PHP Get file name suffix example summary_PHP tutorial

When uploading PHP files, we need to obtain the file name suffix and then make a simple file type judgment. The method of obtaining the file name suffix in PHP is very simple and there are many ways. Let me summarize it below.

1.basename()-returns the file name of the path

Please see the php code below:

The code is as follows

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代码如下	复制代码
$path = "/usr/www/html/index.php"; echo basename($path)." "; //如果选择suffix则忽略扩展名 echo basename($path,".php"); ?>

$path = "/usr/www/html/index.php";
echo basename($path)."
";
//If suffix is ​​selected, the extension is ignored
echo basename($path,".php");
?>

代码如下	复制代码
//——FILE__返回文件完整路径 $dir = dirname(__FILE__); echo $dir; ?>

Running result:

index.php
index

2.dirname()-returns the file path of the current script!

php code:

The code is as follows

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//——FILE__ returns the full path of the file

$dir = dirname(__FILE__);

代码如下	复制代码
$path = "/usr/www/html/index.php"; $pathinfo = pathinfo($path); echo "目录名称：$pathinfo[dirname] "; echo "文件名称：$pathinfo[basename] "; echo "扩展名：$pathinfo[extension]"; ?>

echo $dir;

?>

Run result:
F:webzendexercise

3.pathinfo() returns an associative array containing path information.

Includes the following array elements: path name dirname, file name basename and extension name extension.

代码如下	复制代码
$path = "./exercise/php.txt"; $realpath = realpath($path); echo $realpath; ?>

Please see the simple code demonstration below:

The code is as follows

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$path = "/usr/www/html/index.php";
$pathinfo = pathinfo($path);

echo "Directory name: $pathinfo[dirname]
";

代码如下	复制代码
function extend_1($file_name) { $retval=“”; $pt=strrpos($file_name, “.”); if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt); return ($retval); }

echo "File name: $pathinfo[basename]
"; echo "Extension: $pathinfo[extension]"; ?>

Run result: Directory name: /usr/www/html File name: index.php Extension: php 4.realpath -- Returns the normalized absolute path name The php code is as follows:

The code is as follows	Copy code
$path = "./exercise/php.txt";<🎜> $realpath = realpath($path);<🎜> echo $realpath;<🎜> ?>

Finally, pay attention to a little tip: the file path operators of different paths may be different. You can use "/" and "" under Windows, Under Linux, you can only use "/", so when developing, it is recommended to use "/", as I wrote the file path above! //Method 1:<🎜>

The code is as follows	Copy code
function extend_1($file_name) <🎜> { <🎜> $retval=""; <🎜> $pt=strrpos($file_name, “.”); <🎜> if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt); <🎜> return ($retval); <🎜> }

//Method 2
Php code

Php code

The code is as follows

代码如下	复制代码
function extend_2($file_name) { $extend = pathinfo($file_name); $extend = strtolower($extend["extension"]); return $extend; }

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function extend_2($file_name)
{

$extend = pathinfo($file_name);

代码如下	复制代码
function extend_3($file_name) { $extend =explode(“.” , $file_name); $va=count($extend)-1; return $extend[$va]; }

$extend = strtolower($extend["extension"]);

return $extend;
}

代码如下	复制代码
function getFileExt($file_name) { while($dot = strpos($file_name, “.”)) { $file_name = substr($file_name, $dot+1); } return $file_name; }

//Method 3

The code is as follows

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function extend_3($file_name)

{ $extend =explode(“.” , $file_name); $va=count($extend)-1; return $extend[$va]; } //Method 4 Php code

The code is as follows

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function getFileExt($file_name) { while($dot = strpos($file_name, “.”)) { <🎜> $file_name = substr($file_name, $dot+1); <🎜> } <🎜> return $file_name; <🎜> } <🎜> <🎜> <🎜> <🎜> <🎜>?> http://www.bkjia.com/PHPjc/633058.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/633058.htmlTechArticleWhen uploading php files, we need to obtain the file name suffix and then make a simple file type judgment, and in php files There are many ways to obtain a name suffix. Let me summarize it below... Statement： The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn Previous article：PHP writes array to file example code_PHP tutorialNext article：PHP writes array to file example code_PHP tutorial Related articles See more How to use cURL to implement Get and Post requests in PHP How to use cURL to implement Get and Post requests in PHP How to use cURL to implement Get and Post requests in PHP How to use cURL to implement Get and Post requests in PHP All expression symbols in regular expressions (summary) Public welfare online PHP training，Help PHP learners grow quickly！ About usDisclaimerSitemap © php.cn All rights reserved