(PHP 5 >= 5.3.11, PHP 7) Registers a PHP function for use as an SQL collating function

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0) Execute an SQL statement and return the number of affected

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.1) Fetches the first column of a result set as a string

(PECL mongo >=1.3.0) Gets an array of names for all collections in this database

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Test if a field is SQL NULL

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Escape a string for query

(PECL tokyo_tyrant >= 0.1.0) Concatenates to a record

(PHP 5, PHP 7) Binds variables to a prepared statement as parameters

(PECL mongo >=1.0.1) Log in to this database

(PHP 5, PHP 7, PECL OCI8 >= 1.1.0) Copies large object