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Let's notice, that similarity with скриптами on CGI no. The file not to be obliged by feasible or marked any other image. It is a simply usual file HTML, in which there is a set special тегов, doing(making) it is a lot of interesting. This program is extremely simple, and for creation of a so simple page even it is unessential to use PHP. All that she does(makes) is deduces " Hi! With use of function PHP echo (). If at you this example does not display anything or deduces a window of loading, or if you see all this file in a text kind, it is rather probable, that your Web-server has no support PHP. Ask your manager of a server to switch on such support. Offer him the instruction on installation - section "Installation" of the given documentation. If you want to develop скрипты on PHP at home, to you in section necessary files. The houses can be developed скрипты with use of any operational system, but you need to establish the appropriate Web-server. The purpose of an example - to show a format special тегов PHP. In this example we used . Thus it is possible as much as necessary time to pass to a code PHP in a file HTML. Pair of words about the text editors: There is a set of the text editors and integrated environments(Wednesdays) of development (IDE), in which you can create and edit files PHP. The list of some editors contains in section " the List of the editors PHP ". If you want to recommend any editor, visit the given page and ask to add the given editor in the list. Pair of words about word-processors: the word-processors (StarOffice Writer, Microsoft Word, Abiword etc.) in most cases do not approach for editing files PHP. If you use a word-processor for creation скриптов on PHP, you should be sure, that save a file, as ONLY TEXT. Otherwise PHP can not process and execute your program. Pair of words about "Notebook" Windows: At a spelling скриптов PHP with use of built - in "Notebook" Windows it is necessary to save files with expansion .php. "Notebook" automatically adds expansion .txt. For detour of this problem there are some methods. It is possible to place the name of a file in inverted commas (example: "hello.php"). Besides it is possible to choose " All files " instead of " the Text documents " from ниспадающего of the list with types of files in a window of preservation. After that it is possible to enter a name of a file without inverted commas. Job with the forms One of mainest advantages PHP -, how he works with the forms HTML. Here basic is that each element of the form becomes automatically accessible to your programs on PHP. For the detailed information on use of the forms in PHP read section " Variable of external sources ". An example of the form HTML: Example 2-6. The elementary form HTML < form action = "action.php" method = "POST" > Your name: < input type = "text" name = "name" / > Your age: < input type = "text" name = "age" / > < input type = "submit" > In this form there is nothing especial. It is the usual form HTML without any special тегов. When the user will fill in the form and will press the button of sending, the page action.php will be called. In this file can be something like: Example 2-7. We deduce(remove) given of our forms Hello, . To you of years. Example of a conclusion of the given program: Hello, Сергей. To you 30 years. The principle of job of the given code is simple and be clear. Variable The $ _POST ["name"] and $ _POST ["age"] automatically are established for you by means PHP. Earlier we used variable $ _SERVER, here we precisely also use superglobal variable $ _POST, which contains all POST-given. Let's notice, that a method of sending of our form - POST. If we used a method GET, the information of our form would be in superglobal variable $ _GET. Also it is possible to use variable $ _REQUEST, if the source of the data has no meaning(importance). This variable contains a mix of the data GET, POST, COOKIE and FILE. Also we advise to look at the description of function import_request_variables (). Use of the old programs with the new versions PHP Now PHP is popular language of the scripts (скриптов). Becomes ever more and more distributed slices of a code, which you can use in скриптах. In most cases developers PHP tried to save compatibility with the previous versions so, that a code written for older version will be ideal to work and with the new versions of language without any changes. However happens so, that the changes all the same are necessary. There are two important changes, which influence the old programs: The announcement of files $HTTP_ * _ VARS out-of-date. These files required(demanded) глобализации in functions and procedures. The new superglobal files were entered, since PHP 4.1.0. It: $ _GET, $ _POST, $ _COOKIE, $ _SERVER, $ _ENV, $ _REQUEST, and $ _SESSION. Older files $HTTP_ * _ VARS, such, as $HTTP_POST_VARS, exist from times PHP 3 and, probably, will still long exist for preservation of compatibility. External variable any more глобализуются by default. In other words, the instruction register_globals in php.ini by default is switched - off ("off"), since PHP 4.2.0. A recommended method of access to such variable - superglobal files described above. Older programs, book and the managements(manual) can consider(count), that the given instruction is switched on ("on"). For example, variable $id can act from a line URL http: // www.example.com/foo.php? id=42. When the specified instruction is switched off, $id is accessible only as $ _GET ['id']. For the additional information concerning to changes connected with variable, look section " Predetermined variable " and reference of this unit. The chapter 10. Bases of syntax The contents Insert in HTML Division of the instructions Comment Insert in HTML When PHP processes a file, he simply passes his(its) text, one of special тегов yet will not meet which informs him necessity to begin interpretation of the text as code PHP. Then he carries out all found code up to closing тега, speaking to the interpreter, that further again there is simply text. This mechanism allows you to introduce a PHP-code in HTML - all outside тегов PHP remains constant, whereas inside - is interpreted as a code. There are four sets тегов, which can be used for a designation of a PHP-code. From them only two ( and < script language = "php" >... < /script >) are always accessible; others can be switched on or are switched off in a configuration file php.ini. Though short теги and теги in style ASP they can be convenient, not so переносимы, as the long versions. Besides if you intend to insert a PHP-code in XML or XHTML to correspond(meet) XML, you should use the form . Теги, supported PHP: Example 10-1. Ways of an insert in HTML 1. 