PHP Functions selected php functions The functions are linked to the part of the PHP manual that describes them. oOo most used fclose file_get_contents file_put_contents filesize fopen fread fwrite is_dir mkdir mysqli_close mysqli_data_seek mysqli_free_result mysqli_num_rows mysqli_query mysqli_real_escape_string require trim count date dns_check_record echo error_log error_reporting eval exec exit exp explode fflush file file_exists filetype flock floor flush fmod fseek fsockopen 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_nb_continue ftp_nb_fget ftp_nb_fput ftp_nb_get ftp_nb_put ftp_nlist ftp_pasv ftp_put ftp_pwd ftp_quit ftp_raw ftp_rawlist ftp_rename ftp_rmdir ftp_set_option ftp_site ftp_size ftp_ssl_connect ftp_systype get_headers get_meta_tags getdate gethostbyaddr gethostbyname gethostbynamel getimagesize getlastmod glob gmdate gmmktime header headers_list headers_sent image_type_to_extension image_type_to_mime_type imagealphablending imageantialias imagearc imagechar imagecharup imagecolorallocate imagecolorallocatealpha imagecolorat imagecolorclosest imagecolorclosestalpha imagecolorclosesthwb imagecolordeallocate imagecolorexact imagecolorexactalpha imagecolormatch imagecolorresolve imagecolorresolvealpha imagecolorset imagecolorsforindex imagecolorstotal imagecolortransparent imagecopy imagecopymerge imagecopymergegray imagecopyresampled imagecopyresized imagecreate imagecreatefromgd imagecreatefromgd2 imagecreatefromgd2part imagecreatefromgif imagecreatefromjpeg imagecreatefrompng imagecreatefromstring imagecreatefromwbmp imagecreatefromxbm imagecreatefromxpm imagecreatetruecolor imagedashedline imagedestroy imageellipse imagefill imagefilledarc imagefilledellipse imagefilledpolygon imagefilledrectangle imagefilltoborder imagefilter imagefontheight imagefontwidth imageftbbox imagefttext imagegammacorrect imagegd imagegd2 imagegif imageinterlace imageistruecolor imagejpeg imagelayereffect imageline imageloadfont imagepalettecopy imagepng imagepolygon imagepsbbox imagepscopyfont imagepsencodefont imagepsextendfont imagepsfreefont imagepsloadfont imagepsslantfont imagepstext imagerectangle imagerotate imagesavealpha imagesetbrush imagesetpixel imagesetstyle imagesetthickness imagesettile imagestring imagestringup imagesx imagesy imagetruecolortopalette imagettfbbox imagettftext imagetypes imagewbmp imagexbm implode include include_once is_executable is_file is_numeric is_string is_subclass_of is_uploaded_file is_writable is_writeable isset key krsort ksort link linkinfo list localeconv localtime log mail mailparse_determine_best_xfer_encoding mailparse_msg_create mailparse_msg_extract_part mailparse_msg_extract_part_file mailparse_msg_free mailparse_msg_get_part mailparse_msg_get_part_data mailparse_msg_get_structure mailparse_msg_parse mailparse_msg_parse_file mailparse_rfc822_parse_addresses mailparse_stream_encode mailparse_uudecode_all main max next opendir openlog ord pack parse_ini_file parse_str parse_url passthru pathinfo php_uname phpcredits phpinfo phpversion pi pos pow preg_replace prev print rand range readdir readfile rename require_once reset restore_error_handler restore_exception_handler restore_include_path return rewind rewinddir session_id session_start set_time_limit setcookie setlocale sort sqrt srand strip_tags stripcslashes stripos stripslashes stristr strlen strpos strrchr strrev strripos strrpos strspn strstr strtok strtolower strtotime strtoupper strtr strval substr system time umask usort wordwrap Here is a much longer list of all the documented PHP functions