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# PHP umask() Function * * Complete PHP Filesystem Reference](#) * * * ## Definition and Usage The umask() function changes the file permissions. This function sets PHP's umask to _mask_ & 0777 and returns the previous umask. However, if you call umask() without arguments, it returns the current umask. ## Syntax umask(mask) | Parameter | Description | | :--- | :--- | | mask | Optional. Specifies the new permissions. Default is 0777. The mask parameter consists of four digits: * The first digit is usually 0 * The second digit specifies permissions for the owner * The third digit specifies permissions for the owner's group * The fourth digit specifies permissions for everyone else Possible values (sum the numbers below to set multiple permissions): * 1 = execute permission * 2 = write permission * 4 = read permission | * * Complete PHP Filesystem Reference](#)