How Ticks Work
Ticks work via the conjunction of two different mechanisms—a special type of control block called a declare block and the register_tick_function() function. The declare block allows zero or more expressions to be grouped together, while register_tick_function() allows the developer to set a tick function. The tick function will be called once for every one or more expressions within the declare block.
Declare Blocks
Declare blocks use a structure similar to other control blocks (such as while or for). The block has an initialization block, followed by a body section.
The initialization block (enclosed in parentheses) can contain special declare directives.As of PHP 4.0.6, only one directive is valid: ticks. Syntax for the ticks ...
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