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- array_unique()
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- array_values()
- array_walk()
- array_walk_recursive()
- arsort()
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- compact()
- count()
- current()
- each()
- end()
- extract()
- in_array()
- key()
- krsort()
- ksort()
- list()
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- next()
- pos()
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- PHP Calendar
- cal_days_in_month()
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- gregoriantojd()
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- PHP Date
- checkdate()
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- date_offset_get()
- date_parse_from_format()
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- date_sun_info()
- date_sunrise()
- date_sunset()
- date_time_set()
- date_timestamp_get()
- date_timestamp_set()
- date_timezone_get()
- date_timezone_set()
- date()
- getdate()
- gettimeofday()
- gmdate()
- gmmktime()
- gmstrftime()
- idate()
- localtime()
- microtime()
- mktime()
- strftime()
- strptime()
- strtotime()
- time()
- timezone_abbreviations_list()
- timezone_identifiers_list()
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- timezone_name_get()
- timezone_offset_get()
- timezone_open()
- timezone_transitions_get()
- timezone_version_get()
- PHP Directory
- chdir()
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- closedir()
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- scandir()
- PHP Error
- debug_backtrace()
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- getFile()
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- getLine()
- getPrevious()
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- PHP Filesystem
- basename()
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- clearstatcache()
- copy()
- delete()
- dirname()
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- fclose()
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- fgetc()
- fgetcsv()
- fgets()
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- file()
- file_exists()
- file_get_contents()
- file_put_contents()
- fileatime()
- filectime()
- filegroup()
- fileinode()
- filemtime()
- fileowner()
- fileperms()
- filesize()
- filetype()
- flock()
- fnmatch()
- fopen()
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- fstat()
- ftell()
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- fwrite()
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- lchgrp()
- lchown()
- link()
- linkinfo()
- lstat()
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- PHP Filter
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- filter_input_array()
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- PHP FTP
- ftp_alloc()
- ftp_cdup()
- ftp_chdir()
- ftp_chmod()
- ftp_close()
- ftp_connect()
- ftp_delete()
- ftp_exec()
- ftp_fget()
- ftp_fput()
- ftp_get()
- ftp_get_option()
- ftp_login()
- ftp_mdtm()
- ftp_mkdir()
- ftp_mlsd()
- ftp_nb_continue()
- ftp_nb_fget()
- ftp_nb_fput()
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- ftp_nlist()
- ftp_pasv()
- ftp_put()
- ftp_pwd()
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- ftp_rawlist()
- ftp_rename()
- ftp_rmdir()
- ftp_set_option()
- ftp_site()
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- ftp_ssl_connect()
- ftp_systype()
- PHP JSON
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- PHP Keywords
- abstract
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- clone
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- continue
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- default
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- echo
- else
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- empty
- enddeclare
- endfor
- endforeach
- endif
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- for
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- implements
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- interface
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- namespace
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- return
- static
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- try
- use
- var
- while
- xor
- yield
- yield from
- PHP Libxml
- libxml_clear_errors()
- libxml_disable_entity_loader()
- libxml_get_errors()
- libxml_get_last_error()
- libxml_set_external_entity_loader()
- libxml_set_streams_context()
- libxml_use_internal_errors()
- PHP Mail
- ezmlm_hash()
- mail()
- PHP Math
- abs()
- acos()
- acosh()
- asin()
- asinh()
- atan()
- atan2()
- atanh()
- base_convert()
- bindec()
- ceil()
- cos()
- cosh()
- decbin()
- dechex()
- decoct()
- deg2rad()
- exp()
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- floor()
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- getrandmax()
- hexdec()
- hypot()
- intdiv()
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- is_nan()
- lcg_value()
- log()
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- max()
- min()
- mt_getrandmax()
- mt_rand()
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- octdec()
- pi()
- pow()
- rad2deg()
- rand()
- round()
- sin()
- sinh()
- sqrt()
- srand()
- tan()
- tanh()
- PHP Misc
- connection_aborted()
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- connection_timeout()
- constant()
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- __halt_compiler()
- highlight_file()
- highlight_string()
- hrtime()
- ignore_user_abort()
- pack()
- php_strip_whitespace()
- show_source()
- sleep()
- sys_getloadavg()
- time_nanosleep()
- time_sleep_until()
- uniqid()
- unpack()
- usleep()
- PHP MySQLi
- affected_rows
- autocommit
- change_user
- character_set_name
- close
- commit
- connect
- connect_errno
- connect_error
- data_seek
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- error
- error_list
- fetch_all
- fetch_array
