What is the Declare Construct in PHP?

[Rob Dizzle]

Hi friends,
I have recently started with the programming language PHP. Before that I have completed C, C++ and Core Java. I have also done HTML and basics of JavaScript. I want to know about the declare construct. I have used others but I don't know much about the declare. So thought that you guys can explain me properly (as usual). Please tell what is the Declare Construct in PHP.?? Any other information related would be grateful.!

[Praetor]

The declare construct is used to set execution directives for a block of code. Also can be defined as the element of declarative language used to add instructions executed in a block of code. The syntax of declare is similar to the syntax of other flow control :

declare (directive)
    statement 

The directive section allows the behavior of the declare block to be set.

[absolute55]

The directive section allows the behavior of the declare block. Currently, only two directives are recognized: the ticks directive and Directive encoding encoding. The encoding directive was added in PHP 5.3.0. The term orders declare block will be executed. How it will be enforced and what effects this will have depends on the directive set in the directive block. The declare construct can also be used in the global context.

[Zecho]

Tick : A tick is an event that occurs for every N low-level tickables executed by the parser within the declare block. The value of N is specified by the syntax ticks= N within the declare blocks's directive. An event that occurs at each tick are specified using the register_tick_function (). All orders are tickables. Typically, the condition expressions and expressions of arguments are not tickables.

[opaper]

I an providing you an example of the Tick usage. You can understand when to use the tick after looking to the following example :

<?php
 
declare(ticks=1);

function tick_handler()
{
    echo "tick_handler() called\n";
}
 
register_tick_function('tick_handler');
 
$a = 1;
 
if ($a > 0) {
    $a += 2;
    print($a);
}
 
?>

[Viensterrr]

The encoding of a script can be specified by script using the encoding directive. The following example demonstrates how to declare an encoding for the script :

<?php
declare(encoding='ISO-8859-1');
.....
// code here
.....
?>