PHP Common functions

pathinfo () functionDefinition and usage

The PathInfo () function returns information about the file path in the form of an array.

The returned array elements are as follows:

• [DirName]
• [BaseName]
• [Extension]

Http://www.runoob.com/php/func-filesystem-pathinfo.html

basename () function

Http://www.runoob.com/php/func-filesystem-basename.html

The basename () function returns the file name portion of the path.

Instance

1<?PHP2 $path= "/testweb/home.php";3 4 //Show filename with file extension5 Echo basename($path) ." <br/> ";6 7 //Show filename without file extension8 Echo basename($path, ". PHP");9?>

The above code will output:

home.php
Home

filesize () functionDefinition and usage

The FileSize () function returns the size of the specified file.

If successful, the function returns the number of bytes in the file size. If it fails, it returns FALSE.

Grammar

filesize(filename)

Http://www.runoob.com/php/func-filesystem-filesize.html

Php_eol

Line break

UNIX series with \ n

Windows series with \ r \ n

Mac with \ r

PHP can be replaced with Php_eol to improve code-level portability

1 <? PHP 2     Echo Php_eol ; 3     // the Windows platform is equivalent to    echo "\ r \ n"; 4     //unix\linux platform equivalent to    echo "\ n"; 5     //mac platform equivalent to    echo "\ r";

get_defined_constants()返回所有常量数组

Similar to what is commonly used

Directory_separator

You can use the function get_defined_constants () to get all the PHP constants

1 <? PHP 2     Print_r (get_defined_constants()); // get_defined_constants () returns all constant arrays

PHP Common functions