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- fetch_field
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- fetch_fields
- fetch_lengths
- fetch_object
- fetch_row
- field_count
- field_seek
- get_charset
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- get_client_stats
- get_client_version
- get_connection_stats
- get_host_info
- get_proto_info
- get_server_info
- get_server_version
- info
- init
- insert_id
- kill
- more_results
- multi_query
- next_result
- options
- ping
- poll
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- query
- real_connect
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- real_query
- reap_async_query
- refresh
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- select_db
- set_charset
- set_local_infile_handler
- sqlstate
- ssl_set
- stat
- stmt_init
- thread_id
- thread_safe
- use_result
- warning_count
- PHP Network
- checkdnsrr()
- closelog()
- dns_check_record()
- dns_get_mx()
- dns_get_record()
- fsockopen()
- gethostbyaddr()
- gethostbyname()
- gethostbynamel()
- gethostname()
- getmxrr()
- getprotobyname()
- getprotobynumber()
- getservbyname()
- getservbyport()
- header_register_callback()
- header_remove()
- header()
- headers_list()
- headers_sent()
- http_response_code()
- inet_ntop()
- inet_pton()
- ip2long()
- long2ip()
- openlog()
- pfsockopen()
- setcookie()
- setrawcookie()
- socket_get_status()
- socket_set_blocking()
- socket_set_timeout()
- syslog()
- PHP Output Control
- flush()
- ob_clean()
- ob_end_clean()
- ob_end_flush()
- ob_flush()
- ob_get_clean()
- ob_get_contents()
- ob_get_flush()
- ob_get_length()
- ob_get_level()
- ob_gzhandler()
- ob_implicit_flush()
- ob_list_handlers()
- ob_start()
- output_add_rewrite_var()
- output_reset_rewrite_vars()
- PHP RegEx
- preg_filter()
- preg_grep()
- preg_last_error()
- preg_match()
- preg_match_all()
- preg_replace
- preg_replace_callback
- preg_replace_callback_array
- preg_split
- preg_quote
- PHP SimpleXML
- __construct()
- __tostring()
- addAttribute()
- addChild()
- asXML()
- attributes()
- children()
- count()
- getDocNamespaces()
- getName()
- getNamespaces()
- registerXPathNamespace()
- saveXML()
- simplexml_import_dom()
- simplexml_load_file()
- simplexml_load_string()
- xpath()
- current()
- getchildren()
- haschildren()
- key()
- next()
- rewind()
- valid()
- PHP Stream
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- addcslashes()
- addslashes()
- bin2hex()
- chop()
- chr()
- chunk_split()
- convert_cyr_string()
- convert_uudecode()
- convert_uuencode()
- count_chars()
- crc32()
- crypt()
- echo()
- explode()
- fprint()
- get_html_translation_table()
- hebrev()
- hebrevc()
- hex2bin()
- html_entity_decode()
- htmlentities()
- htmlspecialchars_decode()
- htmlspecialchars()
- implode()
- join()
- lcfirst()
- levenshtein()
- localeconv()
- ltrim()
- md5()
- md5_file()
- metaphone()
- money_format()
- nl_langinfo()
- nl2br()
- number_format()
- ord()
- parse_str()
- print()
- printf()
- quoted_printable_decode()
- quoted_printable_encode()
- quotemeta()
- rtrim()
- setlocale()
- sha1()
- sha1_file()
- similar_text()
- soundex()
- sprintf()
- sscanf()
- str_getcsv()
- str_ireplace()
- str_pad()
- str_repeat()
- str_replace()
- str_rot13()
- str_shuffle()
- str_split()
- str_word_count()
- strcasecmp()
- strchr()
- strcmp()
- strcoll()
- strcspn()
- strip_tags()
- stripcslashes()
- stripslashes()
- stripos()
- stristr()
- strlen()
- strnatcasecmp()
- strnatcmp()
- strncasecmp()
- strncmp()
- strpbrk()
- strpos()
- strrchr()
- strrev()
- strripos()
- strrpos()
- strspn()
- strstr()
- strtok()
- strtolower()
- strtoupper()
- strtr()
- substr()
- substr_compare()
- substr_count()
- substr_replace()
- trim()
- ucfirst()
- ucwords()
- vfprintf()
- vprintf()
- vsprintf()
- wordwrap()
- PHP Variable Handling
- boolval()
- debug_zval_dump()
- doubleval()
- is_countable()
- empty()
- floatval()
- get_defined_vars()
- get_resource_type()
- gettype()
- intval()
- is_array()
- is_bool()
- is_callable()
- is_double()
- is_float()
- is_int()
- is_integer()
- is_iterable()
- is_long()
- is_null()
- is_numeric()
- is_object()
- is_real()
- is_resource()
- is_scalar()
- is_string()
- isset()
- print_r()
- serialize()
- settype()
- strval()
- unserialize()
- unset()
- var_dump()
- var_export()
- PHP XML Parser
- utf8_decode()
- utf8_encode()
- xml_error_string()
- xml_get_current_byte_index()
- xml_get_current_column_number()
- xml_get_current_line_number()
- xml_get_error_code()
- xml_parse()
- xml_parse_into_struct()
- xml_parser_create_ns()
- xml_parser_create()
- xml_parser_free()
- xml_parser_get_option()
- xml_parser_set_option()
- xml_set_character_data_handler()
- xml_set_default_handler()
- xml_set_element_handler()
- xml_set_end_namespace_decl_handler()
- xml_set_external_entity_ref_handler()
- xml_set_notation_decl_handler()
- xml_set_object()
- xml_set_processing_instruction_handler()
- xml_set_start_namespace_decl_handler()
- xml_set_unparsed_entity_decl_handler()
- PHP Zip
- zip_close()
- zip_entry_close()
- zip_entry_compressedsize()
- zip_entry_compressionmethod()
- zip_entry_filesize()
- zip_entry_name()
- zip_entry_open()
- zip_entry_read()
- zip_open()
- zip_read()
- PHP Timezones
Example
Use include_once to add a footer to a page:
<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my home
page!</h1>
<p>Some text.</p>
<p>Some more text.</p>
<?php include_once
'footer.php';?>
</body>
</html>
Definition and Usage
The include_once keyword is used to embed PHP code from another file. If the file is
not found, a warning is shown and the program continues to run. If the file was already
included previously, this statement will not include it again.
Related Pages
The include keyword
The require keyword
The require_once keyword
Read more about including files in our PHP Include Files Tutorial.
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