blocks|key|3051482|text|在PHP5.2.8版本中，对我起作用的是打开php.ini并通过删除;来允许php_mcrypt.dll扩展，即更改：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3051483|;extension=php_mcrypt.dll到extension=php_mcrypt.dll|3051484|entityMap^0|M|7|Y|1|12|E|0|0|P|Q|O|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

What had worked for me with PHP version 5.2.8, was to open up <code>php.ini</code> and allow the <code>php_mcrypt.dll</code> extension by removing the <code>;</code>, i.e. changing:

<code>;extension=php_mcrypt.dll</code> to <code>extension=php_mcrypt.dll</code>

blocks|key|3051593|text|如果你最近更新到了ubuntu+14.04，这里是这个问题的修复：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3051594|$+sudo+mv+/etc/php5/conf.d/mcrypt.ini+/etc/php5/mods-available/
$+sudo+php5enmod+mcrypt
$+sudo+service+apache2+restart|code-block|syntax|javascript|3051595|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you have recently updated to ubuntu 14.04 here is the fix to this problem:

<pre><code>$ sudo mv /etc/php5/conf.d/mcrypt.ini /etc/php5/mods-available/
$ sudo php5enmod mcrypt
$ sudo service apache2 restart
</code></pre>

blocks|key|311379|text|对于windows|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311380|;extension=php_mcrypt.dll+to+extension=php_mcrypt.dll+
+then+restart+your+apache+server|code-block|syntax|javascript|311381|对于Redhat|311382|sudo+yum+install+php55-mcrypt+//if+php5.5
sudo+yum+install+php-mcrypt+//if+less+than+5.4
sudo+service+httpd+restart+//if+apache+2.4
sudo+/etc/init.d/httpd+restart+//if+apache+2.2+or+less|311383|对于Ubuntu|311384|sudo+apt-get+install+php5-mcrypt
sudo+service+apache2+restart+//if+server+not+reloaded+automatically+|311385|还是不能工作吗？|311386|311387|+sudo+php5enmod+mcrypt+&&+sudo服务apache2重启|blockquote|311388|311389|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|15|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|W|$]]

For windows

<pre><code>;extension=php_mcrypt.dll to extension=php_mcrypt.dll 
 then restart your apache server
</code></pre>

For Redhat

<pre><code>sudo yum install php55-mcrypt //if php5.5
sudo yum install php-mcrypt //if less than 5.4
sudo service httpd restart //if apache 2.4
sudo /etc/init.d/httpd restart //if apache 2.2 or less
</code></pre>

For Ubuntu

<pre><code>sudo apt-get install php5-mcrypt
sudo service apache2 restart //if server not reloaded automatically 
</code></pre>

Still not working?

<blockquote>
 sudo php5enmod mcrypt &amp;&amp; sudo service apache2 restart
</blockquote>

blocks|key|3051824|text|如果您使用的是PHP+7.2或更高版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3051825|3051826|此函数在PHP7.1.0中已被弃用，并在PHP7.2.0中被删除。|blockquote|3051827|3051828|3051829|来源：http://php.net/manual/en/function.mcrypt-encrypt.php|offset|length|3051830|因此，您必须替换php代码并找到一个不使用mcrypt的解决方案。|3051831|或者，我刚刚发现，您仍然可以在PHP+7.2.0中使用mcrypt，但您必须将其安装为PHP扩展社区库。(https://pecl.php.net/)|3051832|在Debian/Ubuntu+Linux发行版上：|3051833|sudo+apt-get+-y+install+gcc+make+autoconf+libc-dev+pkg-config
sudo+apt-get+-y+install+php7.2-dev
sudo+apt-get+-y+install+libmcrypt-dev|code-block|syntax|javascript|3051834|然后：|3051835|sudo+pecl+install+mcrypt-1.0.1|3051836|来源：https://www.techrepublic.com/article/how-to-install-mcrypt-for-php-7-2/|3051837|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.mcrypt-encrypt.php|1|https://pecl.php.net/|2|https://www.techrepublic.com/article/how-to-install-mcrypt-for-php-7-2/^0|0|0|0|0|0|3|1G|0|0|0|1H|L|1|0|0|0|0|0|3|1Z|2|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1G|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1J|8|@]|9|@$J|1K|K|1L|1|1M]]|A|$]]|$1|L|3|M|5|6|7|1N|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1O|8|@]|9|@$J|1P|K|1Q|1|1R]]|A|$]]|$1|P|3|Q|5|6|7|1S|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1T|8|@]|9|@]|A|$U|V]]|$1|W|3|X|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|T|7|1V|8|@]|9|@]|A|$U|V]]|$1|10|3|11|5|6|7|1W|8|@]|9|@$J|1X|K|1Y|1|1Z]]|A|$]]|$1|12|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]|1A|$5|15|16|17|A|$18|1B]]|1C|$5|15|16|17|A|$18|1D]]]]

If you are using PHP 7.2 or up:

<blockquote>
 This function was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0.
</blockquote>

source: <a href="http://php.net/manual/en/function.mcrypt-encrypt.php" rel="noreferrer">http://php.net/manual/en/function.mcrypt-encrypt.php</a>

So you have to replace the php code and find a solution without mcrypt.

