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PHP simply implements relative path conversion to absolute path

王林
Release: 2023-02-28 16:56:01
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PHP simply implements relative path conversion to absolute path

函数介绍:

realpath() 函数返回绝对路径。该函数删除所有符号连接(比如 '/./', '/../' 以及多余的 '/'),返回绝对路径名。若失败,则返回 false。比如说文件不存在的话。

is_dir() 函数检查指定的文件是否是一个目录。如果目录存在,该函数返回 TRUE。

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示例如下:

/**
 * 简单方式 start
 */
$rel_path = '../abc/qwe/';//相对路径
 
$rel_path = iconv('UTF-8', 'GBK', $rel_path);//使用iconv转换中文编码,防止乱码
if (!is_dir($rel_path)){
	mkdir($rel_path,0777,true);
}
$abs_path = realpath($rel_path) . '/';//转换成绝对路径
echo $abs_path;
echo &#39;<hr>&#39;;
 
/* 删除带盘符段的路径 */
 
$new_abs_path = str_replace(&#39;\\&#39;,&#39;/&#39;,$abs_path);
echo $new_abs_path;
echo &#39;<hr>&#39;;
 
$rdl_path =  str_ireplace($_SERVER[&#39;PHP_SELF&#39;],&#39;&#39;,str_replace(&#39;\\&#39;,&#39;/&#39;,__FILE__));
echo $rdl_path;
echo &#39;<hr>&#39;;
 
$file_abs_url = str_replace($rdl_path,"",$new_abs_path);
echo $file_abs_url;
echo &#39;<hr>&#39;;
 
/**
 * 简单方式 end
 */
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另一种方式:

/**
 * 相对路径-转换->绝对路径
 * @param string $RelUrl 相对路径
 * @param string $PrefixUrl 前缀拼接路径
 * @param string $SuffixUrl 后缀拼接路径
 * @return string 返回值
 */
function RelToAbs($RelUrl,$PrefixUrl = &#39;&#39;,$SuffixUrl = &#39;&#39;){
	$RelUrlRep = str_replace(&#39;\\&#39;,&#39;/&#39;,$RelUrl);
	$UrlArr = explode(&#39;/&#39;,$RelUrlRep);
	$NewUrlArr = array();
	foreach ($UrlArr as $key=>$value){
		if ($value == &#39;..&#39; && !empty($NewUrlArr)){
			array_pop($NewUrlArr);
		}else if ($value != &#39;..&#39; && $value != &#39;.&#39; && $value != &#39;&#39;){ 
		// && $value != &#39;&#39; 防止多重 斜杠(/)
			$NewUrlArr[] = $value;
		}
	}
	$UrlStr = !empty($NewUrlArr) ? implode(&#39;/&#39;,$NewUrlArr) : &#39;/&#39; ;
	return $PrefixUrl.$UrlStr.$SuffixUrl;
}
$file_abs_path = RelToAbs($rel_path);
print_r($file_abs_path);
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