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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.
PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.
(PHP 3, PHP 4, PHP 5)
mysql_error -- Returns the text of the error message from previous MySQL operationReturns the error text from the last MySQL function. Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_error() to retrieve the error text. Note that this function only returns the error text from the most recently executed MySQL function (not including mysql_error() and mysql_errno()), so if you want to use it, make sure you check the value before calling another MySQL function.
link_identifierThe MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an E_WARNING level warning is generated.
Returns the error text from the last MySQL function, or '' (empty string) if no error occurred.
Another Useful functions:
ref.pdo-mysql | ref.pdo-mysql.connection | ref.mysqli | ref.mysql | function.mysqli-warning-count | function.mysqli-use-result | function.mysqli-thread-safe | function.mysqli-thread-id | function.mysqli-store-result | function.mysqli-stmt-store-result | function.mysqli-stmt-sqlstate | function.mysqli-stmt-send-long-data | function.mysqli-stmt-result-metadata | function.mysqli-stmt-reset | function.mysqli-stmt-prepare | function.mysqli-stmt-param-count | function.mysqli-stmt-num-rows | function.mysqli-stmt-insert-id | function.mysqli-stmt-init | function.mysqli-stmt-get-warnings | function.mysqli-stmt-free-result | function.mysqli-stmt-field-count | function.mysqli-stmt-fetch | function.mysqli-stmt-execute | function.mysqli-stmt-error | function.mysqli-stmt-errno | function.mysqli-stmt-data-seek | function.mysqli-stmt-close | function.mysqli-stmt-bind-result | function.mysqli-stmt-bind-param | function.mysqli-stmt-attr-set | function.mysqli-stmt-attr-get | function.mysqli-stmt-affected-rows | function.mysqli-stat | function.mysqli-ssl-set | function.mysqli-sqlstate | function.mysqli-slave-query | function.mysqli-set-opt | function.mysqli-set-local-infile-handler | function.mysqli-set-local-infile-default | function.mysqli-set-charset | function.mysqli-server-init | function.mysqli-server-end | function.mysqli-send-query | function.mysqli-send-long-data | function.mysqli-select-db | function.mysqli-rpl-query-type | function.mysqli-rpl-probe | function.mysqli-rpl-parse-enabled | function.mysqli-rollback | function.mysqli-report | function.mysqli-real-query | function.mysqli-real-escape-string | function.mysqli-real-connect | function.mysqli-query | function.mysqli-prepare | function.mysqli-ping | function.mysqli-param-count | function.mysqli-options | function.mysqli-num-rows | function.mysqli-num-fields | function.mysqli-next-result | function.mysqli-multi-query | function.mysqli-more-results | function.mysqli-master-query | function.mysqli-kill | function.mysqli-insert-id | function.mysqli-init | function.mysqli-info | function.mysqli-get-warnings | function.mysqli-get-server-version | function.mysqli-get-server-info | function.mysqli-get-proto-info | function.mysqli-get-metadata | function.mysqli-get-host-info | function.mysqli-get-client-version | function.mysqli-get-client-info | function.mysqli-get-charset | function.mysqli-free-result | function.mysqli-field-tell | function.mysqli-field-seek | function.mysqli-field-count | function.mysqli-fetch | function.mysqli-fetch-row | function.mysqli-fetch-object | function.mysqli-fetch-lengths | function.mysqli-fetch-fields | function.mysqli-fetch-field | function.mysqli-fetch-field-direct | function.mysqli-fetch-assoc | function.mysqli-fetch-array | function.mysqli-execute | function.mysqli-escape-string | function.mysqli-error | function.mysqli-errno | function.mysqli-enable-rpl-parse | function.mysqli-enable-reads-from-master | function.mysqli-embedded-server-start | function.mysqli-embedded-server-end | function.mysqli-dump-debug-info | function.mysqli-disable-rpl-parse | function.mysqli-disable-reads-from-master | function.mysqli-debug | function.mysqli-data-seek | function.mysqli-connect | function.mysqli-connect-error | function.mysqli-connect-errno | function.mysqli-commit | function.mysqli-close | function.mysqli-client-encoding | function.mysqli-character-set-name | function.mysqli-change-user | function.mysqli-bind-result | function.mysqli-bind-param | function.mysqli-autocommit | function.mysqli-affected-rows | function.mysql-unbuffered-query | function.mysql-thread-id | function.mysql-tablename | function.mysql-stat | function.mysql-select-db | function.mysql-result | function.mysql-real-escape-string | function.mysql-query | function.mysql-ping | function.mysql-pconnect | function.mysql-num-rows | function.mysql-num-fields | function.mysql-list-tables | function.mysql-list-processes | function.mysql-list-fields | function.mysql-list-dbs | function.mysql-insert-id | function.mysql-info | function.mysql-get-server-info | function.mysql-get-proto-info | function.mysql-get-host-info | function.mysql-get-client-info | function.mysql-free-result | function.mysql-field-type | function.mysql-field-table | function.mysql-field-seek | function.mysql-field-name | function.mysql-field-len | function.mysql-field-flags | function.mysql-fetch-row | function.mysql-fetch-object | function.mysql-fetch-lengths | function.mysql-fetch-field | function.mysql-fetch-assoc | function.mysql-fetch-array | function.mysql-escape-string | function.mysql-error | function.mysql-errno | function.mysql-drop-db | function.mysql-db-query | function.mysql-db-name | function.mysql-data-seek | function.mysql-create-db | function.mysql-connect | function.mysql-close | function.mysql-client-encoding | function.mysql-change-user | function.mysql-affected-rows |
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.