(PHP 4, PHP 5, PHP 7) Arc cosine float acos ( float $arg ) Returns the arc cosine of arg in radians. acos() is the complementary function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos()' range. Parameters: arg The argument to process Returns: The arc cosine of arg in radians.

(PHP 4, PHP 5, PHP 7) Prepend one or more elements to the beginning of an array int array_unshift ( array &$array, mixed $value1 [, mixed $... ] ) array_unshift() prepends passed elements to the front of the array. Note that the list of elements is prepended as a whole, so that the prepended elements stay in the same order. All numerical array keys will be modified to start counting from zero while literal keys won't be

(PECL kadm5 >= 0.2.3) Flush all changes to the Kerberos database bool kadm5_flush ( resource $handle ) Flush all changes to the Kerberos database, leaving the connection to the Kerberos admin server open. Parameters: handle A KADM5 handle. Returns: Returns TRUE on success or FALSE on failure.

(PHP 5 >= 5.5.0, PHP 7) Generates a PKCS5 v2 PBKDF2 string, defaults to SHA-1 string openssl_pbkdf2 ( string $password, string $salt, int $key_length, int $iterations [, string $digest_algorithm ] ) Parameters: password salt key_length iterations dig

(PECL haru >= 0.0.1) Set the current value of text rising bool HaruPage::setTextRise ( float $rise ) Set the current value of text rising. Parameters: rise Defines the current value of text rising. Returns: Returns TRUE on success. Exception: Throws a HaruException on error.

(PECL ev >= 0.2.0) Configures the watcher public void EvTimer::set ( double $after , double $repeat ) Configures the watcher Parameters: after Configures the timer to trigger after after seconds. repeat If repeat is 0.0 , then it will automatically be stopped once the timeout is reached. If it is positive, then the timer will autom

(PECL cairo >= 0.1.0) The setAntialias purpose public void CairoFontOptions::setAntialias ( string $antialias ) Object oriented style (method): Procedural style: void cairo_set_antialias ( CairoContext $context [, string $antialias ] ) Description here. Parameters: context Description... antialias Description...

(PHP 4 <= 4.1.0, PECL dbplus >= 0.9) Remove tuple and return new current tuple int dbplus_tremove ( resource $relation, array $tuple [, array &$current ] ) dbplus_tremove() removes tuple from relation if it perfectly matches a tuple within the relation. current, if given, will contain the data of the new current tuple after calling dbplus_tremove(). Parameters: relation

(PHP 5, PHP 7) Checks if a subclass public bool ReflectionClass::isSubclassOf ( string $class ) Checks if the class is a subclass of a specified class or implements a specified interface. Parameters: class The class name being checked against. Returns: Returns TRUE on success or FALSE on failure.

(PECL OAuth >= 0.99.8) Set CA path and info public mixed OAuth::setCAPath ([ string $ca_path [, string $ca_info ]] ) Sets the Certificate Authority (CA), both for path and info. Parameters: ca_path The CA Path being set. ca_info The CA Info being set. Returns: Returns TRUE on success, or FALSE if either ca_p