PHP Get file name suffix example summary_PHP tutorial-PHP Tutorial-php.cn

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)