Or, I just found out, you can STILL use mcrypt in PHP 7.2.0, but you have to install it as a PHP Extension Community Library. (<a href="https://pecl.php.net/" rel="noreferrer">https://pecl.php.net/</a>) 

On Debian/Ubuntu Linux distros:

<pre><code>sudo apt-get -y install gcc make autoconf libc-dev pkg-config
sudo apt-get -y install php7.2-dev
sudo apt-get -y install libmcrypt-dev
</code></pre>

then:

<pre><code>sudo pecl install mcrypt-1.0.1
</code></pre>

Source: <a href="https://www.techrepublic.com/article/how-to-install-mcrypt-for-php-7-2/" rel="noreferrer">https://www.techrepublic.com/article/how-to-install-mcrypt-for-php-7-2/</a>

blocks|key|3265128|text|您没有安装mcrypt库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3265129|有关详细信息，请参阅http://www.php.net/manual/en/mcrypt.setup.php。|offset|length|3265130|如果您使用的是共享主机，您可以要求您的提供商安装它。|3265131|3265132|在OSX中，您可以通过自制软件轻松安装mcrypt|3265133|brew+install+php54-mcrypt+--without-homebrew-php|code-block|syntax|javascript|3265134|然后将此行添加到/etc/php.ini。|3265135|extension="/usr/local/Cellar/php54-mcrypt/5.4.24/mcrypt.so"|3265136|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/mcrypt.setup.php^0|0|A|19|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|18|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|19|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1B|8|@]|9|@]|A|$N|O]]|$1|T|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

You don't have the mcrypt library installed.

See <a href="http://www.php.net/manual/en/mcrypt.setup.php" rel="noreferrer">http://www.php.net/manual/en/mcrypt.setup.php</a> for more information.

If you are on shared hosting, you can ask your provider to install it.

<hr>

In OSX you can easily install mcrypt via homebrew

<pre><code>brew install php54-mcrypt --without-homebrew-php
</code></pre>

Then add this line to /etc/php.ini.

<pre><code>extension="/usr/local/Cellar/php54-mcrypt/5.4.24/mcrypt.so"
</code></pre>

blocks|key|314304|text|在Ubuntu下，我遇到了这个问题，并用以下方法解决了它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314305|$+sudo+apt-get+install+php5-mcrypt
$+sudo+service+apache2+reload|code-block|syntax|javascript|314306|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Under Ubuntu I had the problem and solved it with

<pre><code>$ sudo apt-get install php5-mcrypt
$ sudo service apache2 reload
</code></pre>

blocks|key|314330|text|在ubuntu+14.10上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314331|安装模块mcrypt|314332|sudo+apt+install+php5-mcrypt|code-block|syntax|javascript|314333|在apache2上启用模块mcrypt|314334|sudo+a2enmod+mcrypt|314335|重新加载模块配置|314336|sudo+service+apache2+restart|314337|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

On ubuntu 14.10 :

Install module mcrypt

<pre><code>sudo apt install php5-mcrypt
</code></pre>

Enable module mcrypt on apache2

<pre><code>sudo a2enmod mcrypt
</code></pre>

Reload module configuration

<pre><code>sudo service apache2 restart
</code></pre>

blocks|key|311412|text|在Linux+Mint17.1上，Rebecca+-调用未定义的函数mcrypt_create_iv...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311413|通过将以下行添加到php.ini中即可解决|311414|extension=mcrypt.so|code-block|syntax|javascript|311415|在那之后，一个|311416|service+apache2+restart|311417|解决了..。|311418|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

On Linux Mint 17.1 Rebecca - Call to undefined function mcrypt_create_iv...

Solved by adding the following line to the php.ini

<pre><code>extension=mcrypt.so
</code></pre>

After that a 

<pre><code>service apache2 restart
</code></pre>

solved it...

blocks|key|3265485|text|我在缺失mcrypt的PHP7版本中也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3265486|这对我很有效。|3265487|sudo+apt-get+update
sudo+apt-get+install+mcrypt+php7.0-mcrypt
sudo+apt-get+upgrade
sudo+service+apache2+restart+(if+needed)|code-block|syntax|javascript|3265488|entityMap^0|B|4|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

I had the same issue for PHP 7 version of missing mcrypt.

This worked for me. 

