Introduction to php chmod() function

The

chmod function of php can change the access permissions of files and folders, but when used, a Warning message is displayed, as follows:

Warning: chmod() [function.chmod]: Operation not permitted in /export/myTest/chmodTest.php on line 5

The access permissions of all superior folders of the modified folder were changed to 777. The chmod function did not modify the access permissions of the folder at all. What is the reason? *nix just needs to make all the files in the web root directory owned by the apache running user. Assuming that there is an apache user in the apache group running httpd, then

chown -R apache.apache /path to DocumentRoot/

For win, the iis running user must have all permissions on DocumentRoot.

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chmod() function changes the file mode. Return TRUE if successful, otherwise return FALSE.

Syntax

chmod(file,mode)

##ParametersDescriptionfileRequired. Specifies the documents to be checked. mode

	Optional. Specify new permissions. mode parameter consists of 4 numbers: The first number is always 0 The second number is specified The owner's permissions The second number specifies the permissions of the user group to which the owner belongs The fourth number specifies the permissions of everyone else Permissions Possible values ​​(to set multiple permissions, total the numbers below): 1 - Execute permissions 2 - Write permission 4 - Read permission

php chmod() function example

<?php
// 所有者可读写，其他人没有任何权限
chmod("test.txt",0600);

// 所有者可读写，其他人可读
chmod("test.txt",0644);

// 所有者有所有权限，其他所有人可读和执行
chmod("test.txt",0755);

// 所有者有所有权限，所有者所在的组可读
chmod("test.txt",0740);
?>

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