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PHP Functions

Function: spl_classes

(PHP 5)

spl_classes --  Return available SPL classes

Description

array spl_classes ( void )

This function returns an array with the current available SPL classes.

Example 1. spl_classes() example 

<?php

print_r(spl_classes());

?>

The above example will output something similar to:

Array
(
    [ArrayObject] => ArrayObject
    [ArrayIterator] => ArrayIterator
    [CachingIterator] => CachingIterator
    [CachingRecursiveIterator] => CachingRecursiveIterator
    [DirectoryIterator] => DirectoryIterator
    [FilterIterator] => FilterIterator
    [LimitIterator] => LimitIterator
    [ParentIterator] => ParentIterator
    [RecursiveDirectoryIterator] => RecursiveDirectoryIterator
    [RecursiveIterator] => RecursiveIterator
    [RecursiveIteratorIterator] => RecursiveIteratorIterator
    [SeekableIterator] => SeekableIterator
    [SimpleXMLIterator] => SimpleXMLIterator
)

CXXVII. SQLite Functions

Introduction

This is an extension for the SQLite Embeddable SQL Database Engine. SQLite is a C library that implements an embeddable SQL database engine. Programs that link with the SQLite library can have SQL database access without running a separate RDBMS process.

SQLite is not a client library used to connect to a big database server. SQLite is the server. The SQLite library reads and writes directly to and from the database files on disk.

Note: For further information see the SQLite Website ( http://sqlite.org/ ).

Installation

Read the INSTALL file, which comes with the package. Or just use the PEAR installer with "pear install sqlite". SQLite itself is already included, You do not need to install any additional software.

Windows users may download the DLL version of the SQLite extension here: ( php_sqlite.dll ).

In PHP 5, the SQLite extension and the engine itself are bundled and compiled by default.

Windows installation for unprivileged accounts: On Windows operating systems, unprivileged accounts don't have the TMP environment variable set by default. This will make sqlite create temporary files in the windows directory, which is not desirable. So, you should set the TMP environment variable for the web server or the user account the web server is running under. If Apache is your web server, you can accomplish this via a SetEnv directive in your httpd.conf file. For example: 

SetEnv TMP c:/temp

If you are unable to establish this setting at the server level, you can implement the setting in your script: 

putenv('TMP=C:/temp');

The setting must refer to a directory that the web server has permission to create files in and subsequently write to and delete the files it created. Otherwise, you may receive the following error message: malformed database schema - unable to open a temporary database file for storing temporary tables

Requirements

In order to have these functions available, you must compile PHP with SQLite support, or load the SQLite extension dynamically from your php.ini .

Resource Types

There are two resources used in the SQLite Interface. The first one is the database connection, the second one the result set.

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

The functions sqlite_fetch_array() and sqlite_current() use a constant for the different types of result arrays. The following constants are defined:

SQLite result type constants

SQLITE_ASSOC ( int )

Columns are returned into the array having the field name as the array index.

SQLITE_BOTH ( int )

Columns are returned into the array having both a numerical index and the field name as the array index.

SQLITE_NUM ( int )

Columns are returned into the array having a numerical index to the fields. This index starts with 0, the first field in the result.

A number of functions may return status codes. The following constants are defined:

SQLite status code constants

SQLITE_OK ( int )

Successful result.

SQLITE_ERROR ( int )

SQL error or missing database.

SQLITE_INTERNAL ( int )

An internal logic error in SQLite.

SQLITE_PERM ( int )

Access permission denied.

SQLITE_ABORT ( int )

Callback routine requested an abort.

SQLITE_BUSY ( int )

The database file is locked.

SQLITE_LOCKED ( int )

A table in the database is locked.

SQLITE_NOMEM ( int )

Memory allocation failed.

SQLITE_READONLY ( int )

Attempt to write a readonly database.

SQLITE_INTERRUPT ( int )

Operation terminated internally.

SQLITE_IOERR ( int )

Disk I/O error occurred.

SQLITE_CORRUPT ( int )

The database disk image is malformed.