<pre><code>sudo apt-get update
sudo apt-get install mcrypt php7.0-mcrypt
sudo apt-get upgrade
sudo service apache2 restart (if needed)
</code></pre>

blocks|key|3051408|text|是否启用了mcrypt？您可以使用phpinfo()查看它是否是。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3051409|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.phpinfo.php^0|H|9|H|9|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Is mcrypt enabled? You can use <a href="http://php.net/manual/en/function.phpinfo.php" rel="nofollow noreferrer"><code>phpinfo()</code></a> to see if it is.

blocks|key|3265194|text|还有一件事:如果您通过Apache等web服务器提供PHP服务，请尝试重新启动web服务器。这将“重置”任何可能存在的PHP模块，激活新的配置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3265195|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

One more thing: if you are serving PHP via a web server such as Apache, try restarting the web server. This will "reset" any PHP modules that might be present, activating the new configuration.

blocks|key|3051530|text|假设您使用的是debian+linux+(我使用的是Linux+mint+12，问题出在我ssh到的Ubuntu+12.04.1+LTS服务器上)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3051531|我建议采纳@dkamins的建议，并确保您的php5安装上已安装并激活了mcrypt。使用"sudo+apt-get+install+php5-mcrypt“进行安装。下面是我的笔记。|3051532|使用PHP版本PHP+Version+5.3.10-1ubuntu3.4，如果您按照@John+Conde的建议打开phpinfo()，您可以通过在web服务器上创建测试文件来做到这一点(例如，通过浏览器在服务器上的任何位置都可以访问)创建状态页面testphp.php|offset|length|style|CODE|3051533|在浏览器中打开状态页时，我发现状态页上没有启用或禁用状态。当我打开@Anthony+Forloney提到的php.ini文件时，我想取消对;extension=php_mcrypt.dll+to+extension=php_mcrypt.dll的注释|3051534|我来回切换并重新启动了Apache+(我正在运行Apache2，你可以在我的设置中使用sudo+/etc/init.d/apache2+restart重启，或者当你在那个目录中时，我相信只有sudo+restart+)，有改变也没有改变，但一切都是无效的。我采纳了@dkamins的建议，使用"sudo+apt-get+install+php5-mcrypt“安装了这个包，然后如上所述重新启动了apache。然后我的错误就消失了，我的应用程序运行得很好。|3051535|entityMap^0|0|0|7|T|0|1X|1H|0|17|W|2N|C|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@$F|S|G|T|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$F|V|G|W|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@$F|Y|G|Z|H|I]|$F|10|G|11|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|O|$]]

Assuming you are using debian linux (I'm using Linux mint 12, problem was on Ubuntu 12.04.1 LTS server I ssh'ed into.)

I suggest taking @dkamins advice and making sure you have mcrypt installed and active on your php5 install. Use "sudo apt-get install php5-mcrypt" to install. My notes below.

Using PHP version <code>PHP Version 5.3.10-1ubuntu3.4</code>, if you open phpinfo() as suggested by @John Conde, which you do by creating test file on web server (e.g. create status page testphp.php with just the contents "" anywhere accessible on the server via browser)

I found no presence of enabled or disabled status on the status page when opened in browser. When I then opened the php.ini file, mentioned by @Anthony Forloney, thinking to uncomment <code>;extension=php_mcrypt.dll to extension=php_mcrypt.dll</code>

I toggled that back and forth and restarted Apache (I'm running Apache2 and you can restart in my setup with <code>sudo /etc/init.d/apache2 restart</code> or when you are in that directory just <code>sudo restart</code> I believe) 
with change and without change but all no go. I took @dkamins advice and went to install the package with "sudo apt-get install php5-mcrypt" and then restarted apache as above. Then my error was gone and my application worked fine.

blocks|key|314374|text|如果您正在使用php5-fpm，请记得在安装mcrypt之后重新启动它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314375|服务php5-fpm重启|314376|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If you are using php5-fpm do remeber to restart it, after installing mcrypt

service php5-fpm restart

blocks|key|311486|text|如果你使用ubuntu+14.04，这里是解决这个问题的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311487|首先检查php5-mcryp是否已安装apt-get+install+php5-mcrypt|offset|length|style|CODE|311488|如果已安装，只需运行这两个命令或安装并运行这两个命令|311489|$+sudo+php5enmod+mcrypt
$+sudo+service+apache2+restart|code-block|syntax|javascript|311490|我希望它能起作用。|311491|entityMap^0|0|J|R|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|X|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

If you using ubuntu 14.04 here is the fix to this problem:

First check php5-mcryp is already installed <code>apt-get install php5-mcrypt</code>

If installed, just run this two command or install and run this two command

<pre><code>$ sudo php5enmod mcrypt
$ sudo service apache2 restart
</code></pre>

I hope it will work.

