php 创设短地址 (var_export)

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Release: 2016-06-13 10:56:03
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php 创建短地址 (var_export)

提交页面 shorten.php:

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处理页面 show.php:

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<?phpinclude 'functions.php';include 'shorturls.php';$entry = $_POST['submit'];$url = $_POST['url'];$output = '';if($entry == 'Shorten Url' AND $url){	if(!in_array($url,$shortUrls))	{		$uif = alphaID(count($shortUrls),false,6);				if(!array_key_exists($uif,$shortUrls))		{			$shortUrls[$uif] = $url;									$file = fopen('shorturls.php','w'); 			fwrite($file,'<?php $shortUrls = ' . var_export($shortUrls,true) . ';?>');			fclose($file);			$output = 'Original Url : '.$url.'<br> Shorten Ulr : <a href="http://www.yourdomain.com/api/s='.%24uif.'" target="_blank">http://www.yourdomain.com/api/s='.$uif.'</a>';		}		else $output = 'access error';	}	else	{		$uif = array_search($url,$shortUrls);		$output =  'Original Url : '.$url.'<br> Shorten Ulr : <a href="http://www.yourdomain.com/api/s='.%24uif.'" target="_blank">http://www.yourdomain.com/api/s='.$uif.'</a>';	}		echo $output.'<br><br> <a href="shorten.php">Back</a>';}?>
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关联页面?functions.php

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<?php function alphaID($in, $to_num = false, $pad_up = false, $passKey = null){	$index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";	if ($passKey !== null) {		// Although this function's purpose is to just make the		// ID short - and not so much secure,		// with this patch by Simon Franz (http://blog.snaky.org/)		// you can optionally supply a password to make it harder		// to calculate the corresponding numeric ID		for ($n = 0; $n<strlen($index); $n++) $i[] = substr( $index,$n ,1);		$passhash = hash('sha256',$passKey);		$passhash = (strlen($passhash) < strlen($index))			? hash('sha512',$passKey)			: $passhash;		for ($n=0; $n < strlen($index); $n++) $p[] =  substr($passhash, $n ,1);		array_multisort($p,  SORT_DESC, $i);		$index = implode($i);	}	$base  = strlen($index);	if ($to_num) {		// Digital number  <<--  alphabet letter code		$in  = strrev($in);		$out = 0;		$len = strlen($in) - 1;		for ($t = 0; $t <= $len; $t++) {			$bcpow = bcpow($base, $len - $t);			$out   = $out + strpos($index, substr($in, $t, 1)) * $bcpow;		}		if (is_numeric($pad_up)) {			$pad_up--;			if ($pad_up > 0) $out -= pow($base, $pad_up);		}		$out = sprintf('%F', $out);		$out = substr($out, 0, strpos($out, '.'));	} 	else 	{		// Digital number  -->>  alphabet letter code		if (is_numeric($pad_up)) {			$pad_up--;			if ($pad_up > 0) $in += pow($base, $pad_up);		}		$out = "";		for ($t = floor(log($in, $base)); $t >= 0; $t--) {			$bcp = bcpow($base, $t);			$a   = floor($in / $bcp) % $base;			$out = $out . substr($index, $a, 1);			$in  = $in - ($a * $bcp);		}		$out = strrev($out); // reverse	}	return $out;}?>
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关联页面?shorturls.php

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<?php $shortUrls = array ();?>
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原理: 将提交的网址存放数组里面,同时为之产生一个唯一的键,之后将该数组存放文本中,当然你也可以存放到数据库中,此实例为存放到文本中。

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一些函数的解释:

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1. array_search() 函数

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array_search(value,array,strict)

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array_search() 函数与 in_array() 一样,在数组中查找一个键值。如果找到了该值,匹配元素的键名会被返回。如果没找到,则返回 false。

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2.?var_export()?函数

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此函数返回关于传递给该函数的变量的结构信息,它和 var_dump() 类似,不同的是其返回的表示是合法的 PHP 代码。

您可以通过将函数的第二个参数设置为 TRUE,从而返回变量的表示。

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比较 var_export() 和 var_dump().

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最后是 接受页面?redirect.php

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<?phpinclude 'shorturls.php';$uid = $_GET['uid'];$addr = ($uid AND array_key_exists($uid,$shortUrls)) ? $shortUrls[$uid]: '/';header('location:'.$addr);
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此页面需要结合 .htaccess or .waccess 使用

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RewriteEngine On RewriteRule ^s=(.*)$ /redirect.php?uid=$1 [R=301,L]
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关联:

php创建短ID Create short IDs with PHP - Like Youtube or TinyURL?

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如果问题,敬请留言~

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