SQLITE_NOTFOUND ( int )

(Internal) Table or record not found.

SQLITE_FULL ( int )

Insertion failed because database is full.

SQLITE_CANTOPEN ( int )

Unable to open the database file.

SQLITE_PROTOCOL ( int )

Database lock protocol error.

SQLITE_EMPTY ( int )

(Internal) Database table is empty.

SQLITE_SCHEMA ( int )

The database schema changed.

SQLITE_TOOBIG ( int )

Too much data for one row of a table.

SQLITE_CONSTRAINT ( int )

Abort due to constraint violation.

SQLITE_MISMATCH ( int )

Data type mismatch.

SQLITE_MISUSE ( int )

Library used incorrectly.

SQLITE_NOLFS ( int )

Uses of OS features not supported on host.

SQLITE_AUTH ( int )

Authorized failed.

SQLITE_ROW ( int )

Internal process has another row ready.

SQLITE_DONE ( int )

Internal process has finished executing.

Predefined Classes

SQLiteDatabase

Represents an opened SQLite database.

Constructor

__construct - construct a new SQLiteDatabase object

Methods

query - Execute a query

queryExec - Execute a result-less query

arrayQuery - Execute a query and return the result as an array

singleQuery - Execute a query and return either an array for one single column or the value of the first row

unbufferedQuery - Execute an unbuffered query

lastInsertRowid - Returns the rowid of the most recently inserted row

changes - Returns the number of rows changed by the most recent statement

createAggregate - Register an aggregating UDF for use in SQL statements

createFunction - Register a UDF for use in SQL statements

busyTimeout - Sets or disables busy timeout duration

lastErorr - Returns the last error code of the most recently encountered error

fetchColumnTypes - Return an array of column types from a particular table

SQLiteResult

Represents a buffered SQLite result set.

Methods

fetch - Fetches the next row from the result set as an array

fetchObject - Fetches the next row from the result set as an object

fetchSingle - Fetches the first column from the result set as a string

fetchAll - Fetches all rows from the result set as an array of arrays

column - Fetches a column from the current row of the result set

numFields - Returns the number of fields in the result set

fieldName - Returns the name of a particular field in the result set

current - Fetches the current row from the result set as an array

key - Return the current row index

next - Seek to the next row number

valid - Returns whether more rows are available

rewind - Seek to the first row number of the result set

prev - Seek to the previous row number of the result set

hasPrev - Returns whether or not a previous row is available

numRows - Returns the number of rows in the result set

seek - Seek to a particular row number

SQLiteUnbuffered

Represents an unbuffered SQLite result set. Unbuffered results sets are sequential, forward-seeking only.

Methods

fetch - Fetches the next row from the result set as an array

fetchObject - Fetches the next row from the result set as an object

fetchSingle - Fetches the first column from the result set as a string

fetchAll - Fetches all rows from the result set as an array of arrays

column - Fetches a column from the current row of the result set

numFields - Returns the number of fields in the result set

fieldName - Returns the name of a particular field in the result set

current - Fetches the current row from the result set as an array

next - Seek to the next row number

valid - Returns whether more rows are available

Runtime Configuration

The behaviour of these functions is affected by settings in php.ini .

Table 1. SQLite Configure Options

Name Default Changeable Changelog sqlite.assoc_case "0" PHP_INI_ALL Available since PHP 5.0.0. For further details and definitions of the PHP_INI_* constants, see the Appendix H .

Here's a short explanation of the configuration directives.

sqlite.assoc_case int

Whether to use mixed case ( 0 ), upper case ( 1 ) or lower case ( 2 ) hash indexes.

This option is primarily useful when you need compatibility with other database systems, where the names of the columns are always returned as uppercase or lowercase, regardless of the case of the actual field names in the database schema.

The SQLite library returns the column names in their natural case (that matches the case you used in your schema). When sqlite.assoc_case is set to 0 the natural case will be preserved. When it is set to 1 or 2 , PHP will apply case folding on the hash keys to upper- or lower-case the keys, respectively.

