Ostatnie szukania:
control-structures functions ,
include functions ,
variable functions ,
post functions
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The declare construct is used to set execution directives for a block of code. The syntax of declare is similar to the syntax of other flow control constructs:
declare (directive)
statement
The directive section allows the behavior of the declare block to be set. Currently only two directives are recognized: the ticks directive (See below for more information on the ticks directive) and the encoding directive (See below for more information on the encoding directive).
Informacja: The encoding directive was added in PHP 5.3.0
The statement part of the declare block will be executed - how it is executed and what side effects occur during execution may depend on the directive set in the directive block.
The declare construct can also be used in the global scope, affecting all code following it (however if the file with declare was included then it does not affect the parent file).
<?php
// these are the same:
// you can use this:
declare(ticks=1) {
// entire script here
}
// or you can use this:
declare(ticks=1);
// entire script here
?>
A tick is an event that occurs for every
N low-level tickable statements executed
by the parser within the declare block.
The value for N is specified
using ticks=N
within the declare blocks's
directive section.
Not all statements are tickable. Typically, condition expressions and argument expressions are not tickable.
The event(s) that occur on each tick are specified using the register_tick_function(). See the example below for more details. Note that more than one event can occur for each tick.
Przykład #1 Tick usage example
<?php
declare(ticks=1);
// A function called on each tick event
function tick_handler()
{
echo "tick_handler() called\n";
}
register_tick_function('tick_handler');
$a = 1;
if ($a > 0) {
$a += 2;
print($a);
}
?>
Przykład #2 Ticks usage example
<?php
function tick_handler()
{
echo "tick_handler() called\n";
}
$a = 1;
tick_handler();
if ($a > 0) {
$a += 2;
tick_handler();
print($a);
tick_handler();
}
tick_handler();
?>
See also register_tick_function() and unregister_tick_function().
A script's encoding can be specified per-script using the encoding directive.
Przykład #3 Declaring an encoding for the script.
<?php
declare(encoding='ISO-8859-1');
// code here
?>
When combined with namespaces, the only legal syntax for declare is declare(encoding='...'); where ... is the encoding value. declare(encoding='...') {} will result in a parse error when combined with namespaces.
The encoding declare value is ignored in PHP 5.3 unless php is compiled with --enable-zend-multibyte. In PHP 6.0, the encoding directive will be used to inform the scanner what encoding the file is created in. Legal values are encoding names such as UTF-8.
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mydło z Aleppo