Comparing strings

The primary function used to compare strings is strcmp (). As the only 2 parameters it accepts text strings which are to be compared. This function returns 0 if the strings are the same, value greater than zero if the first string is greater than the second value or less than zero if the first string is less than the second. This function is case characters.

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Regular Expressions

PHP supports 2 types of regular expressions: POSIX and those used in Perl. Regular expressions are strings that can be adapted to various other strings. This can be compared to the so-called. wildcardów used for file operations, where the asterisk (* ‚) substitute for any number of any characters or expression *. *’ will match files with any name and any extension.ir-leasing.ru

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Sessions

Session mechanism allows the passing of parameters between pages easily. The variables are stored on the server side and the client kept only the session ID browse around this website. This ID is stored in a cookie or passed through the URL. PHP is able to identify himself or the client computer is turned on cookie mechanism and, if necessary, add a session ID to each URLu and form.

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Cookies

Cookies

It is a method of storing small amounts of data on a computer viewer page (eg. The information about the first and last name or user name on this service). Cookies set by the service are available only for him and are set for some time.
Cookies are transmitted via HTTP headers.

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Upload File

Often there is also a need to transfer a file to the server, for example by adding a photo to the gallery. The file is transferred using the form field type “file”. Please note that the opening tag form must find a parameter ENCTYPE = “multipart / form-data” and the form must be sent using the POST method.

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Forms

Forms

If you have to give some data (eg. To be added to the database), then the only way is to download them from the standard HTML form. In most programming languages ​​use additional libraries to access the data sent from the form. The PHP has been simplified.

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The range of variables

The range of variables

When you use the functions and classes there is a problem range of variables. This problem applies to most programming languages. Variables are usually available only in the range in which they are declared. For a range understand range master (piece of code that does not belong to any function or class), classes and functions.

Example

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Instructions includ, require and readfile

Instructions include, require and readfile

There are two instructions that allow you to switch to the code contents of another file also contains PHP code. Both of these instructions is given one parameter – the name of the file to include in the code (it can be the path to a file located on another web server). The difference between them is how to enable these files to the code. For instructions “require” the files are attached to the code before parsing, in every place where there is an instruction “require”.

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Classes

Classes

The object has its own properties and can do with it different things. Class is not an object, but its definition (eg. The class is a dog, but not the specific copy). The class definition contains variables (object properties) and function (what you can do with these objects). By using such a convention programming time can be easier to describe the interactions between objects. Here's how to define a sample class and examples of actions on it. Example <?php // Start the class definition Basket - defining basket shop class Cart

Functions

Functions

The function is a piece of code that can be called using the name. We have already been given several functions provided by PHP, such as array (), each (), list (), explode () and implode (). Features recognized by the parentheses occurring after their name. In these brackets (if required) is given parameters for the function. Some functions

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