Use of this option incurs a slight performance penalty, but is MUCH faster than performing the case folding yourself using PHP script.

Table of Contents sqlite_array_query  -- Execute a query against a given database and returns an array sqlite_busy_timeout  -- Set busy timeout duration, or disable busy handlers sqlite_changes  --  Returns the number of rows that were changed by the most recent SQL statement sqlite_close  -- Closes an open SQLite database sqlite_column  -- Fetches a column from the current row of a result set sqlite_create_aggregate  -- Register an aggregating UDF for use in SQL statements sqlite_create_function  --  Registers a "regular" User Defined Function for use in SQL statements sqlite_current  -- Fetches the current row from a result set as an array sqlite_error_string  -- Returns the textual description of an error code sqlite_escape_string  -- Escapes a string for use as a query parameter sqlite_exec  -- Executes a result-less query against a given database sqlite_factory  -- Opens a SQLite database and returns a SQLiteDatabase object sqlite_fetch_all  -- Fetches all rows from a result set as an array of arrays sqlite_fetch_array  -- Fetches the next row from a result set as an array sqlite_fetch_column_types  --  Return an array of column types from a particular table sqlite_fetch_object  -- Fetches the next row from a result set as an object sqlite_fetch_single  -- Fetches the first column of a result set as a string sqlite_fetch_string  -- Alias of sqlite_fetch_single() sqlite_field_name  -- Returns the name of a particular field sqlite_has_more  -- Finds whether or not more rows are available sqlite_has_prev  -- Returns whether or not a previous row is available sqlite_key  -- Returns the current row index sqlite_last_error  -- Returns the error code of the last error for a database sqlite_last_insert_rowid  -- Returns the rowid of the most recently inserted row sqlite_libencoding  -- Returns the encoding of the linked SQLite library sqlite_libversion  -- Returns the version of the linked SQLite library sqlite_next  -- Seek to the next row number sqlite_num_fields  -- Returns the number of fields in a result set sqlite_num_rows  -- Returns the number of rows in a buffered result set sqlite_open  -- Opens a SQLite database and create the database if it does not exist sqlite_popen  --  Opens a persistent handle to an SQLite database and create the database if it does not exist sqlite_prev  -- Seek to the previous row number of a result set sqlite_query  -- Executes a query against a given database and returns a result handle sqlite_rewind  -- Seek to the first row number sqlite_seek  -- Seek to a particular row number of a buffered result set sqlite_single_query  --  Executes a query and returns either an array for one single column or the value of the first row sqlite_udf_decode_binary  -- Decode binary data passed as parameters to an UDF sqlite_udf_encode_binary  -- Encode binary data before returning it from an UDF sqlite_unbuffered_query  -- Execute a query that does not prefetch and buffer all data sqlite_valid  -- Returns whether more rows are available

Related Function(s)

  • sqlite_fetch_array()
  • sqlite_current()
  • sqlite_open()
  • sqlite_query()
  • sqlite_exec()
  • sqlite_array_query()
  • sqlite_single_query()
  • sqlite_unbuffered_query()
  • sqlite_last_insert_rowid()
  • sqlite_changes()
  • sqlite_create_aggregate()
  • sqlite_create_function()
  • sqlite_busy_timeout()
  • sqlite_last_error()
  • sqlite_fetch_column_types()
  • sqlite_fetch_object()
  • sqlite_fetch_single()
  • sqlite_fetch_all()
  • sqlite_column()
  • sqlite_num_fields()
  • sqlite_field_name()
  • sqlite_key()
  • sqlite_next()
  • sqlite_valid()
  • sqlite_rewind()
  • sqlite_prev()
  • sqlite_has_prev()
  • sqlite_num_rows()
  • sqlite_seek()
  • sqlite_close()
  • sqlite_error_string()
  • sqlite_escape_string()
  • sqlite_factory()
  • sqlite_fetch_string()
  • sqlite_has_more()
  • sqlite_libencoding()
  • sqlite_libversion()
  • sqlite_popen()
  • sqlite_udf_decode_binary()
  • sqlite_udf_encode_binary()
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