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PHP Tutorial 19 - Constants in PHP language | PHP Constants Tutorial=====Follow the link for next video:PHP Tutorial 20 - Want to learn more about what makes the web run? PHP is a programming language used for server-side web development. If this doesn't make sense to you, or if you still aren't quite sure what PHP programming is for, keep reading to learn mor The Social Security Administration (SSA) compiles a list of the most popular baby names over the past 100 years. This represents perhaps the most complete picture of the most common names in the United States. The following list includes bo An web application called GTD-PHP has been released. It is a Getting Things Done (GTD) personal organization system, web based and written in PHP and Founder of Lifehack Read full profile An web application called GTD-PHP has been released.

This means that the following will not work: A constant name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. If you have defined a constant, it can never be changed or undefined. To define a constant you have to use define () function and to retrieve the value of a constant, you have to simply specifying its name. I'm assuming you would like to get the name of the constant based on the value of your variable (value of variable == value of constant). Get all the constants defined in the class, loop over them and compare the values of those constants with the value of your variable. A lot of notes here concern defining the __DIR__ magic constant for PHP versions not supporting the feature. Of course you can define this magic constant for PHP versions not yet having this constant, but it will defeat its purpose as soon as you are using the constant in an included file, which may be in a different directory then the file defining the __DIR__ constant.

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In many A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across Forgetting to use a $ symbol at the start of a variable name.

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PHP constants can be defined by 2 ways: Using define () function Use Constants for values that remain fixed and referenced multiple times.

Case sensitivity is an optional parameter. Constants are case-sensitive. A constant name must start with letter(a-z or A-Z) or underscore(_) followed by any number of letters, numbers or underscores. Constant name cannot start with numbers.
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Returns an array of constant name => constant value array, optionally groupped by extension name registering the constant. A constant is a name for a value (but it's NOT a variable), that usually will be replaced in the code while it gets COMPILED and NOT at runtime. So returned values from functions can't be used, because they will return a value only at runtime.

You can define values in your config file using the names of your defined constants, e.g. in your php code: define ("MY_CONST",999); in you config file: my = MY_CONST. When reading the file do this: $my = constant ($value); // where $value is the string "MY_CONST". now $my holds the value of 999.
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function get_user_types() { global $db; // Get one row from usertypes table and extract field names. $query Constant. Konstant.

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Constant name cannot start with numbers. The scope of constant is global means you can access constants anywhere in script. Syntax to create php constant: Following is a general syntax to 2015-05-17 · PHP Constants. A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name).

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Constants Tutorial in PHP - A constant is a name or an identifier for a simple value.

Constant are same like variables except that one they are defined, they cannot be undefined or modified (except the magic constants). Refer PHP manual for more information on predefined variables. Constants. As name describes, constants hold values that don’t get changed during the runtime of a script.