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

Currently only three directives are recognized: As directives are handled as the file is being compiled, only literals may be given as directive values.

Variables and constants cannot be used. 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. A tick is an event that occurs for every N low-level tickable statements executed by the parser within the declare block. Not all statements are tickable. Typically, condition expressions and argument expressions are not tickable. See the example below for more details.

Note that more than one event can occur for each tick. Example 1 Tick usage example. Example 2 Ticks usage example.

A script's encoding can be specified per-script using the encoding directive. Example 3 Declaring an encoding for the script. The encoding declare value is ignored in PHP 5. Note that PHP does not expose whether --enable-zend-multibyte was used to compile PHP other than by phpinfo.

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Edit Report a Bug. Ticks A tick is an event that occurs for every N low-level tickable statements executed by the parser within the declare block.

Encoding A script's encoding can be specified per-script using the encoding directive. It's amazing how many people didn't grasp the concept here. Note the wording in the documentation. It states that the tick handler is called every n native execution cycles.

That means native instructions, not including system calls i'm guessing. This can give you a very good idea if you need to optimize a particular part of your script, since you can measure quite effectively how many native instructions are in your actual code. A good profiler would take that into account, and force you, the developer, to include calls nestle company stock market symbol the profiler as you're entering and leaving every function.

That way you'd be able to keep an eye on how many como operar en forex it took each function to complete.

That is extremely powerful, and not to be underestimated.

SAP Sybase Forums - PowerBuilder - General Discussion - Can't use the OUTPUT option when passing a constant to a stored procedure in PB

A good solution would cannot use the output option in a declare statement aggregate stats, so the total time in a function would be counted, including inside called functions.

In the following example: One may wonder why the opening curly bracket is not tickable if the closing is tickable. This is because the instruction for PHP to start ticking is given by the opening curly bracket so the ticking starts immediately after it. This helper class traces executed statements. Calls it like so: Note that the two methods for calling declare are not identical. I'm assuming this is due to how PHP handles ticking internally. If you misspell the directive, you won't get any error or warning.

The declare block will simply act as a nest for statements: However, keep in mind that: If you set 'zend. As long as you use ASCII compatible encodings i. ISO 5UTF-8 etc for both the file encoding as the zend. However, I have not experimented with adding non-ascii characters in comments above the declare statement. The scope of the declare call if used without a block is a little unpredictable, in my experience.

It appears that if placed in a method or function, it may not apply to the calls that ensue, like the following: At the risk of losing the ability to make a mathematical science out of placing a number of activities at varying durations of ticks like many people have chosen to do, I've found it simple to just put this at the top of the code, and just make it global.

I haven't found this written in the doc: We can specify different encoding to different blocks: They are in fact not executed every second as expected. So this function is not a real alternative for multithreading using some slow functions. Also note that PHP is run in a single thread and so everything it does will be one line of code at a time. I'm not aware of any true threading support in PHP, the closest you can get is to fork.

Correction to above note: Also, after playing around with this, I found that it is not really the multi-tasking I had expected.

sql server - Calling stored procedure with OUTPUT parameter in dynamic SQL - Stack Overflow

It behaves the same as simply calling the functions. They do not run in parallel. It also seems that they always run in the order in which they were registered.