blocks|key|3051937|text|我的环境:+Windows+10、Xampp控制面板v3.2.4、PHP+7.3.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3051938|第1步:从此处下载适合您系统的版本：https://pecl.php.net/package/mcrypt/1.0.3/windows|offset|length|3051939|步骤2:解压php_mcrypt.dll文件并将其复制到../xampp/php/ext/|3051940|步骤3:打开../xampp/php/php.ini文件并添加一行extension=php_mcrypt.dll|style|CODE|3051941|步骤4:重新启动apache，完成！|3051942|entityMap|0|LINK|mutability|MUTABLE|url|https://pecl.php.net/package/mcrypt/1.0.3/windows^0|0|I|1D|0|0|0|X|O|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@$D|12|E|13|J|K]]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

My Environment: Windows 10, Xampp Control Panel v3.2.4, PHP 7.3.2

Step-1: Download a suitable version for your system from here: <a href="https://pecl.php.net/package/mcrypt/1.0.3/windows" rel="nofollow noreferrer">https://pecl.php.net/package/mcrypt/1.0.3/windows</a>

Step-2: Unzip and copy php_mcrypt.dll file to ../xampp/php/ext/ 

Step-3: Open ../xampp/php/php.ini file and add a line <code>extension=php_mcrypt.dll</code>

Step-4: Restart apache, DONE!

blocks|key|3265624|text|在Ubuntu+18.04中，对于php7.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3265625|$+sudo+apt-get+install+php7.0-mcrypt

$+sudo+systemctl+reload+apache2|code-block|syntax|javascript|3265626|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Ubuntu 18.04, and for php7.0

<pre><code>$ sudo apt-get install php7.0-mcrypt

$ sudo systemctl reload apache2
</code></pre>

blocks|key|314311|text|用于基于Linux的(Fedora)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314312|yum+-y+install+php-mcrypt|code-block|syntax|javascript|314313|通过向PHP.ini添加：'extension=mcrypt.so‘来启用该模块。(/etc/php.ini)|314314|systemctl+restart+httpd.service|314315|完成了！|314316|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

for Linux based (Fedora)

<pre><code>yum -y install php-mcrypt
</code></pre>

Enable the module by adding: 'extension=mcrypt.so' to PHP.ini. (/etc/php.ini)

<pre><code>systemctl restart httpd.service
</code></pre>

Done!

blocks|key|311497|text|对我来说，用以下命令卸载mcrypt很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|311498|sudo+apt-get+purge+php5-mcrypt|code-block|syntax|javascript|311499|然后简单地重新安装它：|311500|sudo+apt-get+install+php5-mcrypt|311501|并且不要忘记如上所述重新启动apache。|311502|我不知道为什么在我的情况下(使用配置了php55的虚拟机)会有什么不同，但也许这会对其他人有所帮助。我在xcache等其他模块中也遇到了这个问题……|311503|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For me it helped to uninstall mcrypt with:

<pre><code>sudo apt-get purge php5-mcrypt
</code></pre>

and simply reinstall it:

<pre><code>sudo apt-get install php5-mcrypt
</code></pre>

and dont forget to restart apache as described above.

Dont know why and how this was different in my case (using a vm with provisioned php55), but maybe this will help someone else. I also had this problem with some other modules like xcache...

blocks|key|3051625|text|检查并安装php5-mcrypt：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3051626|sudo+apt-get+install+php5-mcrypt|code-block|syntax|javascript|3051627|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Check and install php5-mcrypt:

<pre><code>sudo apt-get install php5-mcrypt
</code></pre>

NOTE: The libraries MCrypt support depend on have not been updated in years and MCrypt should no longer be considered a viable or secure method of encrypting data. What's more, MCrypt has been deprecated in PHP 5, and removed entirely in PHP 7. If you have any code that runs MCrypt you should refactor it to use a more modern encryption library. 

<hr>

Does anyone know why this error message: <code>(Call to undefined function mcrypt_encrypt() )</code> displays when I run the following code below?

Am I missing some steps perhaps any setting in PHP I have to do before this code can work?

<pre class="lang-php prettyprint-override"><code>$key = 'password to (en/de)crypt';
$string = 'string to be encrypted';

$test = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key),
 $string, MCRYPT_MODE_CBC, md5(md5($key)));
</code></pre>

Fatal error: Call to undefined function mcrypt_encrypt()

数据加密

Linux Mint

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注意： MCrypt支持所依赖的库已经多年没有更新了，MCrypt不再被认为是一种可行的或安全的数据加密方法。更重要的是，MCrypt在PHP5中已经被弃用，并且在PHP7中被完全删除。如果你有任何运行MCrypt的代码，你应该重构它以使用更现代的加密库。有人知道为什么当我运行下面的代码时会显示这个错误消息：(Call to undefined function mcrypt_encrypt() 

问致命错误:调用未定义的函数mcrypt_encrypt()
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