2. It is a synonym for " " 3. < script language = "php" > echo (" some editors (for example, FrontPage) not Like the instructions of processing "); 4. < of % echo (" you can on a choice use теги in style ASP "); % > < % = $variable; * Is a synonym for " < of % echo... " Of % > The first way, , most preferable, as he allows to use PHP in a code appropriate to rules XML, such as XHTML. The second way is not always accessible. Short теги are accessible only when they are switched on. It can be made, using function short_tags () (only in PHP 3), having switched on installation short_open_tag in a configuration file PHP, or скомпилировав PHP with parameter - enable-short-tags for configure. Even if it is switched on by default in php.ini-dist, use short тегов is not recommended. The fourth way is accessible only if теги in style ASP were switched on, using configuration installation asp_tags. The remark: the support тегов in style ASP was added in the version 3.0.4. The remark: It is necessary to avoid use short тегов by development of the applications or libraries intended for distribution or accommodation on PHP-servers, not taking place under your control, as short теги can not be supported on a target server. For creation переносимого, compatible code, do not use short теги. Closing тег of the block of a PHP-code includes at once translation, following it,(him,) of a line, if he is present. Besides closing тег automatically means a point from a point; you do not need to finish last line of a code in the block by a point from a point. Closing тег of the PHP-block at the end of a file is not obligatory. PHP allows to use such structures: an example 10-2. A professional insert It is true. It ложь. This code works how it is expected, because when PHP meets closing теги? >, he simply deduces everything, that he finds up to the following opening тега. The given here example certainly thought up, but for a conclusion of the large blocks of the text an output(exit) from a mode of interpretation PHP is usually more effective, than sending of the text through echo (), print () or something similar. Comment PHP supports комметарии in style 'C', ' C ++ ' and environment Unix. For example: The one-lower case comments go only up to the end of a line or current block of a PHP-code, that goes before them.

It an example.

the Heading above will deduce(remove) ' It is an example '. Be close(attentive), watch(keep up) absence enclosed ' C of the '-comments, they can appear during commenting the large blocks. The one-lower case comments go only up to the end of a line or current block of a PHP-code, that goes before them. It means, what a HTML-code after //? > will be printed:? > deduces from a mode PHP and returns in a mode HTML, but // does not allow it to make. If the configuration instruction asp_tags is switched on, same occurs and at // of % >. The chapter 11. Types The contents Introduction Булев Whole Numbers with a floating point Lines Files Objects Resource NULL Pseudo-types(pseudo-!as) used in this documentation Manipulations with types Introduction PHP supports eight simple types. Four scalar types: boolean integer float (number with a floating point or 'double') string Two mixed types: array object And, at last, two special types: resource NULL For convenience of understanding in this management(manual) is used also a little pseudo-typical: mixed number callback You also can find some mentions such as double accuracy. Consider(examine) it(him) as number with a floating point two a name exist only for the historical reasons. As a rule, the programmer does not establish a type variable; it is more preferable, that it did(made) PHP during performance of the program depending on a context, in which is used variable. The remark: If you wish to check up a type and meaning(importance) of the certain expression, use var_dump (). The remark: If for debugging it is necessary simply удобочитаемое representation of a type, use gettype (). To check up on the certain type, do not use gettype (), apply for this purpose is_type of function. Some examples: If you want under duress to change a type variable, you can either result variable, or use function settype (). Pay attention, that variable, depending on her(it) such as at the given moment, in the certain situations can have different meanings(importance). More detailed information look in section of Manipulation with types. Also to you, probably, it will be interesting to see the tables of comparison of types, as in them the examples of the connected comparisons of various types are given. Булев It is the elementary type. He expresses the validity of meaning(importance) is can be either TRUE, or FALSE. The remark: Булев the type was entered in PHP 4. Syntax To define(determine) булев a type, use a key word TRUE or FALSE. Both регистро-independent. Usually you use a certain operator, which returns logic expression, and then betrays of his(its) managing design. \n "; } //... Because you can simply write if ($show_separators) { echo "