One line of code in php to get the file suffix_PHP tutorial

One line of code in php to get the file suffix name

The method of one line of code in php to get the file suffix name requires a combination of many functions. Ours is a bit like the function in asp. Let’s take a look below.

Example:

The code is as follows

代码如下
$filename = 'D:/wamp/www/sparkphp/rar'; $rs = strtolower(trim(substr(strrchr($filename, ”.“), 1)));

$filename = 'D:/wamp/www/sparkphp/rar';

$rs = strtolower(trim(substr(strrchr($filename, ”.“), 1)));

Detailed explanation:

The strrchr() function finds the last occurrence of a string in another string and returns all characters from that position to the end of the string;
The substr() function returns a part of the string, 1 means reading from the first subscript of the string. Until the end;

The trim() function removes spaces before and after a string;

The strtolower() function converts a string to lowercase.

代码如下

//方法一: function extend_1($file_name) { $retval=""; $pt=strrpos($file_name, "."); if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt); return ($retval); } //方法二 function extend_2($file_name) { $extend = pathinfo($file_name); $extend = strtolower($extend["extension"]); return $extend; } //方法三 function extend_3($file_name) { $extend =explode("." , $file_name); $va=count($extend)-1; return $extend[$va]; } ?>

Supplement other methods

The code is as follows

//Method 1: 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 function extend_2($file_name) { $extend = pathinfo($file_name); $extend = strtolower($extend["extension"]); return $extend; } //Method 3 function extend_3($file_name)<🎜> {<🎜> $extend =explode("." , $file_name);<🎜> $va=count($extend)-1;<🎜> return $extend[$va];<🎜> }<🎜> ?>

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