PHP实用代码片段（二）

发布时间：2020-05-25 03:05:13 所属栏目：PHP 来源：互联网

导读：1. 转换 URL：从字符串变成超链接如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。function makeClickableLinks($text){$text = eregi_replace((((f|ht){1}tp://)[-a-z

1. 转换 URL：从字符串变成超链接

如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。

makeClickableLinks( = ('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)','', = ('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)','1', = ('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})','',return $text;
}

语法：

2. 阻止多个 IP 访问你的网站

这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站。

( !('blocked_ips.txt' = '127.0.0.1','192.168.1.1','83.76.27.9','192.168.1.163' = ('blocked_ips.txt' = (['REMOTE_ADDR']) ? (['REMOTE_ADDR']) : ''// search current IP in $deny_ips array
if ( (array_search($ip,$deny_ips))!== FALSE ) {
// address is blocked:
echo 'Your IP adress ('.$ip.') was blocked!';
exit;
}

3. 强制性文件下载

如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。

force_download( = "../log/exports/" ((())&&((.("Content-type: application/force-download"('Content-Disposition: inline; filename="' . . . '"'("Content-Transfer-Encoding: Binary"("Content-length: ".(.('Content-Type: application/octet-stream'('Content-Disposition: attachment; filename="' . . '"'("" "No file selected"

语法：

<"image.jpg"?>

4. 创建 JSON 数据

使用下面的 PHP 片段可以创建 JSON 数据，可以方便你创建移动应用的 Web 服务。

= ('id'=>1,'name'=>"Mohit" json_encode();

5. 压缩 zip 文件

使用下面的 PHP 片段可以即时压缩 zip 文件。

create_zip( = (), = '', = (() && !) { = (( ( (([] = (( = (->open(, ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== ( ->addFile(,numFiles,' files with a status of ',$zip->status;

    //close the zip -- done!  </span>
    <span style="color: #800080"&gt;$zip</span>-><span style="color: #000000"&gt;close();  

    </span><span style="color: #008000"&gt;//</span><span style="color: #008000"&gt;check to make sure the file exists  </span>
    <span style="color: #0000ff"&gt;return</span> <span style="color: #008080"&gt;file_exists</span>(<span style="color: #800080"&gt;$destination</span><span style="color: #000000"&gt;);  
}  
</span><span style="color: #0000ff"&gt;else</span><span style="color: #000000"&gt;  
{  
    </span><span style="color: #0000ff"&gt;return</span> <span style="color: #0000ff"&gt;false</span><span style="color: #000000"&gt;;  
}

}

语法：

6. 解压文件

unzip(,(("unzip ",(( = 1;< ();++ = (("~inflating: ~","",[(.'/'.,.'/'.(.'/'.

语法：

7. 缩放图片

resize_image(,,, = (".", = [()-1

</span><span style="color: #0000ff"&gt;if</span>(<span style="color: #800080"&gt;$ext</span> == "jpg" || <span style="color: #800080"&gt;$ext</span> == "jpeg"<span style="color: #000000"&gt;)  
    </span><span style="color: #800080"&gt;$im</span> = imagecreatefromjpeg(<span style="color: #800080"&gt;$tmpname</span><span style="color: #000000"&gt;);  
</span><span style="color: #0000ff"&gt;elseif</span>(<span style="color: #800080"&gt;$ext</span> == "png"<span style="color: #000000"&gt;)  
    </span><span style="color: #800080"&gt;$im</span> = imagecreatefrompng(<span style="color: #800080"&gt;$tmpname</span><span style="color: #000000"&gt;);  
</span><span style="color: #0000ff"&gt;elseif</span>(<span style="color: #800080"&gt;$ext</span> == "gif"<span style="color: #000000"&gt;)  
    </span><span style="color: #800080"&gt;$im</span> = imagecreatefromgif(<span style="color: #800080"&gt;$tmpname</span><span style="color: #000000"&gt;);  

</span><span style="color: #800080"&gt;$x</span> = imagesx(<span style="color: #800080"&gt;$im</span><span style="color: #000000"&gt;);  
</span><span style="color: #800080"&gt;$y</span> = imagesy(<span style="color: #800080"&gt;$im</span><span style="color: #000000"&gt;);  

</span><span style="color: #0000ff"&gt;if</span>(<span style="color: #800080"&gt;$x</span> <= <span style="color: #800080"&gt;$xmax</span> &amp;&amp; <span style="color: #800080"&gt;$y</span> <= <span style="color: #800080"&gt;$ymax</span><span style="color: #000000"&gt;)  
    </span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$im</span><span style="color: #000000"&gt;;  

</span><span style="color: #0000ff"&gt;if</span>(<span style="color: #800080"&gt;$x</span> >= <span style="color: #800080"&gt;$y</span><span style="color: #000000"&gt;) {  
    </span><span style="color: #800080"&gt;$newx</span> = <span style="color: #800080"&gt;$xmax</span><span style="color: #000000"&gt;;  
    </span><span style="color: #800080"&gt;$newy</span> = <span style="color: #800080"&gt;$newx</span> * <span style="color: #800080"&gt;$y</span> / <span style="color: #800080"&gt;$x</span><span style="color: #000000"&gt;;  
}  
</span><span style="color: #0000ff"&gt;else</span><span style="color: #000000"&gt; {  
    </span><span style="color: #800080"&gt;$newy</span> = <span style="color: #800080"&gt;$ymax</span><span style="color: #000000"&gt;;  
    </span><span style="color: #800080"&gt;$newx</span> = <span style="color: #800080"&gt;$x</span> / <span style="color: #800080"&gt;$y</span> * <span style="color: #800080"&gt;$newy</span><span style="color: #000000"&gt;;  
}  

</span><span style="color: #800080"&gt;$im2</span> = imagecreatetruecolor(<span style="color: #800080"&gt;$newx</span>,<span style="color: #800080"&gt;$newy</span><span style="color: #000000"&gt;);  
imagecopyresized(</span><span style="color: #800080"&gt;$im2</span>,<span style="color: #800080"&gt;$im</span>,<span style="color: #008080"&gt;floor</span>(<span style="color: #800080"&gt;$newx</span>),<span style="color: #008080"&gt;floor</span>(<span style="color: #800080"&gt;$newy</span>),<span style="color: #800080"&gt;$x</span>,<span style="color: #800080"&gt;$y</span><span style="color: #000000"&gt;);  
</span><span style="color: #0000ff"&gt;return</span> <span style="color: #800080"&gt;$im2</span><span style="color: #000000"&gt;;

}

8. 使用 mail() 发送邮件

send_mail(,, = "From: KOONKrn" .= "Reply-To: blog@koonk.comrn" .= "Return-Path: blog@koonk.comrn" .= "X-Mailer: PHP5n" .= 'MIME-Version: 1.0' . "n" .= 'Content-type: text/html; charset=iso-8859-1' . "rn"(,,

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