt() encryption function usage example. For more information, please follow other related articles on the PHP Chinese website!
PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AMPHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AMPHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.
Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AMPHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.
PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AMPHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.
PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AMPHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AMPHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.
How does PHP handle object cloning (clone keyword) and the __clone magic method?Apr 17, 2025 am 12:24 AMIn PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.
PHP vs. Python: Use Cases and ApplicationsApr 17, 2025 am 12:23 AMPHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
SublimeText3 English version
Recommended: Win version, supports code prompts!
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
